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SEA - YXU

$274 Find cheap flights from Seattle to London, Ontario

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 6/15. 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
Tue 6/4
Tue 6/11

Search 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
In the last 7 days travelers have searched 43,369,418 times on KAYAK, and here is why:

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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.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
11:10 pm - 9:15 amSEA-YXU
7h 05m1 stop
3:20 pm - 9:58 pmYXU-SEA
9h 38m1 stop
$534Air Canada
Find Deal
Sun, Aug 25 - Tue, Aug 27
5:50 am - 5:45 pmSEA-YXU
8h 55m2 stops
6:00 am - 10:51 amYXU-SEA
7h 51m1 stop
$539Air Canada
Find Deal
Sun, Aug 25 - Tue, Aug 27
7:05 pm - 9:15 amSEA-YXU
11h 10m2 stops
6:00 am - 12:30 pmYXU-SEA
9h 30m2 stops
$544Air Canada
Find Deal
Sun, Aug 25 - Tue, Aug 27

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 flights from Seattle to London, Ontario clicked on KAYAK for each day over the last 12 months.
For Seattle to London, Monday is the cheapest day to fly on average and Wednesday is the most expensive. Flying from London back to Seattle, the best deals are generally found on Tuesday, with Sunday being the most expensive.

Good to know

Cheapest flight

$274
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, Ontario?

    In the last 3 days, the lowest price for a flight from Seattle to London, Ontario was $274 for a one-way ticket and $534 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 6904 reviews
7.2Boarding
6.8Entertainment
7.0Comfort
7.8Crew
6.2Food
Airline reviews

You do not have a space for flight cancelled. BUT!!! Air Canada handled it great. Was booked on another airline for the next day. The original flight was booked solid. But he precheck by the maintenance found a mechanical problem and the plane was not safe to fly. It was an inconvenience to have to wait until next day but I would rather arrive safely.

4.0 OkayAnonymous, May 2024CLT - YYZ
Read more about Air Canada reviews

You do not have a space for flight cancelled. BUT!!! Air Canada handled it great. Was booked on another airline for the next day. The original flight was booked solid. But he precheck by the maintenance found a mechanical problem and the plane was not safe to fly. It was an inconvenience to have to wait until next day but I would rather arrive safely.

Very good other than we have to wait for one crew and we’re delayed and the pilot and his co- pilot has to make a difference to be right on time arrival. Disappointed about no food service also.

I had written all my complaints on my trip from Grand Junction to Denver so I will repeat it here! I was absolutely appalled that I had to pay for a regular seat that I choose 24 hrs before boarding! Also I checked my large bag which I had to pay for as well, and by the time I boarded all the room in the bins were gone so also had to check that one. I noticed people pulling out oversized suitcases, bigger than the measurements stated for carry on, and also large pack packs stuffed full! So these people were taking up 2 or 3 spaces that the rest of us should have been able to use but couldn’t! NoTV on the flight! Thankfully I had downloaded the United Airlines app and was able to watch movies on my phone. Don’t remember the last time I flew in a plane with no movie screens!

The crew was friendly, the seats are too small. Air travel is barely tolerable anymore.

Food was icecold or frozen including breakfast. Hopeless service. Rude crew.

The flight was very uncomfortable and there was no snacks served for the 13 hours international flight. In addition, the flight was delayed 3 hours

Due to a strike taking place with the airline, it negatively impacted my flight in multiple ways. My flight was delayed over 2 hours and the food served was mediocre at best.

Cabin crew were great. Seats are criminal for tall people

My flight was great! Gate attendants and crew were great… pleasant and in good spirits. Flight delayed several hours and we were well informed of the status while on plane. Thank you!

The fact that I got to Toronto alive and well and safe is a huge plus. I thank the captain and crew for a safe flight The comfort of the aircraft leaves much to be desired. Human beings should not have to be that cramped and squashed on a flight that we pay a lot for and even have to pay for lousy food choices The cabin crew were pleasant and helpful Kudos to them as the flight was packed to capacity and there was a lot of work for them in a short space of time All in all a good experience, but too cramped

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.
6/15Sat
1 stopAir Canada
12h 36mSEA-YXU
$274
6/15Sat
2 stopsAir Canada
16h 41mSEA-YXU
$279

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Last minute flights from Seattle to London

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Seattle to London that are departing in the next 10 days.
5/6Mon
multi-stopWestJet
26h 23mSEA-YXU
5/11Sat
multi-stopWestJet
19h 56mYXU-SEA
$724
5/6Mon
multi-stopWestJet
26h 23mSEA-YXU
5/11Sat
multi-stopWestJet
14h 56mYXU-SEA
$835
5/6Mon
multi-stopWestJet
20h 43mSEA-YXU
5/11Sat
multi-stopWestJet
14h 56mYXU-SEA
$1,110
5/5Sun
multi-stopAir Canada
6h 56mSEA-YXU
5/11Sat
multi-stopAir Canada
9h 33mYXU-SEA
$1,113
5/5Sun
multi-stopWestJet
42h 53mSEA-YXU
5/10Fri
multi-stopWestJet
19h 56mYXU-SEA
$1,115
5/5Sun
multi-stopAir Canada
11h 11mSEA-YXU
5/11Sat
multi-stopAir Canada
14h 41mYXU-SEA
$1,123

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Seattle - London Flights

Departure:

Seattle (SEA)United States

Destination:

London (YXU)Canada

Return flight deals:

London - Seattle

Cabin classes: