YXU - SEA

C$ 231 Find Cheap Flights from London to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Seattle departing on 12/10. 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

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, 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 London to Seattle, as well as popular online travel agencies
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Flight Deals

Cheap Flights from London to Seattle (YXU-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from London to Seattle 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 round-trip flight deals from London to Seattle

Mon, 8 Dec - Tue, 27 Jan
WestJet Logo
8:10 p.m. - 2:20 p.m.YXU-SEA
21h 10m1 stop
WestJet Logo
3:10 p.m. - 6:34 a.m.SEA-YXU
12h 24m1 stop
C$ 364WestJet
Find Deal
Sun, 14 Dec - Tue, 27 Jan
WestJet Logo
8:10 p.m. - 2:20 p.m.YXU-SEA
21h 10m1 stop
WestJet Logo
3:10 p.m. - 6:34 a.m.SEA-YXU
12h 24m1 stop
C$ 365WestJet
Find Deal
Sun, 7 Dec - Mon, 26 Jan
WestJet Logo
8:10 p.m. - 2:20 p.m.YXU-SEA
21h 10m1 stop
WestJet Logo
3:10 p.m. - 6:34 a.m.SEA-YXU
12h 24m1 stop
C$ 374WestJet
Find Deal
Fri, 5 Dec - Tue, 27 Jan
Air Canada Logo
5:45 a.m. - 2:31 p.m.YXU-SEA
11h 46m2 stops
Air Canada Logo
5:50 a.m. - 9:21 p.m.SEA-YXU
12h 31m2 stops
C$ 379Air Canada
Find Deal
Thu, 11 Dec - Thu, 29 Jan
WestJet Logo
8:10 p.m. - 10:23 a.m.YXU-SEA
17h 13m2 stops
WestJet Logo
3:10 p.m. - 6:34 a.m.SEA-YXU
12h 24m1 stop
C$ 382WestJet
Find Deal
Wed, 3 Dec - Sun, 18 Jan
Air Canada Logo
5:40 p.m. - 10:16 p.m.YXU-SEA
7h 36m1 stop
Air Canada Logo
5:50 a.m. - 9:21 p.m.SEA-YXU
12h 31m2 stops
C$ 422Air Canada
Find Deal
Wed, 17 Dec - Tue, 27 Jan
United Airlines Logo
5:40 p.m. - 10:16 p.m.YXU-SEA
7h 36m1 stop
United Airlines Logo
5:00 a.m. - 9:21 p.m.SEA-YXU
13h 21m3 stops
C$ 464United Airlines
Find Deal
Tue, 16 Dec - Tue, 27 Jan
United Airlines Logo
5:45 a.m. - 1:47 p.m.YXU-SEA
11h 02m2 stops
United Airlines Logo
5:00 a.m. - 9:21 p.m.SEA-YXU
13h 21m3 stops
C$ 471United Airlines
Find Deal
Mon, 17 Nov - Sun, 30 Nov
 Logo
8:10 p.m. - 2:20 p.m.YXU-SEA
21h 10m1 stop
 Logo
11:10 p.m. - 7:12 p.m.SEA-YXU
17h 02m2 stops
C$ 480
Find Deal
Tue, 18 Nov - Sun, 30 Nov
 Logo
8:10 p.m. - 7:11 a.m.YXU-SEA
14h 01m2 stops
 Logo
3:10 p.m. - 7:12 p.m.SEA-YXU
25h 02m1 stop
C$ 483
Find Deal

Everything you should know

Top airlines
WestJet
Cheapest • from C$ 364 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
C$ 364
WestJet
Mon 8/12Tue 27/1
YXU - SEA • 1 stop
Cheapest one-way flights
C$ 231
Air Canada
Sun 12/10
YXU - SEA • 1 stop
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Booking Insights

KAYAK's insights & trends for London to Seattle flights

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

Which airlines provide the cheapest flights from London to Seattle?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from London to Seattle were found on WestJet (C$ 364) and Air Canada (C$ 379).

Good to know

Cheapest flightC$ 231
Flight from London to Seattle

When to book flights from London to Seattle

Are your dates flexible? Find out the best times to travel from London to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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.

FAQs for booking flights from London to Seattle

  • What is the cheapest flight from London to Seattle?

    In the last 3 days, the lowest price for a flight from London to Seattle was C$ 167 for a one-way ticket and C$ 263 for a round-trip.

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

    London airport is called London and the only airport in Seattle is Seattle/Tacoma Intl.

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

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from London to Seattle?

    Star Alliance is the only airline alliance operating flights between London and Seattle.

  • Which is the best airline for flights from London to Seattle, United Airlines or WestJet?

    The two airlines most popular with KAYAK users for flights from London to Seattle are United Airlines and WestJet. With an average price for the route of C$ 296 and an overall rating of 7.4, United Airlines is the most popular choice. WestJet is also a great choice for the route, with an average price of C$ 416 and an overall rating of 7.2.

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

    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 London to Seattle.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from London 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 London to Seattle?

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

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

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

Reviews of the top 3 airlines flying from London to Seattle

 
See real verified KAYAK customer reviews for airlines flying from London to Seattle. 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 London to Seattle? 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.
7.4
United AirlinesOverall score based on 8929 reviews
8.1Crew
6.6Food
7.3Comfort
7.1Entertainment
7.7Boarding
Airline reviews

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

10.0 ExcellentPaulos, Aug 2025YUL - IAD
Read more United Airlines reviews

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

My flight was delayed about 1 1/2 hours in Chicago, but other then that it was a good flight.

The experience was great, the crew was very polite and hospitable. I will definitely make if my go to airlines.

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

Efficient, calm when things were delayed and kept us regularly informed of what was happening.

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

Airbus plane, nice and polite staff, entertainment even as it was a short flight.

Very nice and clean plane. Transit time between flights was tight though

Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy

So far so good but food and entertainment are not available for this flight

I like how spacious the plane was but I did not like the fact that there was no entertainment

No dogs! Can we have no dogs in the cabin? Why was there a yappy little dog behind me? Lucky I had ear plugs. Sorry for others without

In spite of purchasing premium, I felt it was perhaps the most uncomfortable seat I have flown in. The base was either broken or poorly made and had no support. Even placing pillows and blankets on the seat (1D aisle) didn’t help. It made for a long and mostly sleepless six hour flight. Crew also were very loudly talking to each other through the night making it very hard to sleep. It was purchased for the price, so I get the risk, but was not impressed.

Good value, minor delay due to waiting for inbound plane but they gave accurate information about wait time. Able to switch to a seat by my husband thanks to a kind flight attendant

Absolutely terrible, from the customer service to boarding the plane. On the phone, there was some mishaps with getting in my correct date and they did not help me retrieve a refund or any assistance. I’m gonna be reporting to all my followers and family around the region of Los Angeles to New York.

Arrival at Comox from, London,ON 6 hours later... No bueano

Generally good. However. The flight left 30 mins behind schedule with no reason given.

Flight delayed, missed my pick-up had to Uber, plus missed dinner and medication, so sad!

Nothing to like because my inbound flight was cancelled without notification by West Jet or third party, JustFly. I couldn’t take the inbound flight due to cancellation; therefore could not take the outbound flight back.

Not the greatest experience everything was pretty mediocre. My seat was by the washroom in the aisle and was not located well as everyone past each other people were right in my seat and space.

I liked the behaviour of the crew members.The flight was good.

I swear airplane seats keep getting smaller and smaller but everything else was great. Smooth sailing and we got in early.

No food to provide, they forgot that, in some cases, people stay at the airport for hours without food. Now, to provide them with food, they have to ask them to pay, because some don't have money. That way, they can't eat.

After a long flight from Tokyo, our connecting flight home was canceled due to “maintenance” while we were on our layover in Toronto. Very frustrating to close out our honeymoon, although I’m sure others had it even worse during last week’s strike. Air Canada staff at Pearson Airport are the one thing that kept me remotely at peace during this — they were very helpful and deserve a lot of props. But I would not fly Air Canada again.

Horrible flight cancelled had to buy another very expensive ticket

Air Canada marooned me in Canada with no way back home during my summer vacation. I had to buy a last minute flight ticket for over $500 to make it back home. I have their credit card and have flown them for years. Never again.

Flight was cancelled last minute. Had to scramble and purchase a $2000 flight through a separate airlines. Stuck in Toronto two extra days. Missed my first two days on a new job. Had to rent a car for an additional two days. Scrambled to fins a place to live those extra two days. Spent a ton of extra money and lost a lot of money, as well as made a poor impression at work. Difficult difficult difficult

Terrible, return flight was cancelled a night before the flight was scheduled to depart and I was notified by an email and an automated message on their phone line. I’ll never book Air Canada again

Biggest problem for me is that I am Star Alliance Gold and they were not able to give me access to to Maple Lounge because of some computer glitch . It was management by information system. She could clearly see my status and still would not give me access because the computer woudl not let her. She should have override that be attentive to a customer and figure rhat out later

Great breakfast and coffee …..fastest bag service I have ever had in NOLA

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

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