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.

$243 Cheap Flights from London, Ontario to Seattle in 2026

Find the cheapest flights from London, Ontario to Seattle

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:25 pm - 8:54 pm

YXU

SEA

8h 29m

1 stop

10:10 am - 9:06 am

SEA

YXU

19h 56m

2 stops

$431Air Canada

Wed, Nov 4 - Mon, Dec 7

5:55 pm - 9:40 am

YXU

SEA

18h 45m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$453WestJet

Fri, Oct 16 - Tue, Oct 20

5:55 pm - 9:40 am

YXU

SEA

18h 45m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$454WestJet

Fri, Oct 16 - Tue, Oct 20

8:00 pm - 1:20 pm

YXU

SEA

20h 20m

1 stop

3:10 pm - 6:15 pm

SEA

YXU

24h 05m

1 stop

$477WestJet

Wed, Nov 4 - Sun, Dec 6

3:30 pm - 10:42 pm

YXU

SEA

10h 12m

2 stops

5:40 am - 9:40 pm

SEA

YXU

13h 00m

2 stops

$484Air Canada

Fri, Oct 16 - Tue, Oct 20

3:25 pm - 8:54 pm

YXU

SEA

8h 29m

1 stop

10:40 pm - 9:46 pm

SEA

YXU

20h 06m

2 stops

$485United Airlines

Sun, Nov 1 - Sat, Dec 5

8:00 pm - 1:20 pm

YXU

SEA

20h 20m

1 stop

3:10 pm - 6:15 pm

SEA

YXU

24h 05m

1 stop

$489WestJet

Mon, Nov 2 - Tue, Dec 8

5:45 am - 2:18 pm

YXU

SEA

11h 33m

2 stops

7:00 am - 9:46 pm

SEA

YXU

11h 46m

2 stops

$491United Airlines

Wed, Nov 4 - Thu, Dec 10

8:00 pm - 1:20 pm

YXU

SEA

20h 20m

1 stop

3:10 pm - 6:15 pm

SEA

YXU

24h 05m

1 stop

$499WestJet

Thu, Nov 5 - Tue, Dec 8

3:25 pm - 8:54 pm

YXU

SEA

8h 29m

1 stop

7:45 am - 9:46 pm

SEA

YXU

11h 01m

1 stop

$521United Airlines

Sun, Nov 1 - Thu, Dec 10

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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

Nov 4

YXU3:25 pmLondon

8h 29m

1 stop

SEA8:54 pmSeattle/Tacoma Intl

Dec 7

SEA10:10 amSeattle/Tacoma Intl

19h 56m

2 stops

YXU9:06 amLondon

$431

Air Canada

Oct 16

YXU3:30 pmLondon

10h 12m

2 stops

SEA10:42 pmSeattle/Tacoma Intl

Oct 20

SEA5:40 amSeattle/Tacoma Intl

13h 00m

2 stops

YXU9:40 pmLondon

$484

United Airlines flights from London, Ontario to Seattle

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

United Airlines

Nov 1

YXU3:25 pmLondon

8h 29m

1 stop

SEA8:54 pmSeattle/Tacoma Intl

Dec 5

SEA10:40 pmSeattle/Tacoma Intl

20h 06m

2 stops

YXU9:46 pmLondon

$485

United Airlines

Nov 4

YXU5:45 amLondon

11h 33m

2 stops

SEA2:18 pmSeattle/Tacoma Intl

Dec 4

SEA7:32 pmSeattle/Tacoma Intl

10h 34m

2 stops

YXU9:06 amLondon

$491

United Airlines

Nov 1

YXU3:25 pmLondon

8h 29m

1 stop

SEA8:54 pmSeattle/Tacoma Intl

Dec 10

SEA7:45 amSeattle/Tacoma Intl

11h 01m

1 stop

YXU9:46 pmLondon

$521

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 11/4

3:25 pm-8:54 pm

1 stop8h 29m

Seattle/Tacoma Intl

Mon 12/7

10:10 am-9:06 am

2 stops19h 56m

$431

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 10/16

5:55 pm-9:40 am

1 stop18h 45m

Seattle/Tacoma Intl

Tue 10/20

7:35 pm-5:20 am

1 stop6h 45m

$453

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 10/16

5:55 pm-9:40 am

1 stop18h 45m

Seattle/Tacoma Intl

Tue 10/20

7:35 pm-5:20 am

1 stop6h 45m

$454

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 11/4

8:00 pm-1:20 pm

1 stop20h 20m

Seattle/Tacoma Intl

Sun 12/6

3:10 pm-6:15 pm

1 stop24h 05m

$477

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 10/16

3:30 pm-10:42 pm

2 stops10h 12m

Seattle/Tacoma Intl

Tue 10/20

5:40 am-9:40 pm

2 stops13h 00m

$484

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 11/1

3:25 pm-8:54 pm

1 stop8h 29m

Seattle/Tacoma Intl

Sat 12/5

10:40 pm-9:46 pm

2 stops20h 06m

$485

LondonSeattle

YXU - SEA

YXUSEA

London

Mon 11/2

8:00 pm-1:20 pm

1 stop20h 20m

Seattle/Tacoma Intl

Tue 12/8

3:10 pm-6:15 pm

1 stop24h 05m

$489

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 11/4

5:45 am-2:18 pm

2 stops11h 33m

Seattle/Tacoma Intl

Thu 12/10

7:00 am-9:46 pm

2 stops11h 46m

$491

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 11/5

8:00 pm-1:20 pm

1 stop20h 20m

Seattle/Tacoma Intl

Tue 12/8

3:10 pm-6:15 pm

1 stop24h 05m

$499

Quickest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 11/1

3:25 pm-8:54 pm

1 stop8h 29m

Seattle/Tacoma Intl

Thu 12/10

7:45 am-9:46 pm

1 stop11h 01m

$521

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first

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

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 35% of people opting to fly with this airline when traveling 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	27h 50m
Direct flights	None

The fastest flight from London, Ontario to Seattle takes 27h 50m

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?
Seattle/Tacoma Intl is 1997.9 mi away from London. Flights usually cover this in 27h 50m, 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.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Redmond

Kent

Lakewood

Puyallup

Tukwila

Marysville

Cle Elum

Federal Way

Fife

Centralia

Shoreline

Westport

Kirkland

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.