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Cheap flights from London, Ontario to Seattle from C$ 337

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 14/6. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from London, Ontario to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
6:10 a.m. - 6:45 p.m.
YXU
-
SEA
15h 35m
1 stop
WestJet Logo
7:00 a.m. - 4:45 p.m.
SEA
-
YXU
6h 45m
1 stop
C$ 340WestJet
Wed, 24 Jun - Wed, 15 Jul
WestJet Logo
5:55 p.m. - 6:45 p.m.
YXU
-
SEA
27h 50m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 353WestJet
Thu, 28 May - Tue, 2 Jun
WestJet Logo
2:40 p.m. - 9:40 a.m.
YXU
-
SEA
22h 00m
2 stops
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 606WestJet
Tue, 9 Jun - Wed, 10 Jun
Air Canada Logo
3:30 p.m. - 9:07 p.m.
YXU
-
SEA
8h 37m
1 stop
Air Canada Logo
7:20 p.m. - 9:20 a.m.
SEA
-
YXU
11h 00m
2 stops
C$ 624Air Canada
Wed, 24 Jun - Wed, 15 Jul
Air Canada Logo
9:30 a.m. - 9:08 p.m.
YXU
-
SEA
14h 38m
1 stop
Air Canada Logo
7:20 p.m. - 5:33 p.m.
SEA
-
YXU
19h 13m
2 stops
C$ 652Air Canada
Thu, 28 May - Tue, 2 Jun
Air Canada Logo
6:10 p.m. - 10:07 a.m.
YXU
-
SEA
18h 57m
2 stops
Air Canada Logo
7:20 p.m. - 9:20 a.m.
SEA
-
YXU
11h 00m
2 stops
C$ 656Air Canada
Wed, 24 Jun - Wed, 15 Jul
Air Canada Logo
3:30 p.m. - 9:08 p.m.
YXU
-
SEA
8h 38m
1 stop
Air Canada Logo
3:00 p.m. - 9:18 a.m.
SEA
-
YXU
15h 18m
2 stops
C$ 667Air Canada
Tue, 9 Jun - Wed, 10 Jun
Air Canada Logo
6:10 p.m. - 10:05 a.m.
YXU
-
SEA
18h 55m
2 stops
Air Canada Logo
3:00 p.m. - 9:18 a.m.
SEA
-
YXU
15h 18m
2 stops
C$ 692Air Canada
Tue, 9 Jun - Wed, 10 Jun
Air Canada Logo
6:10 p.m. - 10:05 a.m.
YXU
-
SEA
18h 55m
2 stops
Air Canada Logo
3:00 p.m. - 9:18 a.m.
SEA
-
YXU
15h 18m
2 stops
C$ 694Air Canada
Tue, 9 Jun - Wed, 10 Jun
Air Canada Logo
3:30 p.m. - 9:08 p.m.
YXU
-
SEA
8h 38m
1 stop
Air Canada Logo
8:00 a.m. - 9:38 p.m.
SEA
-
YXU
10h 38m
1 stop
C$ 701Air Canada
Tue, 9 Jun - Wed, 10 Jun

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Air Canada flights from London, Ontario to Seattle

Our best Air Canada deals on London, Ontario to Seattle flight tickets
Air Canada
24 Jun
YXU3:30 p.m.London
8h 37m
1 stop
SEA9:07 p.m.Seattle/Tacoma Intl
15 Jul
SEA7:20 p.m.Seattle/Tacoma Intl
11h 00m
2 stops
YXU9:20 a.m.London
C$ 624
Air Canada
28 May
YXU9:30 a.m.London
14h 38m
1 stop
SEA9:08 p.m.Seattle/Tacoma Intl
2 Jun
SEA7:20 p.m.Seattle/Tacoma Intl
19h 13m
2 stops
YXU5:33 p.m.London
C$ 652
Air Canada
24 Jun
YXU6:10 p.m.London
18h 57m
2 stops
SEA10:07 a.m.Seattle/Tacoma Intl
15 Jul
SEA7:20 p.m.Seattle/Tacoma Intl
11h 00m
2 stops
YXU9:20 a.m.London
C$ 656

United Airlines flights from London, Ontario to Seattle

Our best United Airlines deals on London, Ontario to Seattle flight tickets
United Airlines
20 Jun
YXU3:30 p.m.London
8h 37m
1 stop
SEA9:07 p.m.Seattle/Tacoma Intl
25 Jun
SEA5:00 p.m.Seattle/Tacoma Intl
18h 57m
2 stops
YXU2:57 p.m.London
C$ 720
United Airlines
9 Jun
YXU5:10 a.m.London
21h 22m
3 stops
SEA11:32 p.m.Seattle/Tacoma Intl
10 Jun
SEA5:15 p.m.Seattle/Tacoma Intl
18h 43m
2 stops
YXU2:58 p.m.London
C$ 811
United Airlines
9 Jun
YXU5:10 a.m.London
21h 22m
3 stops
SEA11:32 p.m.Seattle/Tacoma Intl
10 Jun
SEA5:00 p.m.Seattle/Tacoma Intl
18h 58m
2 stops
YXU2:58 p.m.London
C$ 870

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 4 May 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

Wed 24/6

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

1 stop15h 35m

Seattle/Tacoma Intl

Wed 15/7

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

1 stop6h 45m

C$ 340

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 28/5

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

1 stop27h 50m

Seattle/Tacoma Intl

Tue 2/6

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

1 stop6h 45m

C$ 353

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 9/6

2:40 p.m.-9:40 a.m.

2 stops22h 00m

Seattle/Tacoma Intl

Wed 10/6

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

1 stop6h 45m

C$ 606

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 24/6

3:30 p.m.-9:07 p.m.

1 stop8h 37m

Seattle/Tacoma Intl

Wed 15/7

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

2 stops11h 00m

C$ 624

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 28/5

9:30 a.m.-9:08 p.m.

1 stop14h 38m

Seattle/Tacoma Intl

Tue 2/6

7:20 p.m.-5:33 p.m.

2 stops19h 13m

C$ 652

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 24/6

6:10 p.m.-10:07 a.m.

2 stops18h 57m

Seattle/Tacoma Intl

Wed 15/7

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

2 stops11h 00m

C$ 656

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 9/6

3:30 p.m.-9:08 p.m.

1 stop8h 38m

Seattle/Tacoma Intl

Wed 10/6

3:00 p.m.-9:18 a.m.

2 stops15h 18m

C$ 667

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 9/6

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

2 stops18h 55m

Seattle/Tacoma Intl

Wed 10/6

3:00 p.m.-9:18 a.m.

2 stops15h 18m

C$ 692

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 9/6

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

2 stops18h 55m

Seattle/Tacoma Intl

Wed 10/6

3:00 p.m.-9:18 a.m.

2 stops15h 18m

C$ 694
Quickest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 9/6

3:30 p.m.-9:08 p.m.

1 stop8h 38m

Seattle/Tacoma Intl

Wed 10/6

8:00 a.m.-9:38 p.m.

1 stop10h 38m

C$ 701

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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?

Air Canada, 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 41% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 6 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 38m

Direct flights

None
The fastest flight from London, Ontario to Seattle takes 8h 38m
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 38m.

  • 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$ 268Free CancellationRating
7.2
3,331 reviews
Search WestJet flights
Air CanadaPriceFrom C$ 363Free CancellationRating
7.1
10,995 reviews
Search Air Canada flights

Travelling to a place near Seattle?

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

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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