$262 Cheap Flights from London, Ontario to Seattle in 2026/27 | momondo

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Find the cheapest flights from London, Ontario to Seattle

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One-way

Cheap round-trip flights

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6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$381WestJet

Fri, Feb 5 - Mon, Feb 8

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$488WestJet

Thu, Nov 19 - Sun, Nov 22

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$507WestJet

Fri, Nov 27 - Fri, Dec 4

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$555WestJet

Wed, Dec 2 - Thu, Dec 3

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$556WestJet

Wed, Dec 2 - Thu, Dec 3

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$561WestJet

Wed, Dec 2 - Thu, Dec 3

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$570WestJet

Wed, Dec 2 - Thu, Dec 3

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

3:45 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

10h 50m2 stops Vancouver Intl Calgary

$615Multiple Airlines

Fri, Feb 5 - Mon, Feb 8

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

11:00 am - 5:35 amSEA Seattle/Tacoma Intl-YXU London

15h 35m2 stops San Francisco Calgary

$626Delta

Fri, Nov 27 - Fri, Dec 4

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

7:51 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

30h 44m2 stops Las Vegas Harry Reid Intl Calgary

$684Multiple Airlines

Thu, Nov 19 - Sun, Nov 22

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WestJet flights from London, Ontario to Seattle

Our best WestJet deals on London, Ontario to Seattle flight tickets

WestJet

Feb 5

YXU6:40 amLondon

10h 00m

1 stop

SEA1:40 pmSeattle/Tacoma Intl

Feb 8

SEA2:30 pmSeattle/Tacoma Intl

12h 05m

1 stop

YXU5:35 amLondon

$381

WestJet

Nov 19

YXU6:40 amLondon

10h 00m

1 stop

SEA1:40 pmSeattle/Tacoma Intl

Nov 22

SEA2:30 pmSeattle/Tacoma Intl

12h 05m

1 stop

YXU5:35 amLondon

$488

WestJet

Nov 27

YXU6:40 amLondon

10h 00m

1 stop

SEA1:40 pmSeattle/Tacoma Intl

Dec 4

SEA2:30 pmSeattle/Tacoma Intl

12h 05m

1 stop

YXU5:35 amLondon

$507

United Airlines flights from London, Ontario to Seattle

Our best United Airlines deals on London, Ontario to Seattle flight tickets

United Airlines

Feb 5

YXU9:15 amLondon

17h 00m

2 stops

SEA11:15 pmSeattle/Tacoma Intl

Feb 8

SEA5:28 pmSeattle/Tacoma Intl

25h 24m

2 stops

YXU9:52 pmLondon

$694

United Airlines

Feb 5

YXU3:20 pmLondon

32h 57m

3 stops

SEA9:17 pmSeattle/Tacoma Intl

Feb 8

SEA5:28 pmSeattle/Tacoma Intl

25h 24m

2 stops

YXU9:52 pmLondon

$704

United Airlines

Nov 27

YXU9:15 amLondon

17h 03m

2 stops

SEA11:18 pmSeattle/Tacoma Intl

Dec 4

SEA3:20 pmSeattle/Tacoma Intl

20h 22m

2 stops

YXU2:42 pmLondon

$719

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Fri 2/5

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Mon 2/8

2:30 pm-5:35 am

1 stop12h 05m

$381

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Thu 11/19

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Sun 11/22

2:30 pm-5:35 am

1 stop12h 05m

$488

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Fri 11/27

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Fri 12/4

2:30 pm-5:35 am

1 stop12h 05m

$507

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 12/2

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Thu 12/3

2:30 pm-5:35 am

1 stop12h 05m

$555

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 12/2

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Thu 12/3

2:30 pm-5:35 am

1 stop12h 05m

$556

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 12/2

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Thu 12/3

2:30 pm-5:35 am

1 stop12h 05m

$561

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 12/2

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Thu 12/3

2:30 pm-5:35 am

1 stop12h 05m

$570

Quickest round-trip

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Fri 2/5

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Mon 2/8

3:45 pm-5:35 am

2 stops10h 50m

$615

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Fri 11/27

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Fri 12/4

11:00 am-5:35 am

2 stops15h 35m

$626

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Thu 11/19

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Sun 11/22

7:51 pm-5:35 am

2 stops30h 44m

$684

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first

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

What 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 36% of people opting to fly with this airline when traveling 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

Best Price Found	$262
Fastest flight time	8h 39m
Direct flights	None

The best one-way flight to Seattle from London, Ontario in the past 72 hours is $262. The best round-trip flight deal from London, Ontario to Seattle found on momondo in the last 72 hours is $381.

The fastest flight from London, Ontario to Seattle takes 8h 39m

There are no direct flights from London, Ontario to Seattle. There are no popular flight routes from London, Ontario to Seattle.

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Frequently asked questions about flying from London, Ontario to Seattle

How far is London to Seattle/Tacoma Intl by plane?
Seattle/Tacoma Intl is 1997.9 mi away from London. Flights usually cover this in 8h 39m, depending on flying conditions and air traffic around both airports.
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 are updated daily.
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 that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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.

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SeaTac

Ocean Shores

Renton

Olympia

Redmond

Kent

Federal Way

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Fife

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Tukwila

Cle Elum

Marysville

Lacey

Kirkland

Centralia

Shoreline

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seattle from London.

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

momondo does allow users to show only those flights to Seattle from London which offer a flexible booking policy as well as other useful filters and features.

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

momondo provides multiple filters to help you find the best flight to Seattle from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from London and alert you when they change.

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