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YXU - SEA

C$ 508 Find cheap flights from London, Ontario to Seattle

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Seattle departing on 16/7. 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
Sun 16/6
Sun 23/6

Search hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, 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 London to Seattle, as well as popular online travel agencies
In the last 7 days, travellers have searched 42,332,103 times on KAYAK, and here is why:

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Cheap flight deals from London to Seattle (YXU-SEA)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from London to Seattle 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
6:15 a.m. - 12:56 p.m.YXU-SEA
9h 41m1 stop
7:00 a.m. - 6:59 p.m.SEA-YXU
8h 59m1 stop
C$ 508WestJet
Find Deal
Tue, 16 Jul - Tue, 23 Jul
6:15 a.m. - 12:56 p.m.YXU-SEA
9h 41m1 stop
7:00 a.m. - 6:59 p.m.SEA-YXU
8h 59m1 stop
C$ 509WestJet
Find Deal
Tue, 16 Jul - Tue, 23 Jul
8:00 p.m. - 8:21 p.m.YXU-SEA
27h 21m1 stop
7:00 a.m. - 6:59 p.m.SEA-YXU
8h 59m1 stop
C$ 538WestJet
Find Deal
Sun, 21 Jul - Sun, 4 Aug
8:00 p.m. - 5:21 p.m.YXU-SEA
24h 21m1 stop
6:15 p.m. - 5:18 a.m.SEA-YXU
8h 03m1 stop
C$ 546WestJet
Find Deal
Fri, 19 Jul - Sat, 27 Jul
3:20 p.m. - 9:58 p.m.YXU-SEA
9h 38m1 stop
11:40 a.m. - 9:35 p.m.SEA-YXU
6h 55m1 stop
C$ 553Air Canada
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Fri, 19 Jul - Sat, 27 Jul
6:00 a.m. - 2:34 p.m.YXU-SEA
11h 34m2 stops
11:40 a.m. - 9:35 p.m.SEA-YXU
6h 55m1 stop
C$ 560Air Canada
Find Deal
Tue, 16 Jul - Tue, 23 Jul
6:15 a.m. - 5:21 p.m.YXU-SEA
14h 06m1 stop
9:13 p.m. - 5:18 a.m.SEA-YXU
29h 05m3 stops
C$ 816
Find Deal
Sat, 20 Jul - Sat, 20 Jul
6:15 a.m. - 2:46 p.m.YXU-SEA
11h 31m2 stops
5:10 a.m. - 6:59 p.m.SEA-YXU
34h 49m3 stops
C$ 832
Find Deal
Sun, 21 Jul - Sun, 4 Aug
3:20 p.m. - 11:35 a.m.YXU-SEA
23h 15m3 stops
11:59 p.m. - 2:45 p.m.SEA-YXU
11h 46m2 stops
C$ 907United Airlines
Find Deal
Tue, 16 Jul - Tue, 23 Jul
6:00 a.m. - 10:51 a.m.YXU-SEA
7h 51m1 stop
12:30 a.m. - 2:45 p.m.SEA-YXU
11h 15m2 stops
C$ 1,043United Airlines
Find Deal
Tue, 16 Jul - Mon, 22 Jul

Flights from London to Seattle - Travel Insights & Trends

Get data-powered insights and trends into flights from London to Seattle to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from London, Ontario to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from London, Ontario to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from London, Ontario to Seattle is June, where tickets cost C$ 478 on average. On the other hand, the most expensive months are April and September, where the average cost of tickets is C$ 1,136 and C$ 885 respectively.

Good to know

Low season

March

High season

August

Cheapest flight

C$ 508
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly and prices are also 17% lower on average.
Flight from London to Seattle

When to book flights from London to Seattle

Are your dates flexible? Find out the best times to travel from London to Seattle 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 London to Seattle

  • What is the cheapest flight from London, Ontario to Seattle?

    In the last 3 days, the lowest price for a flight from London, Ontario to Seattle was C$ 373 for a round-trip ticket.

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

    London airport is called London and the only airport in Seattle is Seattle/Tacoma Intl.

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

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

  • Which airline alliances offer flights from London to Seattle?

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

  • Which is the best airline for flights from London to Seattle, WestJet or Air Canada?

    The two airlines most popular with KAYAK users for flights from London to Seattle are WestJet and Air Canada. With an average price for the route of C$ 669 and an overall rating of 7.5, WestJet is the most popular choice. Air Canada is also a great choice for the route, with an average price of C$ 629 and an overall rating of 7.0.

  • How does KAYAK find such low prices on flights from London to Seattle?

    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 London to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from London 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 London to Seattle?

    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 Seattle with an airline and back to London with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to Seattle?

    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 Seattle from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top airlines flying from London to Seattle

 
See real verified KAYAK customer reviews for airlines flying from London to Seattle. 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 London to Seattle? 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.
7.5
WestJetOverall score based on 2906 reviews
7.3Comfort
6.5Entertainment
7.7Boarding
8.2Crew
6.5Food
Airline reviews

Too many oversized carryon baggage. If carrier reduced checked luggage fee this could be avoided. The staff were friendly and helpful, very professional.

8.0 ExcellentRoy, May 2024YQT - YWG
Read more about WestJet reviews

Too many oversized carryon baggage. If carrier reduced checked luggage fee this could be avoided. The staff were friendly and helpful, very professional.

Nice smooth flight with pleasant stewards. Slept most of the flight, they could have slowly turned on the lights to make it more pleasant. Otherwise a good trip.

Great! No food was available during the flight due to the catering service strike but snacks were given throughout the flight which was nice.

I wish that seats closer to the front of the plan were available, but when I booked the flight the seats were VERY expensive so I did not book seats at that time. The day before flying only seats at the back of the plane were available. It takes so long to board the plane and empty the plane on arrival due to SO many roller bags.

Crew was rude.didn’t even say hi or welcome to board

Nothing special. Unacceptable wait for baggage on arriving in Calgary

Departure delay on a late night flight. Made us even later. Tired but got home.

Westjet forced me to put my carry-on baggage in check-in probably because I was assigned seat 23A (the last row seat), which had no cabin space, which is unfair. I wanted to carry on my luggage so that I don't have to wait at the airport for my luggage. Also, because there was no cabin space, I was forced to keep my laptop bag under the seat, which I didn't want to as I was carrying 2 laptops and charger. The airline should basically tell people that if you are assigned a last row seat, then you are not allowed a cabin baggage or a personal item.

Easy processing, flight time was quick and staff was professional and kind.

It was delayed by two ours very full no room to move

Seriously need to improve the time schedule and the plans

Great TV, easy boarding, wonderful ground crew and flight crew.

Rude Customer Service at checkin, 90 minute limit in flight check in is too strict. I was in line for 30 minutes because of slow/insufficient workers. Somewhere I got to the the counter of course the employee warned me about the 90 minutes. People were cutting the lines. No one did anything.

Overall, I would have to say my experience with Air Canada was mediocre their DC tens. Need to be updated not comfortable at all. Only one out of my four flights was decent. The staffing was very nice. Going through customs in Montreal was quick and easy. Air Canada has room for improvement with their facilities.

Everything was great. I really like how they had their safety film set up showing you the beauty of the country.

I liked the early check in. Flight was a bit bumpy due yo weather. Overall, everything went well.

Limited snack options cause the snack vendor was on strike

It was an excellent experience, traveling from Toronto to Denver with United.

Ontime boarding. Almost 1 hour take off delay. We could have boarded slightly later since the pilots were in traffic

This was the first AC flight in a long time that we experienced no delays or frustrations. The gate attendant was extremely polite and accommodating to my husband who has Parkinson’s disease which made boarding extremely stress free. Flight departed ON TIME and was a smooth ride. If only all my AC experiences could be like this.

London - Seattle Flights

Departure:

London (undefined)Canada

Destination:

Seattle (SEA)United States

Return flight deals:

Seattle - London

Cabin classes: