SEA - YXU

$283 Find Cheap Flights from Seattle to London

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to London departing on 3/2. 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
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$283
Air Canada
Mon 3/2Wed 3/4
SEA - YXU • 2 stops
Cheapest one-way
Multiple Airlines
Thu 10/30
SEA - YXU • multi-stop
Top airlines
Air Canada
Cheapest • from $283 (round-trip)
Air Canada
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Seattle to London (SEA-YXU)

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

Mon, Mar 2 - Wed, Mar 4
Air Canada Logo
8:00 pm - 8:46 amSEA-YXU
9h 46m2 stops
Air Canada Logo
5:40 pm - 10:16 pmYXU-SEA
7h 36m1 stop
$283Air Canada
Find Deal
Mon, Mar 2 - Wed, Mar 4
Air Canada Logo
8:00 pm - 8:46 amSEA-YXU
9h 46m2 stops
Air Canada Logo
5:15 am - 3:01 pmYXU-SEA
12h 46m2 stops
$288Air Canada
Find Deal
Mon, Mar 2 - Wed, Mar 4
Air Canada Logo
8:10 am - 9:21 pmSEA-YXU
10h 11m1 stop
Air Canada Logo
5:40 pm - 10:16 pmYXU-SEA
7h 36m1 stop
$301Air Canada
Find Deal
Mon, Mar 2 - Wed, Mar 4
United Airlines Logo
7:00 am - 9:21 pmSEA-YXU
11h 21m2 stops
United Airlines Logo
5:15 am - 6:03 pmYXU-SEA
15h 48m3 stops
$394United Airlines
Find Deal
Fri, Dec 12 - Fri, Dec 19
Air Canada Logo
8:00 pm - 8:46 amSEA-YXU
9h 46m2 stops
Air Canada Logo
9:25 am - 10:16 pmYXU-SEA
15h 51m1 stop
$623Air Canada
Find Deal
Tue, Nov 25 - Tue, Dec 2
United Airlines Logo
5:05 am - 5:05 pmSEA-YXU
9h 00m2 stops
United Airlines Logo
5:40 pm - 10:16 pmYXU-SEA
7h 36m1 stop
$664United Airlines
Find Deal
Tue, Nov 25 - Tue, Dec 2
United Airlines Logo
8:10 am - 9:21 pmSEA-YXU
10h 11m1 stop
United Airlines Logo
5:40 pm - 10:16 pmYXU-SEA
7h 36m1 stop
$677United Airlines
Find Deal
Tue, Nov 25 - Tue, Dec 2
WestJet Logo
3:10 pm - 7:12 pmSEA-YXU
25h 02m1 stop
WestJet Logo
8:10 pm - 2:35 pmYXU-SEA
21h 25m1 stop
$736WestJet
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Tue, Nov 25 - Tue, Dec 2
WestJet Logo
5:35 pm - 7:12 pmSEA-YXU
22h 37m2 stops
WestJet Logo
8:10 pm - 2:35 pmYXU-SEA
21h 25m1 stop
$838WestJet
Find Deal
Tue, Nov 25 - Tue, Dec 2
WestJet Logo
5:35 pm - 7:12 pmSEA-YXU
22h 37m2 stops
WestJet Logo
8:10 pm - 8:40 amYXU-SEA
15h 30m2 stops
$968WestJet
Find Deal
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.

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 Tuesday. On your return trip to Seattle, you should consider flying back on a Saturday, and avoid Mondays for better deals.

Good to know

Cheapest flight$283
Flight from Seattle to London

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 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 Seattle to London

  • 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 $283 for a round-trip ticket.

  • Do I need a passport to fly between Seattle and London?

    Yes

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

    Seattle and London are both served by 1 main airport. You will leave Seattle from Seattle/Tacoma Intl and will be arriving at London.

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

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

  • Which airline alliances offer flights from Seattle to London?

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

  • 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 round-trip ticket. You could then fly to London with an airline and back to Seattle with another airline. Booking your flights between Seattle and YXU can sometimes prove cheaper using this method.

  • 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.

Reviews of the top airline 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.
7.1
Air CanadaOverall score based on 10372 reviews
6.8Entertainment
7.3Boarding
6.3Food
7.8Crew
7.1Comfort
Airline reviews

I would like to get my money back. I flight was 4 hours late on the way to detroit, And same on my way back to Brussels they cancelled my flight and give me an other ticket and i had to wait 5 hours.

2.0 MediocreAnonymous, Oct 2025DTW - YYZ
Read more Air Canada reviews

I would like to get my money back. I flight was 4 hours late on the way to detroit, And same on my way back to Brussels they cancelled my flight and give me an other ticket and i had to wait 5 hours.

All attendents were very efficient, pleasant and happy. Everything went smoothly. The seats could have been wider. There could have been more free food instead of just one small bar.

My seat was one of those that couldn't recline, but the problem was that it was abnormally upright, so the headrest actually made the seat concave, which was uncomfortable and hard on my lower back. I had to ball my jacket up and use it as lumbar support. goodness I had it with me.

I liked a lot , the flight attendant so nice ,the seat very comfortable I enjoyed the flight , I will do it again with Air Canada,

Elderly female flight attendant was not customer friendly. There were only about 12 people on a regional jet that had about 60 seats. There were 8 exit row seats and none of them were taken. We attempted to sit in those seats and the flight attendant gave the standard " you didn't pay for those" so she would not allow us to move. What harm would that have caused ? They assigned seats to 5 of the 12 people in 2 rows, row 20 and 21. A simple friendly customer experience gesture of allowing us to sit in exit rows would have gone a long way in me having a very favorable impression on Air Canada. After that I have very poor impression of Air Canada and will not fly with them when I can avoid it.

Pearson Airport could not properly handle all the passengers who they needed to process in order to properly get them on board. As a result, I missed the departure of my flight from Toronto. The only saving grace is that Air Canada found a flight that only delayed me by one hour. However, this was no thanks to Pearson Airport!

Almost everything it was a “cool” ambiance but we arrived to Toronto so that it’s ok for me

The crew was really nice. The plane seats were kinda small even for a 5’6” / 158 lbs person.

Check in agent was very helpful and polite. He helped me board the earlier flight back home instead of waiting 2 hours at the airport for the next flight

extremely cramped seating... absolutely no leg room and when person in front of me reclined... I was pinned in my seat... absolutely ridiculous

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

Information on your arrival and departure airports

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