SEA - LON

£271 Find Cheap Flights from Seattle to London

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to London departing on 5/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to London

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to London, as well as popular online travel agencies
Travellers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest return fare
£660
Delta
Sun 13/9Fri 18/9
SEA - LCY • 1 stop
Cheapest direct flights
£678
Typical prices: £723-£474
British Airways, Finnair
Thu 17/9Fri 25/9
SEA - LHR • Direct
Advice from real travellers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
BA premium economy adds extra legroom and priority boarding on Seattle-London flights.
Virgin Economy Delight adds extra legroom plus priority check-in and boarding.
Expert advice
Expert advice
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Top airlines
Cheapest • from £659 (return)
Best reviews • 7.8 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Direct flights
You can fly direct with Alaska Airlines, British Airways, and others. Average duration is 9h 23m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top routes
Cheapest
Most popular
Insights
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Avoid delays
Most punctual • 94% on-time
Best time • Fewest delays
Insights
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Top stopover airports
Cheapest • Avg £581 (return)
Shortest trip • 11h 30m (one-way)
Insights
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When to book
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 27% compared to booking last minute.
Insights
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Insights
When to travel
Cheapest • 74% price drop
Most popular
Good to know
Good to know
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Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Seattle to London (SEA-LON)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Seattle to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Seattle to London

Sun, 13 Sep - Fri, 18 Sep
Delta Logo
13:50 - 09:30
SEA
-
LCY
11h 40m
1 stop
Delta Logo
10:00 - 16:35
LCY
-
SEA
14h 35m
1 stop
£660Delta
Mon, 29 Jun - Tue, 7 Jul
Multiple Airlines Logo
15:40 - 18:50
SEA
-
LGW
19h 10m
2 stops
Multiple Airlines Logo
19:45 - 20:40
LGW
-
SEA
32h 55m
2 stops
£669Multiple Airlines
Tue, 1 Sep - Mon, 21 Sep
Lufthansa Logo
19:20 - 06:30
SEA
-
LHR
27h 10m
2 stops
Lufthansa Logo
20:25 - 11:55
LHR
-
SEA
23h 30m
2 stops
£669Lufthansa
Tue, 18 Aug - Wed, 30 Sep
Scandinavian Airlines Logo
15:55 - 17:40
SEA
-
LHR
17h 45m
1 stop
Scandinavian Airlines Logo
19:30 - 22:50
LHR
-
SEA
35h 20m
2 stops
£671Scandinavian Airlines
Mon, 31 Aug - Sat, 19 Sep
Multiple Airlines Logo
08:10 - 17:05
SEA
-
LHR
24h 55m
2 stops
Multiple Airlines Logo
13:45 - 22:57
LHR
-
SEA
17h 12m
1 stop
£672Multiple Airlines
Thu, 25 Jun - Tue, 30 Jun
Icelandair Logo
23:25 - 14:40
SEA
-
LGW
31h 15m
1 stop
Icelandair Logo
15:40 - 20:40
LGW
-
SEA
13h 00m
1 stop
£673Icelandair
Wed, 17 Jun - Sun, 21 Jun
Icelandair Logo
23:25 - 14:40
SEA
-
LGW
31h 15m
1 stop
Icelandair Logo
15:40 - 17:55
LGW
-
SEA
34h 15m
1 stop
£675Icelandair
Thu, 3 Sep - Tue, 22 Sep
KLM Logo
20:10 - 14:00
SEA
-
LHR
9h 50mdirect
KLM Logo
06:30 - 11:47
LHR
-
SEA
13h 17m
1 stop
£676KLM
Wed, 23 Sep - Sun, 4 Oct
Lufthansa Logo
18:50 - 17:05
SEA
-
LHR
14h 15m
1 stop
Lufthansa Logo
06:30 - 18:32
LHR
-
SEA
20h 02m
2 stops
£678Lufthansa
Wed, 29 Jul - Wed, 19 Aug
KLM Logo
13:45 - 09:30
SEA
-
LCY
11h 45m
1 stop
KLM Logo
09:20 - 16:27
LCY
-
SEA
15h 07m
1 stop
£696KLM
Booking Insights

KAYAK’s insights & trends for Seattle to London flights

Get data-powered insights and trends into flights from Seattle to London to help you find the cheapest flights, the best time to fly and much more.

How much is a return flight from Seattle to London?

This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from Seattle to London departing in September.

What is the cheapest Seattle to London flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest return flight from Seattle to London costs £621 on the route between Seattle (SEA) and London Heathrow Airport (LHR). It is also the most popular route.

What’s the cheapest day of the week to fly from Seattle to London?

The average price of all round-trip flights from Seattle to London clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to London on a Thursday and more expensive on a Monday. On your return trip to Seattle, you should consider flying back on a Thursday, and avoid Sundays for better deals.

What is the cheapest month to fly from Seattle to London?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to London, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to London is January, where tickets cost £240 (return) on average. On the other hand, the most expensive months are November and December, where the average cost of round-trip tickets is £2,483 and £1,587 respectively.

Can I save money by flying with a stopover from Seattle to London?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 2 stops stopover the cheapest option at £626 on average.

How far in advance should I book a flight from Seattle to London?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to London, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to London, you should book around 3 weeks before departure, which saves you about 27% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Expert advice

Expert advice for your flight from Seattle to London

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on Air France and KLM

Blane Bachelor is a journalist and editor specialising in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favourite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history.

Gabriel Leigh

Gabriel Leigh

Expert on Finnair

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Laura Ratliff

Laura Ratliff

Expert on Virgin Atlantic

Laura Ratliff is a New York-based writer and editor. She lives in downtown Brooklyn with her husband and their beloved dogs. Originally from Texas, she now considers New York City her home. She typically spends more than 200,000 miles on a plane each year and stays in plenty of hotels.

Duncan Madden

Duncan Madden

Expert on British Airways

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Kirstie Pickering

Kirstie Pickering

Expert on LHR

Aviation and business journalist Kirstie didn’t leave England until she was 18 years old, but has since travelled to over 20 countries including Japan, Canada, and Iceland. Her travel expertise lies in European city breaks, including how to find the best locally-owned hotels and restaurants and how to optimise the airport experience for your needs.

Harriet Baskas

Harriet Baskas

Expert on SEA

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, The Points Guy, and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know - Cheap tickets from Seattle to London

Low seasonJanuary
Best time to beat the crowds (19% less expensive on average)
Most popular time to fly and prices are also 16% lower on average.

When to book flights from Seattle to London

Are your dates flexible? Find out the best times to travel from Seattle to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Seattle to London: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Seattle to London 
MichaelFlew with Delta
SEA
-
LHR
May 2026
We like Delta, Alaska and American. Be prepared for a bit of a trek from your arrival gate to Customs and outside services. Heathrow doesn't rank high on my list of major airports.
Verified travelerFlew with American Airlines
SEA
-
LHR
Apr 2026
Heathrow is too gigantic to have less than 2 hours of layover time.
Verified travelerFlew with British Airways
SEA
-
LHR
Apr 2025
Make sure you have plenty of time between flights if you are delayed.
Verified travelerFlew with British Airways
SEA
-
LHR
Feb 2025
Don’t take a flight if you sick, or if you have no choice prepare to stay covered with mask throughout the flight
Verified travelerFlew with British Airways
SEA
-
LHR
Apr 2024
Bring a sack lunch -- airport food was very expensive.

FAQs for booking flights from Seattle to London

  • Are there onsite hotels at Heathrow Airport or Gatwick Airport?

    Heathrow Airport features a number of hotels connected directly to its terminals, so visitors have a selection of airports to choose from. In Terminal 4 travelers will find the Hilton London Heathrow Airport and the capsule hotel YOTEL, while in Terminal 5 there is the Sofitel London Heathrow. Gatwick airport also has a variety of hotel options available, such as Hampton by Hilton, YOTELAIR, and Bloc Hotel.

  • Can I fly from Seattle to London non-stop?

    British Airways, Iberia, Virgin Atlantic, Finnair, and Delta Air Lines all offer direct nonstop flights from Seattle to London via Heathrow Airport. Many other airlines also offer one-stop flights to London from Seattle with final destinations varying largely between Heathrow Airport, Gatwick Airport, and London City Airport.

  • What is the quickest way from Heathrow Airport to downtown London?

    The Heathrow Express is the fastest way to get to central London from Heathrow Airport and is conveniently connected to Terminals 2, 3, and 5. There is also a direct London Underground connection via the Piccadilly Line, for those who prefer the cheaper (but slower) method of travel.

  • Should I fly to Heathrow Airport or Gatwick Airport?

    Both airports are conveniently connected via public transport to central London with travel times roughly equal. However, if your final destination is on the south or east side of London, then Gatwick is likely the better option due to its close proximity, while Heathrow is more convenient for destinations on the west and north side.

  • What is the cheapest flight from Seattle to London?

    In the last 3 days, the lowest price for a flight from Seattle to London was £271 for a one-way ticket and £659 for a return.

  • Which airports will I be using when flying from Seattle to London?

    Seattle is served by only 1 airport and there are 2 airports in London. You will leave Seattle from Seattle/Tacoma Intl and you will be arriving in London at one of these airports: London City or London Heathrow.

  • Which airlines offer Wi-Fi service onboard planes from Seattle to London?

    All the following airlines offer inflight Wi-Fi service on the Seattle to London flight route: KLM, Air France, Delta, Virgin Atlantic, Scandinavian Airlines, American Airlines, and Air Europa.

  • Which aircraft models fly most regularly from Seattle to London?

    The Airbus A330-900neo is the aircraft model that flies most regularly on the Seattle to London flight route.

  • Which airline alliances offer flights from Seattle to London?

    oneworld, and SkyTeam are the airline alliances operating flights between Seattle and London, with oneworld being the most commonly used for this route.

  • On which days can I fly direct from Seattle to London?

    There are direct flights from Seattle to London on a daily basis.

  • Which is the best airline for flights from Seattle to London, KLM or Virgin Atlantic?

    The two airlines most popular with KAYAK users for flights from Seattle to London are KLM and Virgin Atlantic. With an average price for the route of £569 and an overall rating of 7.8, KLM is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of £690 and an overall rating of 7.5.

  • How does KAYAK find such low prices on flights from Seattle to London?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to London.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to London?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to London?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London with an airline and back to Seattle with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to London?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Seattle to London

  • Looking for a cheap flight from Seattle to London? 25% of our users found flights on this route for £466 or less one-way and £736 or less round-trip.
  • Link Light Rail and bus services connect Seattle-Tacoma International Airport to downtown Seattle quickly and efficiently. The Link is just outside the airport on the fourth floor of the adjacent parking garage and runs all the way from the airport to the University of Washington.
  • Families flying with children may want to consider visiting Seattle-Tacoma International Airport’s Playroom. It is the perfect spot to help kids burn off excess energy before their flight. The Playroom is located across from the Seattle Tap Room in the Central Terminal near the A gates.
  • There are many airports in London and travelers should keep their locations in mind when choosing which airport to fly into. London City Airport and Heathrow Airport are the most central of the airports and offer quick, easy access to the heart of London, while Gatwick Airport and London Stansted Airport are on the southside and northside of London, respectively.
  • Looking for a family-friendly activity to help pass the time prior to your flight? Why not check out a live music performance? All throughout the week, live music gigs are performed in Sea-Tac Airport’s various terminals to the enjoyment of passengers.
  • Travelers with flights from Seattle to London via Delta Air Lines may want to consider taking the chance to relax in comfort in one of Delta’s premium lounges. Delta operates two Delta Sky Clubs at Seattle-Tacoma International Airport, with one in Concourse A and the other in the airport’s Rooftop Area. There are also showers available at the Rooftop location.

Prefer to fly direct from Seattle to London?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Seattle/Tacoma Intl to London.
Find which airlines fly direct from Seattle/Tacoma Intl Airport to London, which days they fly and book direct flights.

Direct departures

Seattle/Tacoma Intl to London

Monday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Tuesday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Wednesday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Thursday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Friday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Saturday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Sunday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

See more direct flights

Direct returns

London to Seattle/Tacoma Intl

Monday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Tuesday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Wednesday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Thursday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Friday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Saturday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

Sunday

Alaska Airlines,British Airways,Delta, +1 more

Alaska Airlines,British Airways, +2 more

See more direct flights

Reviews of the top 4 airlines flying from Seattle to London

 
See real verified KAYAK customer reviews for airlines flying from Seattle to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to London? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
KLMOverall score based on 1527 reviews
8.4Crew
7.3Food
7.7Comfort
7.2Entertainment
7.8Boarding
Airline reviews

As always, it’s a pleasure to travel with KLM. It is one of my favorite airlines.

10.0 ExcellentGeorge, May 2026
OTP - AMS
Read more KLM reviews

As always, it’s a pleasure to travel with KLM. It is one of my favorite airlines.

As per usual when you Hit the UK it's a slow process through customs Not as efficient at Thailand for sure

There were no charge points for phones on the economy seats. The seats were comfortable overall. Food was okay.. flight was on time

It was really nice experience by flying this klm flight.I personally recommend everyone to please try this klm flight

The crew were unprofessional with a racist element. I was physically abused as well from one of the crew members

Empty seats next to me - wish it had been for a longer flight!!

Terrible last row seats many seats available but no offer to move to better seat

Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.

Seating and zone. The minor I went with didn’t even seat close to me

My seat 3G did not go down fully and the buttons were not working properly

Food has been disappointing in both legs of flight to india

Great staff great experience, made a 2 hour delay very bearable

Great staff, great experience, made a 2 hour delay very bearable

Food was the worst I’ve had on a VA flight. Normally it’s a lot better

I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼

These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.

Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.

The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great

The flight itself was fine, even with a one-hour delay leaving on the Reykjavik tarmac (the lost time was made up during flight). Our experience at the Reykjavik airport on arrival was terrible due mostly to the one hour it took for passport control. Only two stations were open for our category, and the room was full with a huge crowd.

I liked the crew but not the uncomfortable seats and lack of movie and tv selection.

They cancelled our connecting flight resulting in another layover reaching our final destination 8 hours later than scheduled.

At least one soda free, felt like I was nickeled to death.

On-time arrivals and departures. Crew helpful and friendly. Yet everything costs extra: seat selection, food, even airphones!

Was a bit surprised that Icelandair flies a domestically configured 757s on long-haul flights to Iceland (no lie-flat seats in business class).

The movie choices were poor. The worst problem is the treatment of passengers durinng pre-boarding. In one case the primes were checked in and sent down the boarding tunnek only to stand waiting there while the plane is cleaned. In the second case the bus was loaded, the doors closed and just stood there unmoving like sardeines in a tin for over TEN minutes. In both cases it was rough on us old guys who find standing for long periods trying.. In other words, Donnt just stack us up and forget us.

I had no idea that my ticket only paid for my right to get on the plane. They charged me $130 for my carry-on bag because it was 1 inch too big she claimed but it wasn’t! Then they wanted another fee for everything. I had no idea that Icelandair had changed to such a bargain basement airline. I was very disappointed.

Screen didn't work, and neither did the button to tilt the seat even though the seat was comfortable

Second time with Saga Premium, everything was fab, but the entertainment centre on both my flights didn't work, plus the seat on the NY to Rek flight (Airbus) was so solid and so uncomfortable. The 737Max flight's seat was much, much better.

Boarding process was chaotic. Confusion over Boarding gates: gate 55 or gate 56 ???. Unnecessary standing in long lines to board. Better to call out Boarding groups one at a time and everyone else to sit. Airline only has 2 Boarding groups 1-3 and 4-9. That causes over crowding and chaos

Lady next to me was coughing profusely the entire flight, other lady moved seats because of it, 8 hours of that during an overnight flight is a bit much.

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

Canceled flight late London to Florence. Help at airport very poor. Treated poorly. Had to sleep in the airport. Lost bags- still do not have them. Horrible. I should be reimbursed!

The seats are extra cramped if you are taller than 5’8! Spring for the extra legroom seats for sure if you have a long flight!

Very disappointed with British Airways. It has been over 24 hours and I still have not received my checked baggage or any proper update. Customer support has been unresponsive, making the situation even more frustrating. Poor baggage handling and lack of communication seriously impacted my travel experience.

Flight was good but temp in the cabin was cold.

I like American Airlines and their safety record. They provide quality service and a feel safe enough to prefer American Airlines over other carriers even if I have to pay a little more.

Cancelled flight and re booked seats were a downgrade. British Airways said the upgrade was t available but when I checked it was but then they wouldn’t make it right

Boarding was orderly, pilot and flight attendants were nice, entertainment options were good, and low sodium meals were quite tasty.

Everything you need to know for your flight from Seattle to London

Information on your arrival and departure airports