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Cheap flights from London, Ontario to Seattle from C$ 357

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from London, Ontario to Seattle departing on 7/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London, Ontario to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
5:40 p.m. - 10:16 p.m.YXU-SEA
7h 36m1 stop
Air Canada Logo
8:10 a.m. - 9:21 p.m.SEA-YXU
10h 11m1 stop
C$ 357Air Canada
Find Deal
sáb., 7 feb. - dom., 22 feb.
Air Canada Logo
5:40 p.m. - 9:31 a.m.YXU-SEA
18h 51m2 stops
Air Canada Logo
8:10 a.m. - 9:21 p.m.SEA-YXU
10h 11m1 stop
C$ 391Air Canada
Find Deal
sáb., 7 feb. - dom., 22 feb.
United Airlines Logo
5:15 a.m. - 6:26 p.m.YXU-SEA
16h 11m2 stops
United Airlines Logo
11:59 p.m. - 9:21 p.m.SEA-YXU
18h 22m2 stops
C$ 438United Airlines
Find Deal
sáb., 7 feb. - dom., 22 feb.
Air Canada Logo
9:25 a.m. - 7:18 p.m.YXU-SEA
12h 53m2 stops
Air Canada Logo
5:50 a.m. - 9:18 p.m.SEA-YXU
12h 28m2 stops
C$ 765Air Canada
Find Deal
mar., 28 abr. - mié., 29 abr.
Air Canada Logo
9:25 a.m. - 7:18 p.m.YXU-SEA
12h 53m2 stops
Air Canada Logo
8:00 p.m. - 8:43 a.m.SEA-YXU
9h 43m2 stops
C$ 768Air Canada
Find Deal
mar., 28 abr. - mié., 29 abr.
Air Canada Logo
5:10 a.m. - 3:03 p.m.YXU-SEA
12h 53m2 stops
Air Canada Logo
8:00 a.m. - 9:18 p.m.SEA-YXU
10h 18m1 stop
C$ 815Air Canada
Find Deal
mar., 28 abr. - mié., 29 abr.
Air Canada Logo
9:25 a.m. - 9:51 p.m.YXU-SEA
15h 26m1 stop
Air Canada Logo
5:50 a.m. - 9:18 p.m.SEA-YXU
12h 28m2 stops
C$ 818Air Canada
Find Deal
mar., 28 abr. - mié., 29 abr.
United Airlines Logo
9:25 a.m. - 10:18 p.m.YXU-SEA
15h 53m3 stops
United Airlines Logo
5:15 a.m. - 9:18 p.m.SEA-YXU
13h 03m2 stops
C$ 852United Airlines
Find Deal
mar., 28 abr. - mié., 29 abr.
United Airlines Logo
9:25 a.m. - 10:18 p.m.YXU-SEA
15h 53m3 stops
United Airlines Logo
7:00 a.m. - 9:18 p.m.SEA-YXU
11h 18m2 stops
C$ 857United Airlines
Find Deal
mar., 28 abr. - mié., 29 abr.
Air Canada Logo
9:25 a.m. - 9:51 p.m.YXU-SEA
15h 26m1 stop
Air Canada Logo
8:00 a.m. - 9:18 p.m.SEA-YXU
10h 18m1 stop
C$ 864Air Canada
Find Deal
mar., 28 abr. - mié., 29 abr.

Air Canada flights from London, Ontario to Seattle

Our best Air Canada deals on London, Ontario to Seattle flight tickets
Air Canada
7 Feb
YXU5:40 p.m.London
7h 36m
1 stop
SEA10:16 p.m.Seattle/Tacoma Intl
22 Feb
SEA8:10 a.m.Seattle/Tacoma Intl
10h 11m
1 stop
YXU9:21 p.m.London
C$ 357
Find similar
Air Canada
7 Feb
YXU5:40 p.m.London
18h 51m
2 stops
SEA9:31 a.m.Seattle/Tacoma Intl
22 Feb
SEA8:10 a.m.Seattle/Tacoma Intl
10h 11m
1 stop
YXU9:21 p.m.London
C$ 391
Find similar
Air Canada
28 Apr
YXU9:25 a.m.London
12h 53m
2 stops
SEA7:18 p.m.Seattle/Tacoma Intl
29 Apr
SEA5:50 a.m.Seattle/Tacoma Intl
12h 28m
2 stops
YXU9:18 p.m.London
C$ 765
Find similar

United Airlines flights from London, Ontario to Seattle

Our best United Airlines deals on London, Ontario to Seattle flight tickets
United Airlines
7 Feb
YXU5:15 a.m.London
16h 11m
2 stops
SEA6:26 p.m.Seattle/Tacoma Intl
22 Feb
SEA11:59 p.m.Seattle/Tacoma Intl
18h 22m
2 stops
YXU9:21 p.m.London
C$ 438
Find similar
United Airlines
28 Apr
YXU9:25 a.m.London
15h 53m
3 stops
SEA10:18 p.m.Seattle/Tacoma Intl
29 Apr
SEA5:15 a.m.Seattle/Tacoma Intl
13h 03m
2 stops
YXU9:18 p.m.London
C$ 852
Find similar
United Airlines
28 Apr
YXU9:25 a.m.London
15h 53m
3 stops
SEA10:18 p.m.Seattle/Tacoma Intl
29 Apr
SEA7:00 a.m.Seattle/Tacoma Intl
11h 18m
2 stops
YXU9:18 p.m.London
C$ 857
Find similar

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 30 octubre 2025.
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

LondonSeattle

YXU - SEA

YXUSEA

London

sáb. 7/2

5:40 p.m.-10:16 p.m.

1 stop7h 36m

Seattle/Tacoma Intl

dom. 22/2

8:10 a.m.-9:21 p.m.

1 stop10h 11m

C$ 357

LondonSeattle

YXU - SEA

YXUSEA

London

sáb. 7/2

5:40 p.m.-9:31 a.m.

2 stops18h 51m

Seattle/Tacoma Intl

dom. 22/2

8:10 a.m.-9:21 p.m.

1 stop10h 11m

C$ 391

LondonSeattle

YXU - SEA

YXUSEA

London

sáb. 7/2

5:15 a.m.-6:26 p.m.

2 stops16h 11m

Seattle/Tacoma Intl

dom. 22/2

11:59 p.m.-9:21 p.m.

2 stops18h 22m

C$ 438

LondonSeattle

YXU - SEA

YXUSEA

London

mar. 28/4

9:25 a.m.-7:18 p.m.

2 stops12h 53m

Seattle/Tacoma Intl

mié. 29/4

5:50 a.m.-9:18 p.m.

2 stops12h 28m

C$ 765

LondonSeattle

YXU - SEA

YXUSEA

London

mar. 28/4

9:25 a.m.-7:18 p.m.

2 stops12h 53m

Seattle/Tacoma Intl

mié. 29/4

8:00 p.m.-8:43 a.m.

2 stops9h 43m

C$ 768

LondonSeattle

YXU - SEA

YXUSEA

London

mar. 28/4

5:10 a.m.-3:03 p.m.

2 stops12h 53m

Seattle/Tacoma Intl

mié. 29/4

8:00 a.m.-9:18 p.m.

1 stop10h 18m

C$ 815

LondonSeattle

YXU - SEA

YXUSEA

London

mar. 28/4

9:25 a.m.-9:51 p.m.

1 stop15h 26m

Seattle/Tacoma Intl

mié. 29/4

5:50 a.m.-9:18 p.m.

2 stops12h 28m

C$ 818

LondonSeattle

YXU - SEA

YXUSEA

London

mar. 28/4

9:25 a.m.-10:18 p.m.

3 stops15h 53m

Seattle/Tacoma Intl

mié. 29/4

5:15 a.m.-9:18 p.m.

2 stops13h 03m

C$ 852

LondonSeattle

YXU - SEA

YXUSEA

London

mar. 28/4

9:25 a.m.-10:18 p.m.

3 stops15h 53m

Seattle/Tacoma Intl

mié. 29/4

7:00 a.m.-9:18 p.m.

2 stops11h 18m

C$ 857

LondonSeattle

YXU - SEA

YXUSEA

London

mar. 28/4

9:25 a.m.-9:51 p.m.

1 stop15h 26m

Seattle/Tacoma Intl

mié. 29/4

8:00 a.m.-9:18 p.m.

1 stop10h 18m

C$ 864

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 day to depart on your flight to Seattle?

Our data shows that Friday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 374. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around C$ 712. These prices are subject to change though, so be sure to set up a Price Alert for flights to Seattle.

What is the cheapest time of day to depart on your flight to Seattle?

Our most recent data shows that the best time of day to fly to Seattle is in the afternoon. Flights from London, Ontario to Seattle during this time can be as low as C$ 563. Flights in the morning are often more expensive with an average ticket price of C$ 572.

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

Direct flights

None
There are no direct flights from London, Ontario to Seattle. There are no popular flight routes from London, Ontario to Seattle.
Search flight deals

  • 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 7h 36m.

  • 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$ 243Free CancellationRating
7.2
3,152 reviews
Search WestJet flights
United AirlinesPriceFrom C$ 281Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights
Air CanadaPriceFrom C$ 373Free CancellationRating
7.1
10,381 reviews
Search Air Canada flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Lynnwood
Marysville
Tacoma
SeaTac
Kirkland
Olympia
Ocean Shores
Redmond
Shoreline
Ellensburg
Gig Harbor
Renton
Mukilteo
Cle Elum
Centralia
Federal Way
Puyallup
Shelton
Lakewood

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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