YXU - SEA

C$ 205 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 19/5. 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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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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Flights Deals

Cheap Flight Deals 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.

Recent round-trip flight deals from London to Seattle

KAYAK's recommended round-trip deals from the most popular airlines that fly from London to Seattle.
Discover the best prices for you by selecting your travel dates on KAYAK.
United Airlines Logo
6:15 a.m. - 10:45 a.m.YXU-SEA
7h 30m1 stop
United Airlines Logo
11:21 p.m. - 2:57 p.m.SEA-YXU
12h 36m2 stops
C$ 368United Airlines
Find Deal
Mon, 19 May - Fri, 20 Jun
United Airlines Logo
6:15 a.m. - 10:51 a.m.YXU-SEA
7h 36m1 stop
United Airlines Logo
5:05 p.m. - 2:57 p.m.SEA-YXU
18h 52m2 stops
C$ 374United Airlines
Find Deal
Thu, 12 Jun - Thu, 19 Jun
United Airlines Logo
3:45 p.m. - 12:59 a.m.YXU-SEA
12h 14m2 stops
United Airlines Logo
5:26 p.m. - 2:57 p.m.SEA-YXU
18h 31m2 stops
C$ 382United Airlines
Find Deal
Mon, 19 May - Fri, 20 Jun
United Airlines Logo
6:15 a.m. - 4:20 p.m.YXU-SEA
13h 05m2 stops
United Airlines Logo
5:05 p.m. - 2:57 p.m.SEA-YXU
18h 52m2 stops
C$ 455United Airlines
Find Deal
Thu, 12 Jun - Thu, 19 Jun
 Logo
6:00 a.m. - 12:58 p.m.YXU-SEA
9h 58m1 stop
 Logo
7:10 a.m. - 9:00 p.m.SEA-YXU
10h 50m1 stop
C$ 536
Find Deal
Mon, 19 May - Fri, 20 Jun
 Logo
6:00 a.m. - 12:34 a.m.YXU-SEA
21h 34m2 stops
 Logo
7:05 a.m. - 5:14 a.m.SEA-YXU
19h 09m1 stop
C$ 574
Find Deal
Fri, 27 Jun - Sun, 6 Jul
WestJet Logo
8:00 p.m. - 12:58 p.m.YXU-SEA
19h 58m1 stop
WestJet Logo
7:05 a.m. - 5:14 a.m.SEA-YXU
19h 09m1 stop
C$ 723WestJet
Find Deal
Fri, 27 Jun - Sun, 6 Jul
United Airlines Logo
6:15 a.m. - 10:51 a.m.YXU-SEA
7h 36m1 stop
United Airlines Logo
11:35 a.m. - 9:27 p.m.SEA-YXU
6h 52m1 stop
C$ 790United Airlines
Find Deal
Thu, 12 Jun - Thu, 19 Jun
WestJet Logo
8:00 p.m. - 7:32 a.m.YXU-SEA
14h 32m2 stops
WestJet Logo
3:40 p.m. - 5:14 a.m.SEA-YXU
10h 34m2 stops
C$ 861WestJet
Find Deal
Fri, 27 Jun - Sun, 6 Jul
WestJet Logo
6:00 a.m. - 2:09 p.m.YXU-SEA
11h 09m2 stops
WestJet Logo
1:15 p.m. - 5:14 a.m.SEA-YXU
12h 59m3 stops
C$ 2,390WestJet
Find Deal
Fri, 27 Jun - Sun, 6 Jul
Useful Info

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 United Airlines (C$ 368) and WestJet (C$ 723).


Good to know

Low seasonMay
High seasonJuly
Cheapest flightC$ 205
Best time to beat the crowds (51% less expensive on average)
Most popular time to fly and prices are also 39% lower on average.
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$ 148 for a one-way ticket and C$ 266 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$ 360 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.

Top 3 airlines serving 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 8696 reviews
7.3Comfort
7.7Boarding
6.6Food
8.1Crew
7.1Entertainment
Airline reviews

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

2.0 MediocreBrant, Apr 2025YHZ - EWR
Read more United Airlines reviews

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

leg space better than expected. two washrooms for one plane isn't enough.

Plane temperature was comfortable (not to hot) when boarding and waiting for takeoff.

Michael, our FA was very attentive, even finding me a chocolate brownie from economy class when the dessert selections were all dairy based. ( intolerant, not allergic so don’t usually need to order dairy free)

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

It was my first time with United Airlines and I would say it was very good experience and best of all the flights were on time. Will definitely fly with United Airlines next time.

headphone jack didnt work for the first flight and not much variety

The seats on this flight were almost roomy enough to be the basic amount needed for human existence. I think my favorite part of this flight was it landed at an A gate, which was the most palatial part of Sea-Tac I've ever seen - a massive improvement from the S gates.

The seats on this flight were almost roomy enough to be the basic amount needed for human existence.

Internet on both flights was sketchy. Thus in flight entertainment was non- existent on MN - Balrimote leg.

We never had an experience they canceled the flight and they did not offer us an alternative flight. I had to book one on my own expense. They offered us food voucher and we could not use them at the airport it kept saying not attached to an existing flight. The people at the counter were rude and cold and they did not care about our situation

It took 30 minutes to check in with the Westjet rep. They didn’t have enough seats and she needed to make a call… I am always “randomly” selected to be checked at security. Their “randomly “ selection system may need some updating. They treat people like criminals. It is not appropriate behavior.

Found the seats very crowded—too close together ! And waited a long time for our luggage All staff at both ends were excellent!!!

Flight cancelled and Kayak switched our return flight to a red eye. Ridiculous.

Will never book through you again. Very disappointed in the notices and action taken or provided when planes are rescheduled, enough to cause missed connections

Lost my luggage. Filed a report and there is no response. Received a phone call from another airline that said they had the bag and they did not know what to do with it

Very good over all , would have been nice to have entertainment on the flight

Absolutely the worst airline I have ever taken. They lost my baggage and told me my bag tags had been cancelled. When my bags arrived days later I had to pick them up at 3:15 am. My return flight was delayed another 6 hours and they broke my bag. Westjet does nothing to try and make it a better customer experience and all the customers services representatives I spoke with were useless and incompetent. Never flying westjet again.

Easy self checkin and baggage drop. No in seat entertainment, but wifi and app worked well

My flight got delayed 5 times and then got cancelled eventually, I had to get a hotel and uber and pay for food for an extra night without any plans. It was a horrible experience, instead of Air Canada, I was flying with United .

I had a nice flight with free wifi. So I was able to message family members and stream music during my flight, which made the trip go by fast. I also enjoyed flying on there Airbus A220. The plane looked very new and it also got up to speed fast down the runway and didn't need much runway to get airborne.

Overall good experience. The flight from Toronto to Denver does not have entertainment - movies to watch.

Boarding was challenging as we had to use the stairs from the tarmac. Stairs are okay but a roller bag makes it challenging.

Ensure prepaid food arrangements are appropriately understood by flight crew of who purchased and who did not

All was fine. Weather was a bit stormy, but nothing kayak can do about that! 😊

I paid for a comfort class seat and was seated in economy.

My plane was cancelled and had to be rebook for the evening was not happy.

The flight was cancelled and we had to rebook on Porter to make our cruise the next day. Air Canada has not compensated. We won’t be flying with them again. This is the second time this has happened. Also the return flight was delayed 2 hours who knows why.

Separated me and my wife and wife’s sister in far apart different seats even though I booked them all together. Just scams after scams to make us pay more. Worst airline

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

Information on your arrival and departure airports

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