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YXU - SEA

C$ 512 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
Sat 29/6
Sat 6/7

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 42,686,544 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$ 512WestJet
Find Deal
Tue, 16 Jul - Tue, 23 Jul
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$ 550WestJet
Find Deal
Fri, 19 Jul - Sat, 27 Jul
6:00 a.m. - 10:51 a.m.YXU-SEA
7h 51m1 stop
7:05 p.m. - 9:15 a.m.SEA-YXU
11h 10m2 stops
C$ 562Air Canada
Find Deal
Tue, 16 Jul - Tue, 23 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$ 575Air Canada
Find Deal
Thu, 27 Jun - Thu, 4 Jul
3:20 p.m. - 9:58 p.m.YXU-SEA
9h 38m1 stop
3:10 p.m. - 9:15 a.m.SEA-YXU
15h 05m2 stops
C$ 618
Find Deal
Thu, 27 Jun - Thu, 4 Jul
8:00 p.m. - 7:30 a.m.YXU-SEA
38h 30m2 stops
3:30 p.m. - 5:18 a.m.SEA-YXU
10h 48m2 stops
C$ 746WestJet
Find Deal
Thu, 27 Jun - Thu, 4 Jul
6:00 a.m. - 12:30 p.m.YXU-SEA
9h 30m2 stops
7:05 p.m. - 9:15 a.m.SEA-YXU
11h 10m2 stops
C$ 809Air Canada
Find Deal
Tue, 16 Jul - Tue, 23 Jul
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$ 811WestJet
Find Deal
Thu, 27 Jun - Thu, 4 Jul
8:00 p.m. - 5:21 p.m.YXU-SEA
24h 21m1 stop
3:30 p.m. - 5:18 a.m.SEA-YXU
10h 48m2 stops
C$ 892WestJet
Find Deal
Thu, 27 Jun - Thu, 4 Jul
8:00 p.m. - 8:09 p.m.YXU-SEA
27h 09m3 stops
3:30 p.m. - 5:18 a.m.SEA-YXU
10h 48m2 stops
C$ 1,141
Find Deal
Thu, 27 Jun - Thu, 4 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$ 480 on average. On the other hand, the most expensive months are April and September, where the average cost of tickets is C$ 1,141 and C$ 889 respectively.

Good to know

Low season

March

High season

August

Cheapest flight

C$ 512
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$ 374 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$ 674 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$ 636 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 2866 reviews
6.4Food
6.4Entertainment
7.7Boarding
7.3Comfort
8.1Crew
Airline reviews

Terrible! Delayed three times, landed at some corner of airport, walked in bitter cold night, took a bus, bad experience

2.0 MediocreAnonymous, May 2024YYC - SEA
Read more about WestJet reviews

Terrible! Delayed three times, landed at some corner of airport, walked in bitter cold night, took a bus, bad experience

It was very, very cold extremely uncomfortable almost unbearable I was sitting at the front of the cabin

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.

The Carry-on luggage that approved by TSA and all other airlines,- always an issue with Air Canada. This is inappropriate as my carry on suitcase meets the requirements however it always asked to check in on AC flight on the gate. Yes I have it for free, but it takes extra time to pick up on the carousel. Apparently it fit the overhead space, so why AC has this issue all the time?

The terminal this flight boarded from was so far away, poorly temperature controlled, and generally uncomfortable. The plane was small but the flight was short, so it wasn't so bad.

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.

London - Seattle Flights

Departure:

London (YXU)Canada

Destination:

Seattle (SEA)United States

Return flight deals:

Seattle - London

Cabin classes: