SEA - YXU

$151 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 1/15. 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
0 bags

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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
In the last 7 days travelers have searched 41,299,237 times on KAYAK, and here is why:

Save 23% or moreCompare multiple travel sites with one search.

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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
11:30 am - 7:13 pmSEA-YXU
28h 43m2 stops
8:00 pm - 2:21 pmYXU-SEA
21h 21m1 stop
$339WestJet
Find Deal
Mon, Feb 3 - Mon, Feb 10
3:36 pm - 7:13 pmSEA-YXU
24h 37m1 stop
8:00 pm - 2:21 pmYXU-SEA
21h 21m1 stop
Mon, Feb 3 - Mon, Feb 10
11:30 am - 7:13 pmSEA-YXU
28h 43m2 stops
8:00 pm - 9:57 amYXU-SEA
16h 57m2 stops
Mon, Feb 3 - Mon, Feb 10
11:30 am - 7:13 pmSEA-YXU
28h 43m2 stops
8:00 pm - 12:19 amYXU-SEA
31h 19m3 stops
Mon, Feb 3 - Mon, Feb 10
11:30 am - 7:13 pmSEA-YXU
28h 43m2 stops
5:45 am - 2:30 pmYXU-SEA
11h 45m2 stops
Sun, Feb 2 - Sun, Feb 9
11:30 am - 7:13 pmSEA-YXU
28h 43m2 stops
3:25 pm - 9:30 pmYXU-SEA
9h 05m1 stop
Sun, Feb 2 - Sun, Feb 9
7:05 am - 7:09 pmSEA-YXU
9h 04m1 stop
8:00 pm - 1:08 pmYXU-SEA
20h 08m1 stop
$476WestJet
Find Deal
Sat, May 31 - Sat, Jun 7
6:10 am - 9:15 amSEA-YXU
24h 05m2 stops
5:10 am - 10:30 pmYXU-SEA
20h 20m2 stops
$550United Airlines
Find Deal
Thu, Jan 16 - Wed, Jan 22
7:05 pm - 9:15 amSEA-YXU
11h 10m2 stops
9:55 am - 6:27 pmYXU-SEA
11h 32m2 stops
$553Air Canada
Find Deal
Sun, Feb 2 - Sun, Feb 9
6:10 am - 9:15 amSEA-YXU
24h 05m2 stops
5:10 am - 9:20 pmYXU-SEA
19h 10m3 stops
$555United Airlines
Find Deal
Thu, Jan 16 - Wed, Jan 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 Saturday and more expensive on a Tuesday. On your return trip to Seattle, you should consider flying back on a Tuesday, and avoid Mondays for better deals.

Good to know

Cheapest flight

$151
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 $151 for a one-way ticket and $339 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?

    SkyTeam, and Star Alliance 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 8401 reviews
7.3Boarding
6.3Food
6.8Entertainment
7.0Comfort
7.8Crew
Airline reviews

Lots of announcements that no wheeled carry on bags were allowed on the flight, yet the overhead bins were totally full and made it uncomfortable trying to get through and significantly held up departure. Why were they allowed on when they said that they weren't? Trash only came by soon after service and I wasn't ready to dispose of it. I had to first hold on to it and after flagging and attendant was told to stuff it in the seat back! I have never run into the need to walk outside in northern winter weather at an international airport and wasn't dressed to do so in the cold pouring rain! I'm not thinking that I'll be back unless I hear things have changed.

2.0 MediocreLucinda, Dec 2024PHL - YYZ
Read more Air Canada reviews

Lots of announcements that no wheeled carry on bags were allowed on the flight, yet the overhead bins were totally full and made it uncomfortable trying to get through and significantly held up departure. Why were they allowed on when they said that they weren't? Trash only came by soon after service and I wasn't ready to dispose of it. I had to first hold on to it and after flagging and attendant was told to stuff it in the seat back! I have never run into the need to walk outside in northern winter weather at an international airport and wasn't dressed to do so in the cold pouring rain! I'm not thinking that I'll be back unless I hear things have changed.

The Air Canada staff at the gate in Newark were fantastic and so very helpful!!!

I booked these flights for our group of 4 people several months in advance. On the departing flight, I checked in 24 hours before flight and was able to select the seats that we liked. On the return flight, I had no internet access until about 12 hours before flight, when I tried to check in, we were scattered all over the plane in middle seats which is absolutely ridiculous. I book all 4 ticket in 1 booking MONTHS in advance, the preassigned seats should be together, NOT scattered in 4 different rows in middle seats.

On the short flight it was fine . The flight was smooth and crew pleasant .

The fact that we have to check in our carryons when we met the requirements and there was plenty of spaces near we sat was ridiculous

From charlotte to Toronto was not good From Toronto to Dubai was very good

Your survey should include a "Not Applicable" response for those elements that were not utilized, such as food (unless your want me to rate the cookie I received) and the entertainment (unless you want me to rate the emergency landing presentation). Boarding was late, the plane took-off almost an hour late, and the gate to board changed five times while I was waiting there. At 1:00 pm the plane had not yet approached the gate for passengers to load, yet the information board indicated that the take-off would be 12:30 pm and its status was "on time". Curious.

Republic was fine but Air Canada was terrible in the airport. They issues me a boarding pass that I placed in my wallet and then when I showed up at the airport they had taken the bar code away from the ticket because they changed the flight number even though the flight stayed the same time. This caused me to be unable to go through security and I had to go to Air Canada for help and they were horrible and almost caused me to miss my flight. Luckily I managed to get it figured out on my own phone, not the kiosks, or the agent I asked for help or the long line I was standing in!!

Unfortunately your planes need maintenance. I am surprised your bathroom in business class was not working in 8 hour flight. Coffee machine was broken. Seat adjustment panel was bad. I will stay away from Air Canada in future travel.

Problem with operation of on board entertainment computer. Failed about 1 /2 hour into the flight. Rebooting failed to restore.

Book cheap flights from Seattle to London

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Seattle to London found on KAYAK in the last 72 hours.
1/15Wed
2 stops
26h 17mSEA-YXU
$151
2/3Mon
3 stopsWestJet
28h 43mSEA-YXU
$188
2/3Mon
2 stops
18h 21mSEA-YXU
$191
4/28Mon
1 stopDelta
9h 04mSEA-YXU
$241
4/28Mon
2 stopsUnited Airlines
23h 58mSEA-YXU
$243
2/2Sun
2 stopsWestJet
28h 43mSEA-YXU
$245
1/15Wed
3 stopsUnited Airlines
20h 55mSEA-YXU
$253
4/27Sun
2 stopsDelta
19h 54mSEA-YXU
$269
1/15Wed
1 stopAir Canada
11h 15mSEA-YXU
$274
1/4Sat
1 stopAir Canada
11h 15mSEA-YXU
$611

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

Information on your arrival and departure airports

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