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SEA - YXU

$78 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 5/31. 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

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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Cheap Flights from Seattle to London

 
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.

Recent round-trip flight deals from Seattle to London

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to London.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
Air Canada Logo
11:30 am - 9:28 pmSEA-YXU
6h 58m1 stop
Air Canada Logo
6:15 am - 10:51 amYXU-SEA
7h 36m1 stop
$178Air Canada
Find Deal
Sat, May 31 - Sat, Jun 7
Air Canada Logo
11:30 am - 9:28 pmSEA-YXU
6h 58m1 stop
Air Canada Logo
9:55 am - 8:37 pmYXU-SEA
13h 42m2 stops
$180Air Canada
Find Deal
Sat, May 31 - Sat, Jun 7
Air Canada Logo
11:30 am - 9:28 pmSEA-YXU
6h 58m1 stop
Air Canada Logo
9:55 am - 8:37 pmYXU-SEA
13h 42m2 stops
$187Air Canada
Find Deal
Sat, May 31 - Sat, Jun 7
Air Canada Logo
11:30 am - 9:28 pmSEA-YXU
6h 58m1 stop
Air Canada Logo
6:15 am - 10:51 amYXU-SEA
7h 36m1 stop
$189Air Canada
Find Deal
Sat, May 31 - Sat, Jun 7
WestJet Logo
1:50 pm - 5:14 amSEA-YXU
12h 24m1 stop
WestJet Logo
6:00 am - 12:58 pmYXU-SEA
9h 58m1 stop
$192WestJet
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Sat, May 31 - Sat, Jun 7
Logo
8:10 am - 5:14 amSEA-YXU
18h 04m1 stop
Logo
6:15 am - 10:51 amYXU-SEA
7h 36m1 stop
$196
Find Deal
Sun, Jun 1 - Sun, Jun 8
Logo
8:10 am - 5:14 amSEA-YXU
18h 04m1 stop
Logo
6:15 am - 10:51 amYXU-SEA
7h 36m1 stop
$201
Find Deal
Sun, Jun 1 - Sun, Jun 8
United Airlines Logo
11:30 am - 9:28 pmSEA-YXU
6h 58m1 stop
United Airlines Logo
6:15 am - 10:51 amYXU-SEA
7h 36m1 stop
$211United Airlines
Find Deal
Sat, May 31 - Sat, Jun 7
WestJet Logo
8:10 am - 5:14 amSEA-YXU
18h 04m1 stop
WestJet Logo
8:00 pm - 12:58 pmYXU-SEA
19h 58m1 stop
$218WestJet
Find Deal
Sun, Jun 1 - Sun, Jun 8
United Airlines Logo
5:05 pm - 9:18 amSEA-YXU
13h 13m2 stops
United Airlines Logo
6:15 am - 10:45 amYXU-SEA
7h 30m1 stop
$221United Airlines
Find Deal
Wed, Apr 30 - Sat, May 3

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.
Find deals

Good to know

Cheapest flight

$78
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 $78 for a one-way ticket and $178 for a round-trip.

  • 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.

See more FAQs

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.
7.0
Air CanadaOverall score based on 9139 reviews
6.3Food
7.3Boarding
7.0Comfort
6.8Entertainment
7.8Crew
Airline reviews

Terrible experience, flight was delayed both ways. Limited compensation for the 5+ hour delay. Will not be flying Air Canada Rouge, and don’t recommend you do either.

2.0 MediocreAnonymous, Apr 2025MIA - YYZ
Read more Air Canada reviews

Terrible experience, flight was delayed both ways. Limited compensation for the 5+ hour delay. Will not be flying Air Canada Rouge, and don’t recommend you do either.

The boarding was relatively quick, the crew welcoming and flight uneventful. The omission of meals on all airlines is unacceptable especially when the flight is during a mealtime such as this one, (lunchtime), is unacceptable.

Everything was simple and easy. The lady at the gate was super friendly, I wish I had her name to share. She's a little older, dark-haired. You can tell she likes her job and would be a great influence on any young people training with her.

No Charging ports for personal electronics, which were required to use wifi entertainment.

Rushed, the boarding was a great deal like a Chinese fire drill.

it was red eye flight, it was ok, there was beverage service, thats it i didnt care much as i wanted to sleep

Everything went smoothly. I appreciate the selection of free movies.

I like the friendliness of the crew members. I think the snack could’ve been better instead of a small package of pretzel. I like that they offer me something to drink.

The TSA agents in Phoenix were incredibly rude and confiscated belongings that we wanted to check. The flight got changed without our knowledge to a worse situation. The whole thing was terrible

My experience with Air Canada was good. Great customer service… only a few delays and issues with the tunnel to exit the plain. I did not appreciate that we arrived at terminal D and had to go to terminal E to get the bags/ luggage.

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

Information on your arrival and departure airports

London (YXU)
Seattle (SEA)

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