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Cheap flights from London, Ontario to Seattle from C$ 304

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London, Ontario to Seattle departing on 11/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from London, Ontario to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
5:55 p.m. - 6:45 p.m.
YXU
-
SEA
27h 50m
1 stop
WestJet Logo
7:00 a.m. - 4:45 p.m.
SEA
-
YXU
6h 45m
1 stop
C$ 556WestJet
Thu, 16 Jul - Thu, 23 Jul
WestJet Logo
5:55 p.m. - 6:45 p.m.
YXU
-
SEA
27h 50m
1 stop
WestJet Logo
7:00 a.m. - 4:45 p.m.
SEA
-
YXU
6h 45m
1 stop
C$ 560WestJet
Sat, 5 Sep - Mon, 7 Sep
WestJet Logo
8:40 p.m. - 9:00 p.m.
YXU
-
SEA
27h 20m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 565WestJet
Fri, 24 Jul - Sat, 1 Aug
WestJet Logo
5:55 p.m. - 9:00 p.m.
YXU
-
SEA
30h 05m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 572WestJet
Mon, 27 Jul - Mon, 17 Aug
WestJet Logo
5:55 p.m. - 9:40 a.m.
YXU
-
SEA
18h 45m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 628WestJet
Fri, 16 Oct - Tue, 20 Oct
WestJet Logo
6:10 a.m. - 6:45 p.m.
YXU
-
SEA
15h 35m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 635WestJet
Fri, 16 Oct - Tue, 20 Oct
Air Canada Logo
3:30 p.m. - 9:04 p.m.
YXU
-
SEA
8h 34m
1 stop
Air Canada Logo
5:40 a.m. - 9:40 p.m.
SEA
-
YXU
13h 00m
2 stops
C$ 676Air Canada
Fri, 16 Oct - Tue, 20 Oct
Air Canada Logo
3:30 p.m. - 9:04 p.m.
YXU
-
SEA
8h 34m
1 stop
Air Canada Logo
5:40 a.m. - 9:40 p.m.
SEA
-
YXU
13h 00m
2 stops
C$ 678Air Canada
Fri, 16 Oct - Tue, 20 Oct
Air Canada Logo
10:05 a.m. - 6:32 p.m.
YXU
-
SEA
11h 27m
2 stops
Air Canada Logo
7:20 p.m. - 9:20 a.m.
SEA
-
YXU
11h 00m
2 stops
C$ 679Air Canada
Fri, 16 Oct - Tue, 20 Oct
WestJet Logo
5:55 p.m. - 9:00 p.m.
YXU
-
SEA
30h 05m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 699WestJet
Mon, 29 Jun - Thu, 9 Jul

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WestJet flights from London, Ontario to Seattle

Our best WestJet deals on London, Ontario to Seattle flight tickets
WestJet
16 Jul
YXU5:55 p.m.London
27h 50m
1 stop
SEA6:45 p.m.Seattle/Tacoma Intl
23 Jul
SEA7:00 a.m.Seattle/Tacoma Intl
6h 45m
1 stop
YXU4:45 p.m.London
C$ 556
WestJet
5 Sep
YXU5:55 p.m.London
27h 50m
1 stop
SEA6:45 p.m.Seattle/Tacoma Intl
7 Sep
SEA7:00 a.m.Seattle/Tacoma Intl
6h 45m
1 stop
YXU4:45 p.m.London
C$ 560
WestJet
24 Jul
YXU8:40 p.m.London
27h 20m
1 stop
SEA9:00 p.m.Seattle/Tacoma Intl
1 Aug
SEA7:35 p.m.Seattle/Tacoma Intl
6h 45m
1 stop
YXU5:20 a.m.London
C$ 565

United Airlines flights from London, Ontario to Seattle

Our best United Airlines deals on London, Ontario to Seattle flight tickets
United Airlines
16 Jul
YXU10:05 a.m.London
12h 01m
2 stops
SEA7:06 p.m.Seattle/Tacoma Intl
23 Jul
SEA8:00 a.m.Seattle/Tacoma Intl
6h 42m
1 stop
YXU5:42 p.m.London
C$ 908
United Airlines
27 Jul
YXU6:20 p.m.London
18h 20m
2 stops
SEA9:40 a.m.Seattle/Tacoma Intl
17 Aug
SEA5:00 p.m.Seattle/Tacoma Intl
21h 45m
3 stops
YXU5:45 p.m.London
C$ 909
United Airlines
29 Jun
YXU10:05 a.m.London
12h 01m
2 stops
SEA7:06 p.m.Seattle/Tacoma Intl
11 Jul
SEA8:00 a.m.Seattle/Tacoma Intl
6h 42m
1 stop
YXU5:42 p.m.London
C$ 924

momondo Fare Finder

 
Customize your flight search to find flights from London, Ontario to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 96,600 searches. Data last updated 18 June 2026.
Use the filters below to find and compare flights from London, Ontario to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 16/7

5:55 p.m.-6:45 p.m.

1 stop27h 50m

Seattle/Tacoma Intl

Thu 23/7

7:00 a.m.-4:45 p.m.

1 stop6h 45m

C$ 556

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 5/9

5:55 p.m.-6:45 p.m.

1 stop27h 50m

Seattle/Tacoma Intl

Mon 7/9

7:00 a.m.-4:45 p.m.

1 stop6h 45m

C$ 560

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 24/7

8:40 p.m.-9:00 p.m.

1 stop27h 20m

Seattle/Tacoma Intl

Sat 1/8

7:35 p.m.-5:20 a.m.

1 stop6h 45m

C$ 565

LondonSeattle

YXU - SEA

YXUSEA

London

Mon 27/7

5:55 p.m.-9:00 p.m.

1 stop30h 05m

Seattle/Tacoma Intl

Mon 17/8

7:35 p.m.-5:20 a.m.

1 stop6h 45m

C$ 572

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 16/10

5:55 p.m.-9:40 a.m.

1 stop18h 45m

Seattle/Tacoma Intl

Tue 20/10

7:35 p.m.-5:20 a.m.

1 stop6h 45m

C$ 628

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 16/10

6:10 a.m.-6:45 p.m.

1 stop15h 35m

Seattle/Tacoma Intl

Tue 20/10

7:35 p.m.-5:20 a.m.

1 stop6h 45m

C$ 635
Quickest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 16/10

3:30 p.m.-9:04 p.m.

1 stop8h 34m

Seattle/Tacoma Intl

Tue 20/10

5:40 a.m.-9:40 p.m.

2 stops13h 00m

C$ 676

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 16/10

3:30 p.m.-9:04 p.m.

1 stop8h 34m

Seattle/Tacoma Intl

Tue 20/10

5:40 a.m.-9:40 p.m.

2 stops13h 00m

C$ 678

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 16/10

10:05 a.m.-6:32 p.m.

2 stops11h 27m

Seattle/Tacoma Intl

Tue 20/10

7:20 p.m.-9:20 a.m.

2 stops11h 00m

C$ 679

LondonSeattle

YXU - SEA

YXUSEA

London

Mon 29/6

5:55 p.m.-9:00 p.m.

1 stop30h 05m

Seattle/Tacoma Intl

Thu 9/7

7:35 p.m.-5:20 a.m.

1 stop6h 45m

C$ 699

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from London, Ontario to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from London to Seattle/Tacoma Intl?

WestJet and United Airlines are the most popular carriers operating from London to Seattle/Tacoma Intl

Which airlines fly to Seattle?

Alaska Airlines, Air Canada and WestJet are the top three most popular airlines that fly to Seattle from London, Ontario according to our data. Alaska Airlines is the first choice among our users, with 38% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 5 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

When to book flights from London, Ontario to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from London, Ontario to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap London, Ontario to Seattle (YXU to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London, Ontario to Seattle

Fastest flight time

8h 34m

Direct flights

None
The fastest flight from London, Ontario to Seattle takes 8h 34m
There are no direct flights from London, Ontario to Seattle. There are no popular flight routes from London, Ontario to Seattle.
Search flight deals

Frequently asked questions about flying from London, Ontario to Seattle

  • How far is London to Seattle/Tacoma Intl by plane?

    The distance between London and Seattle/Tacoma Intl is about 3215.2 km. By plane, this route typically takes 8h 34m.

  • When did momondo last update prices for flights from London Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from London Airport to Seattle/Tacoma Intl Airport were last updated today.

  • How many operators does momondo search for flights from London Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from London Airport to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from London, Ontario to Seattle?

Best airlines flying from London, Ontario to Seattle

Compare and see reviews for airlines that fly from London, Ontario to Seattle with momondo
Airline
Rating
Free Cancellation
Price
WestJetPriceFrom C$ 276Free CancellationRating
7.2
3,375 reviews
Search WestJet flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Leavenworth
Redmond
Kirkland
SeaTac
Marysville
Woodinville
Tacoma
Puyallup
Tukwila
Olympia
Ocean Shores
Ellensburg
Federal Way
Bainbridge Island
Gig Harbor
Renton
Kent
Edmonds
Shoreline

Why use momondo?

Why should I use momondo to find a flight deal from London to Seattle?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Seattle . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from London to Seattle with flexible booking policies on momondo?

Flights from London to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Seattle?

Once you have performed a search for London to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from London to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of London to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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