£169 Find Cheap Flights from Seattle to the United Kingdom – Compare and Save

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 the United Kingdom departing on 29/8. 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.
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Cheap Flights from Seattle to the United Kingdom

Cheapest return prices found by our users on KAYAK in the last 72 hours
London
London1 stop£479
Manchester
Manchester1 stop£474
Edinburgh
Edinburgh1 stop£455
Birmingham
Birmingham2 stops£529
Bristol
Bristol2 stops£611
Liverpool
Liverpool1 stop£597
Aberdeen
Aberdeen1 stop£650
Leeds
Leeds2 stops£711
Inverness
Inverness1 stop£569
London
London1 stop£479
Manchester
Manchester1 stop£474
Edinburgh
Edinburgh1 stop£455
Birmingham
Birmingham2 stops£529
Bristol
Bristol2 stops£611
Liverpool
Liverpool1 stop£597
Aberdeen
Aberdeen1 stop£650
Leeds
Leeds2 stops£711
Inverness
Inverness1 stop£569

Book Cheap Seattle to the United Kingdom Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Seattle to the United Kingdom 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 the United Kingdom

Sat, 10 Oct - Sun, 18 Oct
Icelandair Logo
19:00 - 13:20
SEA
-
EDI
10h 20m
1 stop
Icelandair Logo
14:15 - 17:55
EDI
-
SEA
11h 40m
1 stop
£455Icelandair
Wed, 2 Dec - Sun, 6 Dec
Icelandair Logo
14:35 - 10:45
SEA
-
MAN
12h 10m
1 stop
Icelandair Logo
11:55 - 17:00
MAN
-
SEA
13h 05m
1 stop
£474Icelandair
Sat, 12 Sep - Mon, 21 Sep
Icelandair Logo
23:25 - 11:55
SEA
-
LHR
28h 30m
1 stop
Icelandair Logo
21:25 - 20:40
LHR
-
SEA
31h 15m
1 stop
£479Icelandair
Wed, 7 Oct - Wed, 21 Oct
Icelandair Logo
19:00 - 14:40
SEA
-
LGW
11h 40m
1 stop
Icelandair Logo
15:40 - 17:55
LGW
-
SEA
34h 15m
1 stop
£480Icelandair
Mon, 23 Nov - Wed, 2 Dec
British Airways Logo
18:45 - 16:35
SEA
-
ABZ
13h 50m
1 stop
British Airways Logo
20:55 - 11:25
ABZ
-
SEA
22h 30m
1 stop
£650British Airways
Mon, 23 Nov - Wed, 2 Dec
British Airways Logo
18:45 - 16:35
SEA
-
ABZ
13h 50m
1 stop
British Airways Logo
20:55 - 11:25
ABZ
-
SEA
22h 30m
1 stop
£650British Airways
Wed, 21 Oct - Wed, 18 Nov
Virgin Atlantic Logo
13:45 - 18:30
SEA
-
LCY
20h 45m
1 stop
Virgin Atlantic Logo
20:05 - 11:47
LCY
-
SEA
23h 42m
1 stop
£652Virgin Atlantic
Wed, 14 Oct - Thu, 22 Oct
KLM Logo
13:45 - 09:30
SEA
-
LCY
11h 45m
1 stop
KLM Logo
10:00 - 16:35
LCY
-
SEA
14h 35m
1 stop
£653KLM
Wed, 21 Oct - Wed, 18 Nov
Virgin Atlantic Logo
07:20 - 09:30
SEA
-
LCY
18h 10m
2 stops
Virgin Atlantic Logo
20:05 - 11:47
LCY
-
SEA
23h 42m
1 stop
£655Virgin Atlantic
Thu, 6 Aug - Wed, 26 Aug
Aer Lingus Logo
19:10 - 19:55
SEA
-
BHX
16h 45m
1 stop
Aer Lingus Logo
08:10 - 17:10
BHX
-
SEA
17h 00m
1 stop
£668Aer Lingus
Booking Insights

KAYAK's insights & trends for Seattle to the United Kingdom flights

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

What is the cheapest Seattle to the United Kingdom flight route?

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

The cheapest ticket to the United Kingdom from Seattle found in the last 5 days was to London, at £705 return. The most popular route is from Seattle (SEA) to London Heathrow Airport (LHR), and the cheapest return airline ticket found on this route in the last 5 days was £705.

What is the cheapest time of day to fly to the United Kingdom?

The average price for all round-trip flights from Seattle to the United Kingdom depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to the United Kingdom is generally in the afternoon, when retur flights cost £609 on average. Morning departures are around 100% cheaper than evening flights, on average. The most expensive time of day to fly to the United Kingdom is generally at night, which is peak travel time and where the average cost of a ticket is £680.

Can I save money by flying with a stopover from Seattle to the United Kingdom?

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 £690 on average.

What is the cheapest month to fly from Seattle to the United Kingdom?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to the United Kingdom, 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 the United Kingdom is January, when tickets cost £482 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of return tickets is £904 and £770 respectively.

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

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

If your flying dates are flexible, you should consider flying to United Kingdom on a Tuesday, as we generally find the cheapest rates on that day for this route. On the other hand, Friday is the most expensive day to fly from Seattle to United Kingdom. For your return ticket, we recommend flying on a Thursday and avoiding Sundays for the best deals.

How far in advance should I book a flight from Seattle to the United Kingdom?

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 the United Kingdom, 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 a flight from Seattle to the United Kingdom, you should book around 3 weeks before departure, which saves you about 29% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know - Cheap tickets from Seattle to the United Kingdom

Low season

January

Cheapest flight

£169
Best time to beat the crowds (10% less expensive on average)
Most popular time to fly and prices are also 9% lower on average.
Flight from Seattle to Edinburgh

Flights from Seattle to the United Kingdom: the best tips from KAYAK users

Insights shared by verified travellers who flew the route from Seattle to the United Kingdom 
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 - booking United Kingdom flights

  • How does KAYAK find such low prices on flights from Seattle to the United Kingdom?

    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 the United Kingdom.

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

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

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

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

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

    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 from Seattle to the United Kingdom up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding a cheap flight from Seattle to the United Kingdom

  • Looking for a cheap flight from Seattle to the United Kingdom? 25% of our users found tickets from Seattle to the United Kingdom for the following prices or less: London £260 one-way - £730 round-trip

Reviews of the top 5 airlines flying from Seattle to the United Kingdom

 
Need help choosing which airline to fly with from Seattle to the United Kingdom? 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.
7.9
Alaska AirlinesOverall score based on 12679 reviews
7.8Comfort
8.5Crew
7.0Entertainment
8.1Boarding
7.0Food
Airline reviews

Good flight, loved the snacks (Biscoff cookies). For boarding, they forgot to change the sign showing our group was boarding. Apparently, they had announced it, but the announcements overlapped with another gate announcements and no one could actually hear what they were saying. So a group of us were waiting....and finally asked and were told we could board.

10.0 ExcellentAnonymous, Jul 2026
SEA - SJC
Read more Alaska Airlines reviews

Good flight, loved the snacks (Biscoff cookies). For boarding, they forgot to change the sign showing our group was boarding. Apparently, they had announced it, but the announcements overlapped with another gate announcements and no one could actually hear what they were saying. So a group of us were waiting....and finally asked and were told we could board.

I had the row all to myself, which was fantastic! The food was pretty weak, though, which is an annoying thing about current travel. I didn't check out the entertainment, so can't rate that.

overall no call for accessible while boarding. The crew member was little rude not bothering about the condition. Seat assigned was very uncomfortable.

Alaska Airlines demonstrated their insensitivity and lack of compassion when I asked for an emergency rescheduling/cancellation due to a dire family emergency. My father was in the Hospital ICU with a terminal prognosis with no other family in the state to help manage the situation and I called AA to ask whether something could be done about moving my flight to a later date, but the AA agent on the phone was firm in not offering any alternative other than to tell me I had to eat the entire cost of the flight. I did not appreciate having to manage that loss on top of juggling time-sensitive matters with my family as my father and I dealt with his life-threatening emergency. I'm very disappointed in the airline for not even attempting to provide assistance other than to quickly shut me down completely. I was really shocked with their treatment of the matter and unlikely to use their airline again.

All went well from checking in Seattle till landing in New Orleans. The whole crew work well . The customer service is amazing . They are knowledgeable friendly and serviceable.

Alaska, in my opinion, is one of the best airlines. I have flown them for 30+ years and watched them grow from a small NW carrier to the size they are today. Day-in, day-out they are very good.

Act all nice like they’re from the Midwest or something and they take all your money

No entertainment or food on a short flight, even in first class

A smooth flight; a little cold on the ground and then suddenly heated when in the air; legroom on the 737-800 worse than on the outgoing flight, on 737-900. Much prefer flying Alaska to the northwest than flying American anywhere!

The flight was canceled and dumped everyone in Albany. I still haven’t received reimbursement for transportation for getting to NYC or appropriate compensation for the cancelled flight.

Had to cancel and rebook, KLM connection was cancelled prior to departure, ended up flying to Munich on non-Delta carrier.

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

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!!

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.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

The plane. Airbus A330-200. Comfortable for a 7-hour flight. Seats seemed to have more legroom. I was in row 17. Flight was operated by Delta but was better than expected.

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

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

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 crew was excellent as ever on Virgin. The special meal was poor unfortunately. More significantly when we arrived at Manchester Airport there was no air bridge provided and we had to exit the plane down a rickety stair case. This is unacceptable for a transatlantic flight. Whilst I understand that this is the airport’s fault at the end of the day the airline is responsible for our transportation and needs to do something.

Super friendly and helpful staff, from check-in desk to cabin crew.

Good overall. Cannot fault the airlines. I have had better entertainment systems before ie ice in Emirates but it was not too bad. Food was decent and staff were friendly.

Miami airport needs more thorough signage. It was a long walk from my transport point to the check in desk,

Flight took off an hour late. Had to stay on the tarmac for half an hour after landing. Both annoying.

The crew was very good. However, the equipment was a bit dated. Some of the electronics were not working. To top it, three bags didn’t arrive with me. Two of them were delivered a day later. I’m still waiting for the third bag, I was so looking forward to this virgin Atlantic flight, but, I am disappointed.

i saved my points for more than 10 years in anticipation of treating myself to an upper class fight to and from london on virgin atlantic. i was shocked to find what you consider “upper class” on the dreamliner. it was, at best, a mediocre business class accommodation. it was tight and not that comfortable, with nearly no personal storage. everything was cramped and just generally disappointing. once i lucked into a 1st class upgrade to europe on lufthansa - a magical experience that found me reluctant to sleep, lest i deprive myself the joy of their setup. i expected something similar from virgin atlantic, but i could not have been more wrong. it will be the same arrangement on my flight home, but at least i know what (not) to expect. to be clear, this is only in reaction to the physical accommodations. your people were, and always are fantastic.

The ticket was reserved in my name but not paid for by underpricer. Alaska airlines was unable to issue my ticket (could not connect the ticket with the PNR) due to an error with underpricer and I spent the better part of 2 hours at the ticket counter trying to rectify.

Damage May baggage and I report the airport agant and they see it

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

The staff was kind and helpful. There was no food, and you needed to bring your own earphones to use the entertainment, which I didn’t know.

Seat was hard and uncomfortable and the temperature too warm and uncomfortable.

Everything was good. Only issue comes from being vegan and flying. The food options are super limited.

Overall good for an economy fare. IMO the movie selection could be improved. Great that you can now connect bluetooth headphones to the entertainment system.

7 hours 15 min flight from SEA to Iceland with no inflight entertainment and no power to charge your own devices, also no meal service, not even any snacks/cookies. You have to buy food and the options are extremely limited (i.e. ham and cheese sandwich and spicy cup noodles). I didn't think Iceland air was a budget airline, maybe I was wrong, the cost of the ticket didn't feel like it though.

Very nice flight, easy connections in Keflavík, and friendly crew.

Meh. Lived the seat. The entertainment unit did not work and had to be reset 3 times. Service was SLOW taking over 90 min to be served. Crew forgot about my meal. Chicken was dry and almost inedible.

Flying on the Boeing 787 from Seattle to London was everything that I expected. Every thing was great.

Moved me away from my family and refused to fix it.

Connection at Hethrow was horrible..We couldn't get out of the plane for an hour as they were buying people to the airport and there were not enough busses. We had 2 and half hf between flights so it was very tight. After departing plane we had to go thru security again. People with less time in between connections missed their flights

Captain sick. Unable to get replacement so delayed me 30 hours, many others delayed 54 hours. TOTALLY DESTROYED ALL MY PLANS, including lost my rental car which would now cost over 5 times what I paid so stuck with buses n trains... lost hotel reservations.... HORRIBLE!!!

The BA business class cabin is excellent,very comfortable for sleeping but the service could be improved.

The flight from Seattle was delayed, which made me miss my connection to Florence. I was re-booked NINE HOURS LATER!!! That’s basically a vacation day lost. British Airways needs to partner with other airlines when possible to get a more realistic travel time, if delays occur. I realize there aren’t many flights to Florence from London, so I would book differently were I to return. The actual flight from Seattle was very comfortable and the crew was great, no faults there. I enjoy British Airways, this was an anomaly.

Could have done with a 2nd round of drinks even if it was only to distribute bottled water

The second leg of my flight unexpectedly got canceled. I was stuck at the airport for the whole day and instead of flying out that morning I flew out in the evening. For some of my fellow passengers it was the second cancellation and their original flight was supposed to go out the day before. There was no reason given though getting rebooked was quick even though I would have preferred if I would have been on one of the earlier flights that day. Compensation was a £10 voucher for some food at the airport. I eventually arrived without further incident but but due to the cancellation, it was one of my more frustrating travels of my life.

Due to a cyber attack at the SeaTac airport ALL of the airport computers at the airport were down. This seriously impacted every airline at the airport and the resulted in our flight leaving a hour later than scheduled. This delay caused us to miss our connecting flight from Heathrow to Edinburgh. I was amazed to have British Airways staff meet us at the gate as we left our flight. They quickly provided us with new boarding passes for a flight going to Edinburgh later the same day. Problems sometimes happen but they handled the situation in first class style.

Everything you need to know for your flight from Seattle to the United Kingdom

Information on your arrival and departure airports