SEA - YXU

$188 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 3/16. 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

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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 Flight Deals 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.

Recent round-trip flight deals from Seattle to London

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Seattle to London.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
8:59 pm - 7:13 pmSEA-YXU
19h 14m2 stops
8:00 pm - 2:21 pmYXU-SEA
21h 21m1 stop
Tue, Mar 11 - Tue, Mar 18
3:15 pm - 7:13 pmSEA-YXU
24h 58m1 stop
8:00 pm - 2:21 pmYXU-SEA
21h 21m1 stop
$427WestJet
Find Deal
Tue, Mar 11 - Tue, Mar 18
12:41 pm - 7:13 pmSEA-YXU
27h 32m3 stops
8:00 pm - 2:21 pmYXU-SEA
21h 21m1 stop
Tue, Mar 11 - Tue, Mar 18
3:39 pm - 5:14 amSEA-YXU
10h 35m2 stops
6:00 am - 1:08 pmYXU-SEA
10h 08m1 stop
$430WestJet
Find Deal
Sat, May 31 - Sat, Jun 7
3:39 pm - 5:14 amSEA-YXU
10h 35m2 stops
8:00 pm - 12:31 pmYXU-SEA
19h 31m2 stops
$435WestJet
Find Deal
Sat, May 31 - Sat, Jun 7
6:05 am - 8:20 pmSEA-YXU
11h 15m1 stop
5:15 am - 2:30 pmYXU-SEA
12h 15m2 stops
$440Air Canada
Find Deal
Sun, Mar 16 - Sun, Mar 23
7:05 am - 7:09 pmSEA-YXU
9h 04m1 stop
8:00 pm - 1:08 pmYXU-SEA
20h 08m1 stop
$444WestJet
Find Deal
Sat, May 31 - Sat, Jun 7
6:05 am - 8:20 pmSEA-YXU
11h 15m1 stop
3:20 pm - 9:30 pmYXU-SEA
9h 10m1 stop
$464United Airlines
Find Deal
Sun, Mar 16 - Sun, Mar 23
5:00 am - 8:20 pmSEA-YXU
12h 20m2 stops
5:15 am - 9:15 pmYXU-SEA
19h 00m3 stops
$467United Airlines
Find Deal
Tue, Mar 11 - Tue, Mar 18
3:05 pm - 9:15 amSEA-YXU
15h 10m3 stops
5:15 am - 6:25 pmYXU-SEA
16h 10m3 stops
$930Air Canada
Find Deal
Sat, Mar 15 - Sat, Mar 22

Flights from Seattle to London - Travel Insights & Trends

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

$188
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 $188 for a one-way ticket and $385 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, and SkyTeam are the airline alliances operating flights between Seattle and London, with Star Alliance being the most commonly used for this route.

  • 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 8638 reviews
7.0Comfort
6.8Entertainment
7.3Boarding
6.2Food
7.8Crew
Airline reviews

Everything was good till we got to yyz...then we got to the gate and there was NO GATE AGENT. We waited 15 min before disembarking. No internet No IFE Old aircraft Second leg in two weeks NOT IMPRESSED

8.0 ExcellentAnonymous, Jan 2025LGA - YYZ
Read more Air Canada reviews

Everything was good till we got to yyz...then we got to the gate and there was NO GATE AGENT. We waited 15 min before disembarking. No internet No IFE Old aircraft Second leg in two weeks NOT IMPRESSED

The flight was delayed at the last moment quoting an absurd weather reason. This delay led to an issue with my connecting flight. I was made to run (literary) from this flight to the next one ( as they preponed departure. I was still in my DCA to YYZ flight when the boarding started for the next connecting flight. After my sprint to get the connecting flight, found that no place for my carry on. Had to sit for 3 hours with my back-pack on my lap , it was the most uncomfortable and inconvenient journey with little to no empathy shown by cabin crew in both flights. Another poor show from Air Canada!! Cant help because of lack of options !!

I was not even asked if I want some water. Joke. Steward gave me a biscuit cover in chocolate and did not even look at me.

Ok Did not like that the second leg of flight was moved earlier making it a rush to make

Overall it was great! Seats were comfortable. We were offered snack and drink on the way to Florida but only a drink coming back. Free messaging for aero plan members was a great feature to have on board so we can connect with loved ones … entertainment like movies and shows was also a good selection!

The problem in part was with the airports, not really the fault of Air Canada. Confusing directions regarding the gate, in Seattle the recommended shuttle train entrance was not working. Simular problems in Toronto. Baggage arrived in good time. Marx Bros movie on entertainment from Seattle. I was told I was laughing too loudly, by the flight attendant. No lounge in Seattle. Lounge in Toronto excellent.

Made me check my carry on despite there being dozens of empty bins when I boarded which significantly inconvenienced me.

I arrived for my flight and was told I was now on standby as my assigned seat when I purchased my ticket was just deemed unusable 15 mins ago. My parents had to wait and hour and a half at the airport to see if I’d get in the plane. Finally when all passengers had boarded the plane I was finally told they did have another seat for me. When I boarded I saw someone else sitting in my originally assigned seat. It was in the emergency exit row and has extra leg room. I have sat in this row many times and am able to help in an emergency so no reason for me to have been kicked out of this seat. The new seat I was assigned had no padding and was extremely uncomfortable. Upon landing my back was very sore and I will probably need to see a massage therapist to help ease the tension. There was no tv or way to charge my phone on the plane. Worst flight I’ve taken in a while by far.

My wife was in a wheelchair. Most accommodating and kind staff!

The flight was delayed 2 times. The 2nd time with no knowledge of why.

Traveling to a place near London?

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

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