Find cheap flights from Seattle to London Heathrow Airport

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Find cheap flights from Seattle to London Heathrow Airport

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Good to know - Cheap tickets from Seattle to London Heathrow Airport

Low season

OctoberBest time to beat the crowds (11% less expensive on average)

High season

DecemberMost popular time to fly (31% more expensive on average)

Average price (return flight)

£432(avg. price over the last 2 weeks)

Good deal (return flight)

£369or less

Good deal one-way

£255or less

When to book flights from Seattle to London Heathrow Airport

Estimated return price
Average price per month
Flight prices as travel date approaches

Top tips for finding a cheap flight from Seattle to London Heathrow Airport

  • Looking for a cheap flight from London Heathrow Airport to Seattle? 25% of our users found flights on this route for £255 or less one-way and £369 or less round-trip.
  • The cheapest flight from Seattle to London Heathrow Airport was found, on average, 62 days before departure.
  • Book at least 3 weeks before departure in order to get a below-average price for flights from Seattle to London Heathrow Airport.
  • High season is considered to be November, December, and January. The cheapest month to fly from Seattle to London Heathrow Airport is October.
  • Morning departure is around 18% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking Seattle to London Heathrow Airport flights

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Top 3 airlines serving Seattle/Tacoma Intl to London Heathrow

Scores according to KAYAK customer reviews

7.6
Finnair
Overall score based on 3,621 reviews
7.9
Boarding
7.5
Comfort
8.3
Crew
7.2
Entertainment
7.2
Food
Airline reviews

Pros: "The crew was great!"

Pros: "Speed boarding process."
Cons: "No entertainment system on a 3 hour flight..."

Pros: "Service, staff, food and beverages all excellent"
Cons: "Seat was just a little hard when lying on my side"

Pros: "Everything went smoothly"

Pros: "Arrived ahead of time Crue"
Cons: "Sales on board"

Pros: "The accommodations made me feel like I was in first class!"
Cons: "The screaming child behind me ):"

Pros: "Excellent"

Pros: "I LOVED my stewardist. This man was so incredibly kind to me and the service he gave me had me questioning if it's usually appropriate to tip them. I wish I knew this mans name so I could rave about him but I unfortunately didn't catch it."
Cons: "Let me start out by saying this was my first transcontinental, longer than 2hour flight...I am extremely upset that I paid the extra money to choose my seat and when booking I chose that I wanted a window seat, well I ended up smack in the middle of the plane with a person on each side of me so I wasn't even able to sleep the entire 7 hour 9p-9am flight. Also when I attempted to check in 24hours prior in order to make sure I got a seat id be happy with it said that it wasn't available for my flight so I couldn't check in and I couldn't chose a seat but regardless I still should've gotten the seat I wanted bc of my preferences at booking. Don't pay the extra to ensure your seat it's a total rip off"

Pros: "Breakfast was good"
Cons: "Air conditioning was blasting down on me too powerfully"

Pros: "Nothing!!"

Pros: "the price was very good"

Pros: "Good"
Cons: "Breakfast"

Cons: "Experienced very rude cabin crew"

Pros: "Movies Food Comfortable seating"
Cons: "Going through security"

Pros: "Nice dinner, drinks, and snack services"
Cons: "Could be a little friendlier. Lights on the whole time during a red eye was pretty annoying. Don't know if this was on purpose or a malfunction. Entertainment system was hard to see and a little outdated."

Cons: "No leg room"

Pros: "The energy of the crew was upbeat despite the lock of enertainment they tried their best by accommodating my various wishes."
Cons: "They were no snacks available except the ones that we had to pay for - which in fact I thought was a bit pretentious towards the passengers."

Pros: "It was not Finnair it was all British airways."

Cons: "When I arrived to board my flight I was highly unsatisfied with the excessive charges I received for my luggage that was overweight (only by 7 pounds). I was not only charged an additional $100 for my second checked bag, but I was also charged $200 for the extra weight. As a college student traveling abroad for 6 months, I did not expect to be bombarded with these fees at the beginning of my journey. Due to this experience, I would like to have been notified ahead of time of the expected charges as it made me uneasy before a long flight."

Cons: "BA lost my baggage. The sandwich they offered was uneatable. Marshall Hoffman"

Pros: "Crew, boarding, cleanliness of the plan, and all other aspects other than food were good/excellent."
Cons: "The vegetables in the meal / salad were still frozen….inedible. In the morning in the asian vegetarian meal it was simply fruit…that was it. No protein source. I have been on many BA flights and the food has not been this poor, so not sure if the carrier who services food source has changed."

Cons: "Need wifi to work. Highly dissapointed that BRITISH air doesn't have this feature. Most airlines do!!"

Cons: "There was a very poor selection of movies to watch:( Last tim ei flew AA, and there was an absolutely huge choice . . . Would love to see that improved . . I think you have to cater for all tastes . . . and that definitely was not the case on my flight"

Pros: "I last traveled on British Airways in May of last year (2015) and the food was beyond dreadful. Therefore I was very pleasantly surprised that there has been a huge improvement. They were very generous with the drinks and the food was plentiful and quite a reasonable standard for airline food (they gave two full meals from San Francisco to London, whereas most airlines give one meal and one snack on that route). They actually checked us in on the earlier side, we took off very promptly and got to London early. It was nice to be on time for a change - so often I find airlines run a bit late. Staff were all pleasant and helpful. Pilot's messages were pleasant, friendly and even a bit informative."
Cons: "Web check-in ahead of time was a total disaster. I got an email telling me I could check in 36 hours early and "secure a good seat" but neither of the 2 sets of codes they provided in the email would work because it was all about Finnair but actually the flight was being run by British Airways. I spent about 30 minutes on the 'phone trying to get the appropriate sequence of numbers and letters to enter so as to check in and get a good seat - still nothing worked. This was at 5:45am - I regretted the time spent when I could have gone back to sleep. My daughter later spent a further 90 minutes trying to figure it out, only to be told finally that our only option was to get to the airport early and check n there which was what we did. It was beyond irksome. Please note, if the airline actually flying is different fro the booking airline, the locator number for check n will be DIFFERENT and needs to be provided to the customer to avoid a great deal of hassle and confusion. We gt particularly unlucky because BA computers had a glitch that day but the general point still stands."

Pros: "For once the seats have enough space. Airlines think we are cattle and that they can pack as much as possible every airplane. For once I was glad to have a confortable experience."

Cons: "Our bag was not checked through to our final destination and was delivered a day later."

Pros: "Good leg room."
Cons: "I paid an extra $90 to pick this seat. On the website it looked like an exit row seat with lots of room. However I couldn't really move out of my seat without climbing over others. It was a waste of $90."

Pros: "Nice one"
Cons: "Nice one"

Pros: "easy - no surprises"

Pros: "I have a BA - Gold card- BA lounge was good."
Cons: "Comfort- Plans are Old, Entertainments is Worst. BAD BAD BAD."

Pros: "Head phone jack was not working in my seat."

Pros: "Seats were comfortable with plenty of room."
Cons: "Plane was broken and we had to wait 3 1/2 hours to get a new plane. Crew kept awkwardly mentioning during every announcement that the delay wasn't their fault... My husband's entertainment screen was broken and flickering so much that all shows/films were completely unwatchable. My screen began flickering 1/2way through a film."

Cons: "Trying to get through airport security was an unorganized clown show with them herding groups of passengers back and forth between airport terminals resulting in many people almost missing their flights because the lines just weren't moving. Once on the airplane, the international flight had TVs in the ceiling in the row playing one in-flight movie (what is this 1995?). American is such a terrible airline. The old US airways, Lufthansa, and British Airways, are way better international flights every time I've flown with them. Personal entertainment at your seat for each flight (i thought this was standard on all international flights in the past like 10 years) and more food and drinks throughout the flight."

Pros: "And perfectly on time!"

Pros: "Accuracy Staff Serving"
Cons: "My name was wrongly written on the passanger list."

Cons: "There was a terrible smell; food and drinks were served two hours after the flight started, it was dirty, cold and cramped. The whole experience was traumatising!"

Pros: "Movie selection was excellent."
Cons: "Uncomfortable seats and tight quarters. First class was too expensive."

Cons: "I booked the finnair flight because it was direct and charged $60 for additional bags to check in. For me this was really important since I was moving countries so I needed to check in multiple bags. But since this was in partnership with British Airways, I was charged $90 instead of $30. This was not mentioned or made clear before I made my purchase, if i buy a finnair flight then I should be charged finnair prices on baggage. If not, this should have been made clear before hand so I could have weighed my flight options. I hope you are able to provide a resolution."

Cons: "When I got to Phl I missed my connection to London. No one seemed to care that I needed to be in England by the 18th. They kept retorting me to arrive in England on the 19th. I told them multiple times Id be flexible and go to any city in the UK just for them to get me there on the 18th. The First person I talked to said it was impossible. So I called again and talked to another person and all of a sudden it was possible. The worst part was they sent me to Boston after that I didn't get to Boston until 1:50 am and they did not compensate with hotel or anything while my flight to London was not until 8:00 am the next morning. So I spent the night in the airport. Oh and then when I finally got to London, my bag is lost and they told me I'd have it by tomorrow and I still do not have my bag and have called and they said they can't tell me anything."

Pros: "First time across the Atlantic, and the British/French crew was the most polite crew ever."

Pros: "Nothing"
Cons: "Cramped, cold,"

Pros: "Seats are snug. You get to know your neighbors really well."

Pros: "Nothing"
Cons: "If I had known when I made the reservation it was American airline would have never booked a ticket plane was dirty food terrible the whole plane needed a update"

Pros: "direct flight"
Cons: "There was a lack of air and no possibility for individual airing your seat, during our flight we had to stand in the back because we were almost passing out of overheating 30 Celsius plus heat in our row. We asked for a cooler temperature and only the last 20 minutes it started cooling but then to ice cold. My audio was not working properly, at max it was still unclear. We have had better flight experiences."

Cons: "Seats on the Dreamliner seemed cramped and too close together."

Pros: "On time departures. Good service"

Pros: "Nothing"
Cons: "Tiny seats. Wouldn't let me pay for an upgrade. Last time I ever use kayak"

Pros: "Great flight"
Cons: "N/A"

Pros: "Nice new plane"
Cons: "Seats too narrow"

Pros: "Good experience overall, no issues at all"

Pros: "They were good to my two year old daughter"

Pros: "Really comfortable plane"
Cons: "Slow boarding"

Cons: "When booking I was certain I booked checked luggage, when I got there it wasn't included, I never received a proper receipt. Boarding was delayed fit 40mins and not communicated"

Cons: "Very limited food choice."

Cons: "The pillow and blanket I was given had hairs from other people. It was obvious they were reusedanfnot cleaned"

Pros: "The attendants were nice and the plane was clean. I arrived safely."
Cons: "I haven't flown for over a decade. The general flight was fine, but to my dismay I discovered that the airlines had squeezed an extra seat into each row. They should be ashamed of themselves. We are not animals and airplanes are not cattle cars. At least they didn't used to be. ☹"

Pros: "The blanket and pillow"

Cons: "Seat uncomfortable"

Pros: "Nothing"
Cons: "It was a very uncomfortable flight as there was a box under the seat in front of seat 26E so I could not get comfortable and I’m only 5’7”. As it’s in the middle of the plane they we were the last row to be served"

Cons: "I was charged for baggage FLYUS confirmation did not clearly explain about the charge before I booked the flight. Not good!"

Pros: "Smooth flight."
Cons: "Delayed departure. Icelandair did not hold its KEF to LGW flight for passengers."

Pros: "Blankets and pillows at each seat"
Cons: "Only one drink service on a very long flight. very expensive food choices."

Cons: "It took hanging on a customer service line for just shy of an hour to get rebooked on the next day’s flights to Copenhagen Also they charged me $95 one-way for a single checked bag. That wasn’t clear at all when I booked my flight and will stop me from using your website again"

Pros: "Nothing"
Cons: "Bad on everything"

Cons: "It was very cold in the cabin."

Cons: "See above."

Pros: "Stopover at Rejyavik and the Icelandic cultural experience on board"

Pros: "And super uncomfortably tight seating. Thank goodness for sleeping pills"

Pros: "See Above"
Cons: "See Above"

Pros: "I really want to thank the gate staff in Seattle for helping me retrieve my laptop from security in time to board the plane with it. They didn't have to do that and it was a huge help to me."

Pros: "Excellent service. Everyone was very friendly!"

Cons: "There is little room to store stuff....headphones, charfers, toiletry kit, etc."

Cons: "Landing was terrible ."

Cons: "3 hour delay. Missed connection"

Pros: "Crews"
Cons: "Too hot inside"

Cons: "Included in previous comment"

Pros: "Scenery"
Cons: "Small seat crammed with my neighbor"

Cons: "Would like more movie options"

Pros: "The Aurora lights on the overhead compartments was a pleasant touch."

Pros: "We really loved the price and the service was fine. Having the stopover in Iceland on our way to England was a treat and the schedule was fine."
Cons: "Bugged me that they charged for a meal on an intercontinental flight."

Pros: "Crew were polite, though they didn't hand pillows and blankets out to everyone. I declined a blanket, since I had one from the first flight, but was never offered a pillow, which I would have accepted. The style of this plane provided a ton of head space, which was really nice."
Cons: "The seats were really uncomfortable for such a long flight. Also, the entertainment system was having trouble for half the flight before they finally fixed it."

Pros: "My seat was actually not too uncomfortable. I had travelled on Iceland air a few years ago and thought the seats were pretty tight and uncomfortable. This was better."
Cons: "Minimal beverages. Must bring your own snacks as they are only for purchase."

Cons: "I could not mov, the legroom was nonexistent, heavy people in front of me."

Pros: "Loved the Saga Lounge - that was a great treat for us, as we were unaware that it was available to comfort economy passengers until we were informed at check in."

Pros: "Peaceful and smooth until the landing."
Cons: "Landing quite rough."

Pros: "We boarded on time and the plane was clean."
Cons: "We were told we had to check our carry on, which they said was too big, yet others with much larger didn't. The flight attendants were not friendly and we were past up numerous times when they were seeing & collection trash. Half way to our destination two of the three bathrooms were no longer functioning."

Cons: "Arrived 10 hours late, lost luggage."

Pros: "The crew was quick and kept us informed; the iPads were a pleasant surprise and a nice addition to a flight"
Cons: "No communication with passengers regarding delayed boarding and absolutely NO announcements to board. Everyone lined up and just waited until they started letting us through, so it didn't even matter what seat you got, it all depended on how close you were to the front of the line. Completely ridiculous. Keflavik Airport was too congested with no consideration given to pedestrian traffic while trying to board an entire plane. Massive jams."

Cons: "Our suitcases got lost"

Pros: "The people that work for Iceland Air were very friendly and helpful. Our trip to Reykjavik and onto Paris was great. We would fly with Iceland Air again."

Cons: "Armrest that can't go up when with a child"

Cons: "Terribly uncomfortable seat, and it's always a bummer to have to pay for food on a long international flight"

Pros: "Seats were comfortable with plenty of leg room and the flight was smooth and pleasant."

Pros: "The staff were extremely nice and helpful as I was traveling with bridal dress and the suit of the groom, and, seating in economy class, I was worried about stuffing these items in the overhead compartment. The airline staff helped me store these items in a closet without hesitation; and even checked back in with me upon landing to ensure that I wouldn't forget them while exiting the aircraft."
Cons: "Seat has very little cushion, it didn't take long for my lower back and butt to start hurting. A more comfortable seat would go a long way towards helping one forget they are on a transatlantic flight."

Pros: "For economy class the leg room was actually decent."
Cons: "On every other international flight I have flown on meals and drinks are included. Kind of ridiculous you paid for these things individually on the flight b"

Cons: "The change in Keflavik was unnecessarily confused and lacked clarity."

Pros: "Check in and boarding experience were erfect."
Cons: "Seats throughout majority of aircraft (I.e., Economy section) are flattened from overuse, so they are hard and uncomfortable."

Cons: "Seats are very uncomfortable for long flight ."

Cons: "Time to upgrade your planes, Alaska Airlines!"

Cons: "When you book BA and end up with Iberia, that’s definitely not what you want..."

Cons: "Missed my transfer in London because the plane took too long to unboard and I was unable to make it to the gates of my next flight in time, despite there being over an hour connection time. The flight came in slightly late and passports were re-inspected upon unboarding which wasted a lot of time, and Heathrow is a nightmare of an airport on a good day, which made it very difficult to get where I needed to go."

Cons: "This flight was cancelled"

Pros: "The aircraft comfort"
Cons: "Do the checking before not 15 min before the departure"

Cons: "Delayed by an hour due to inbound delay, causing a knock-on delay with plane maintenance. While fairly comfortably seated and offered water, this still was somewhat unpleasant especially after a long-haul from Havana"

Pros: "Not a lot."
Cons: "Arriving at the gate whilst the flight was still boarding, with a boarding pass in my hand, and being told that my seat had been given to someone else because the Airline unilaterally decided that my connecting flight from Bogotá would not arrive in time. Followed by two hours of Iberia staff being surly, not looking me in they eye and doing absolutely nothing about getting me home. I have now been travelling for nearly 30 hours without sleep, am stuck in Madrid with no certainty of when or how I will get home or see my luggage again, and am seriously seriously pissed off. I do accept that things can sometimes go wrong and that it is nobody’s fault. This is definitely somebody’s fault."

Pros: "Every thing was ok"
Cons: "N/A"

Pros: "The food was nice."
Cons: "There was no water in business class toilets. The staff are not polite."

Cons: "I was not able to check in online"

Pros: "The screens on a dozen seats just failed a few hours in - engineering issue. And breakfast was a cold pretzel. Food gets let’s generous on BA all the time. The crew were lovely."
Cons: "A 2330 Flight ran significantly late with a passenger delay and then de-icing. The repeated assurances of “a 10 minute or so delay” were obviously not correct. Takeoff close to 0100 was followed by drinks AND then food - my vote would be neither. Please oh please just let us sleep."

Pros: "Madrid's airport is comfortable and modern."
Cons: "Unless you paid you do not even get a seat assigned until you get to the airport. No food or even drink unless you pay."

Pros: "Excellent service"

Cons: "Seating and not so friendly"

Pros: "Heathrow Airport has a lot of stores to keep you occupied"
Cons: "Late notice of where our gate was located. By the time we got the news, we went to our gate and the people were already boarding"

Pros: "Crew was nice and I had a great flight with Iberia on my flight from Chicago to Madrid"
Cons: "I am 6 feet 180 pounds and I had absolutely no legroom was completely stuck in my seat can’t believe that a tourist class seat is this small with no legroom"

Pros: "Airbus 320"
Cons: "Boarding process and pitiful legroom space . Iberia clearly loves showing the privileged few who have paid top dollars to be at the front , that we must be made to wait and struggle to get to our seats .Then, we have to squeeze into a tiny , pitiful space of a seat .....Even Ryanair does better !"

Pros: "seat is comfort"

Pros: "Flight was safe, aircraft was clean and luckily with enough room under the seat to store carry on bag"
Cons: "The fact that all the passengers boarding in "group 3" were forced to check in their carry-on bags if they did not fit under the seat; and retrieve those at the baggage claim area (not right after exiting the airplane) In my case I was able to store my carryon under the seat in front of me after pleading to the crew and gate members to let me try because of my connecting flights. There is no complimentary food service, even water is charged."

Cons: "I stopped at the Iberia check-in at Barajas in Madrid. They sent me to BA check-in, where I waited 45 minutes to find out that I should be at Iberia check-in. Then, Iberia check-in had to send me to last minute clerk or I would have missed my flight. Last minute check-in ended up being the same place and same clerk I began with."

Cons: "A porter checked our bags at the gate without asking us whether we were traveling beyond London, so the bags were never transferred to the transatlantic flight nor did they arrive in SF. It wasn't necessary to check them because there was plenty of room in the overhead bins when we got on the flight. We immediately asked a flight attendant to help when I realized they might not go through and he said he spoke to someone who caught and tagged the bags to go through, but it still didn't happen. It would have been easier if he had just brought them to us on the plane. Another women's bag was taken with all her baby supplies and bottles in it for a 16-hour travel day. Very frustrating for all of us."

Cons: "Mistake Kayak or its subcontractor made in listing the name of my wife incorrectly. This created a real hassle in getting a boarding pass in her name"

Pros: "short flight, on time"
Cons: "indifferent crew"

Pros: "The flight was short"
Cons: "They didn't even give out water on the flight. Not to happy with the service"

Cons: "There was no complimentary water or beverages"

Cons: "Very pleased with overall service and hospitality"

Pros: "Flight on time"
Cons: "Check in was terrible, did no allow online and on the desk a lot of misinformation which sent me to different desks for check in. Personnel Needs training!!l"

Pros: "Nothing stood out."
Cons: "Late. Ineffective boarding - announcement said we would board by row, but actual boarding was by mass crowding, with no attempt by crew to improve matters. No recognition of dwindling baggage storage space meant that I had to cram my suitcase under the seat, and spend the 2.5 hour flight with my legs jammed against it."

Cons: "Upon boarding the aircraft was really hot, I was sweating in my seat... I did not receive any complementary drinks or snacks."

Pros: "Movies, no delays"
Cons: "Luggage was not documented correctly to my final destination by Iberia"

Cons: "Very limited room to move. Rather impersonal"

Pros: "Comfortable flights & on time"
Cons: "Service, flight crew seemed to busy chatting instead of serving."

Pros: "Nothing"
Cons: "They forced us to check our bags at the gate even though we had an international connection to make in London--to continue flying to Chicago. As a result, we had to go through customs and security in London, and would have most definitely missed our connecting flight back home to the States if not for a woman in customs at Heathrow who let us cut to the front of the line. I will never fly Iberia again and will be lodging a formal complaint."

Pros: "Nothing"
Cons: "No free snacks or drinks"

Pros: "Easy check in and comfortable seats"

Cons: "Too little time to connect with another flight at Heathrow. Missed my connecting flight. Why is there an additional security checkpoint at Heathrow when you've already been thru security at another airport? Poor design for international arrivals."

Pros: "The ease at putting my luggage in.."
Cons: "The prices of the food and drinks!! Ripped off!!"

Pros: "Short 2 hour hop to Heathrow, adequate seating, nothing challenging about this flight. Barcelona airport is very user friendly, open and expansive. Service was good on the flight."
Cons: "Landed at heathrow, which is a sprawling airport and plenty of time required for the endless walking, bussing, and subway connections between terminals and gates. But efficient."

Pros: "We were overall very pleased with everything about, thank you!"

Pros: "Nothing"
Cons: "Kept us waiting for five hours"

Cons: "Late departure."

Pros: "Guests were boarded quickly. Crew was friendly."
Cons: "Food was tasteless and bland. Crew was not very attentive."

Cons: "The seat did not recline, a bit ridiculous for a plane that size"

Cons: "The fight from Chicago to London was a nightmare."

Pros: "Best transatlantic flight for a long time. More legroom quiet and delays were communicated well"
Cons: "Would have liked another couple rounds of water"

Pros: "Loved the gluten free meal option."

Pros: "Spaciousness of aircraft, comfort of aircraft (vibration, noise)"

Cons: "not enough leg room. and i have to point out that I am a petite 110 lbs, 5'2" woman. although the flight is short, a complimentary snack and drink would have been nice. instead, you had to pay for anything you wanted. prices on top of that, were exaggerated. very disappointing."

Pros: "Great flight attendants."
Cons: "Plane needs wi fi and USB ports. It was a dinosaur ! Cramped seating. Expensive!"

Pros: "Good movie selection"
Cons: "VERY cramped"

Pros: "The flight from Raleigh to Heathrow London was LONG, so I especially enjoyed the wine being included without extra cost! Wine helped me to relax, read, & survive the long sleepless night!"

Read more about Finnair
COVID-19 information

Safety measures for airlines flying from Seattle to London Heathrow Airport

Airlines flying from Seattle to London Heathrow Airport have enacted additional safety measures and adjusted policies to better accommodate travellers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from Seattle to London Heathrow Airport

Mandatory masks

Masks required on board, masks provided on flights from Seattle to London Heathrow Airport

Social distancing seating

Middle seats unavailable to book on flights from Seattle to London Heathrow Airport

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from Seattle to London Heathrow Airport

Book cheap flights from Seattle to London Heathrow Airport

Cheapest flights to London Heathrow Airport from Seattle found in 2021 and 2022

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2 stops
Multiple Airlines
18h 55m
LHR - SEA
1/11
Mon
2 stops
Multiple Airlines
18h 20m
SEA - LHR
9/11
Tue
2 stops
Multiple Airlines
18h 20m
LHR - SEA
16/8
Mon
direct
Finnair
9h 20m
SEA - LHR
27/8
Fri
direct
Finnair
10h 10m
LHR - SEA
20/9
Mon
2 stops
Multiple Airlines
16h 55m
SEA - LHR
4/10
Mon
2 stops
Multiple Airlines
29h 15m
LHR - SEA
2/12
Thu
2 stops
Multiple Airlines
27h 05m
SEA - LHR
13/12
Mon
2 stops
Multiple Airlines
38h 43m
LHR - SEA
11/10
Mon
2 stops
Multiple Airlines
16h 55m
SEA - LHR
21/10
Thu
2 stops
Multiple Airlines
19h 05m
LHR - SEA
12/10
Tue
2 stops
Multiple Airlines
19h 05m
SEA - LHR
20/10
Wed
2 stops
Multiple Airlines
18h 55m
LHR - SEA
16/8
Mon
1 stop
Multiple Airlines
14h 39m
SEA - LHR
27/8
Fri
1 stop
Multiple Airlines
18h 39m
LHR - SEA
13/8
Fri
direct
Finnair
9h 25m
SEA - LHR
22/8
Sun
direct
Finnair
10h 10m
LHR - SEA
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Recent one-way flight deals

28/12
Tue
2 stops
Multiple Airlines
27h 10m
SEA - LHR
4/10
Mon
2 stops
Multiple Airlines
18h 35m
SEA - LHR
27/9
Mon
1 stop
Multiple Airlines
21h 05m
SEA - LHR
8/9
Wed
1 stop
Multiple Airlines
21h 05m
SEA - LHR
27/9
Mon
2 stops
Multiple Airlines
16h 35m
SEA - LHR
8/9
Wed
1 stop
Multiple Airlines
21h 05m
SEA - LHR
12/9
Sun
3 stops
Multiple Airlines
28h 20m
SEA - LHR
8/9
Wed
2 stops
Multiple Airlines
18h 35m
SEA - LHR
10/12
Fri
2 stops
Multiple Airlines
27h 10m
SEA - LHR
27/8
Fri
3 stops
Multiple Airlines
30h 23m
SEA - LHR
18/8
Wed
3 stops
Multiple Airlines
34h 20m
SEA - LHR
10/9
Fri
3 stops
Multiple Airlines
36h 20m
SEA - LHR
12/9
Sun
2 stops
Multiple Airlines
26h 21m
SEA - LHR
15/9
Wed
2 stops
Multiple Airlines
27h 01m
SEA - LHR
16/9
Thu
2 stops
Multiple Airlines
18h 35m
SEA - LHR
27/9
Mon
3 stops
Multiple Airlines
24h 40m
SEA - LHR
15/9
Wed
1 stop
Multiple Airlines
16h 35m
SEA - LHR
7/10
Thu
2 stops
Multiple Airlines
20h 19m
SEA - LHR
18/8
Wed
3 stops
Multiple Airlines
34h 20m
SEA - LHR
4/10
Mon
direct
Iberia
9h 35m
SEA - LHR
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