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Cheap flights from London, Ontario to Seattle from C$ 385

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 12/9. 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
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$ 527WestJet
Thu, 24 Sep - Mon, 28 Sep
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$ 566WestJet
Mon, 14 Sep - Mon, 21 Sep
WestJet Logo
8:40 p.m. - 9:40 a.m.
YXU
-
SEA
16h 00m
1 stop
WestJet Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 567WestJet
Thu, 3 Sep - Thu, 10 Sep
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$ 579WestJet
Wed, 23 Sep - Mon, 28 Sep
Multiple Airlines Logo
6:10 a.m. - 10:00 p.m.
YXU
-
SEA
18h 50m
2 stops
Multiple Airlines Logo
7:35 p.m. - 5:20 a.m.
SEA
-
YXU
6h 45m
1 stop
C$ 618Multiple Airlines
Wed, 23 Sep - Mon, 28 Sep
WestJet Logo
2:40 p.m. - 9:40 a.m.
YXU
-
SEA
22h 00m
2 stops
WestJet Logo
7:00 a.m. - 4:45 p.m.
SEA
-
YXU
6h 45m
1 stop
C$ 639WestJet
Fri, 14 Aug - Sat, 22 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$ 661WestJet
Thu, 17 Sep - Sat, 19 Sep
Air Canada Logo
3:30 p.m. - 9:04 p.m.
YXU
-
SEA
8h 34m
1 stop
Air Canada Logo
8:00 a.m. - 5:43 p.m.
SEA
-
YXU
6h 43m
1 stop
C$ 701Air Canada
Thu, 10 Sep - Thu, 17 Sep
Air Canada Logo
10:05 a.m. - 6:32 p.m.
YXU
-
SEA
11h 27m
2 stops
Air Canada Logo
8:00 a.m. - 5:43 p.m.
SEA
-
YXU
6h 43m
1 stop
C$ 701Air Canada
Thu, 10 Sep - Thu, 17 Sep
Air Canada Logo
3:30 p.m. - 9:04 p.m.
YXU
-
SEA
8h 34m
1 stop
Air Canada Logo
8:00 a.m. - 5:43 p.m.
SEA
-
YXU
6h 43m
1 stop
C$ 715Air Canada
Thu, 17 Sep - Sat, 19 Sep

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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
10 Sep
YXU10:05 a.m.London
11h 27m
2 stops
SEA6:32 p.m.Seattle/Tacoma Intl
17 Sep
SEA8:00 a.m.Seattle/Tacoma Intl
6h 43m
1 stop
YXU5:43 p.m.London
C$ 701
Air Canada
17 Sep
YXU3:30 p.m.London
10h 17m
2 stops
SEA10:47 p.m.Seattle/Tacoma Intl
19 Sep
SEA8:00 a.m.Seattle/Tacoma Intl
6h 43m
1 stop
YXU5:43 p.m.London
C$ 715
Air Canada
23 Sep
YXU10:05 a.m.London
11h 27m
2 stops
SEA6:32 p.m.Seattle/Tacoma Intl
28 Sep
SEA7:15 p.m.Seattle/Tacoma Intl
11h 05m
2 stops
YXU9:20 a.m.London
C$ 722

WestJet flights from London, Ontario to Seattle

Our best WestJet deals on London, Ontario to Seattle flight tickets
WestJet
24 Sep
YXU6:10 a.m.London
15h 35m
1 stop
SEA6:45 p.m.Seattle/Tacoma Intl
28 Sep
SEA7:35 p.m.Seattle/Tacoma Intl
6h 45m
1 stop
YXU5:20 a.m.London
C$ 527
WestJet
14 Sep
YXU5:55 p.m.London
18h 45m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
21 Sep
SEA7:35 p.m.Seattle/Tacoma Intl
6h 45m
1 stop
YXU5:20 a.m.London
C$ 566
WestJet
3 Sep
YXU8:40 p.m.London
16h 00m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
10 Sep
SEA7:35 p.m.Seattle/Tacoma Intl
6h 45m
1 stop
YXU5:20 a.m.London
C$ 567

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 2 August 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 24/9

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

1 stop15h 35m

Seattle/Tacoma Intl

Mon 28/9

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

1 stop6h 45m

C$ 527

LondonSeattle

YXU - SEA

YXUSEA

London

Mon 14/9

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

1 stop18h 45m

Seattle/Tacoma Intl

Mon 21/9

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

1 stop6h 45m

C$ 566

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 3/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Thu 10/9

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

1 stop6h 45m

C$ 567

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 23/9

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

1 stop15h 35m

Seattle/Tacoma Intl

Mon 28/9

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

1 stop6h 45m

C$ 579

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 23/9

6:10 a.m.-10:00 p.m.

2 stops18h 50m

Seattle/Tacoma Intl

Mon 28/9

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

1 stop6h 45m

C$ 618

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 14/8

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

2 stops22h 00m

Seattle/Tacoma Intl

Sat 22/8

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

1 stop6h 45m

C$ 639

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 17/9

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

1 stop18h 45m

Seattle/Tacoma Intl

Sat 19/9

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

1 stop6h 45m

C$ 661
Quickest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 10/9

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

1 stop8h 34m

Seattle/Tacoma Intl

Thu 17/9

8:00 a.m.-5:43 p.m.

1 stop6h 43m

C$ 701

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 10/9

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

2 stops11h 27m

Seattle/Tacoma Intl

Thu 17/9

8:00 a.m.-5:43 p.m.

1 stop6h 43m

C$ 701

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 17/9

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

1 stop8h 34m

Seattle/Tacoma Intl

Sat 19/9

8:00 a.m.-5:43 p.m.

1 stop6h 43m

C$ 715

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 airline that flies from London to Seattle/Tacoma Intl?

Air Canada is the most popular carrier 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 37m

Direct flights

None
The fastest flight from London, Ontario to Seattle takes 8h 37m
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 37m.

  • 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 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.

Travelling to a place near Seattle?

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

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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