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.

$248 Cheap Flights from London, Ontario to Seattle in 2026

1 adult

0 bags

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.

6:10 am - 6:45 pm

YXU

SEA

15h 35m

1 stop

7:00 am - 4:45 pm

SEA

YXU

6h 45m

1 stop

$250WestJet

Wed, Jun 24 - Wed, Jul 15

5:55 pm - 6:45 pm

YXU

SEA

27h 50m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$260WestJet

Thu, May 28 - Tue, Jun 2

2:40 pm - 9:40 am

YXU

SEA

22h 00m

2 stops

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$446WestJet

Tue, Jun 9 - Wed, Jun 10

3:30 pm - 9:07 pm

YXU

SEA

8h 37m

1 stop

7:20 pm - 9:20 am

SEA

YXU

11h 00m

2 stops

$459Air Canada

Wed, Jun 24 - Wed, Jul 15

9:30 am - 9:08 pm

YXU

SEA

14h 38m

1 stop

7:20 pm - 5:33 pm

SEA

YXU

19h 13m

2 stops

$480Air Canada

Thu, May 28 - Tue, Jun 2

6:10 pm - 10:07 am

YXU

SEA

18h 57m

2 stops

7:20 pm - 9:20 am

SEA

YXU

11h 00m

2 stops

$483Air Canada

Wed, Jun 24 - Wed, Jul 15

3:30 pm - 9:08 pm

YXU

SEA

8h 38m

1 stop

3:00 pm - 9:18 am

SEA

YXU

15h 18m

2 stops

$491Air Canada

Tue, Jun 9 - Wed, Jun 10

6:10 pm - 10:05 am

YXU

SEA

18h 55m

2 stops

3:00 pm - 9:18 am

SEA

YXU

15h 18m

2 stops

$509Air Canada

Tue, Jun 9 - Wed, Jun 10

6:10 pm - 10:05 am

YXU

SEA

18h 55m

2 stops

3:00 pm - 9:18 am

SEA

YXU

15h 18m

2 stops

$511Air Canada

Tue, Jun 9 - Wed, Jun 10

3:30 pm - 9:08 pm

YXU

SEA

8h 38m

1 stop

8:00 am - 9:38 pm

SEA

YXU

10h 38m

1 stop

$516Air Canada

Tue, Jun 9 - Wed, Jun 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

Jun 24

YXU3:30 pmLondon

8h 37m

1 stop

SEA9:07 pmSeattle/Tacoma Intl

Jul 15

SEA7:20 pmSeattle/Tacoma Intl

11h 00m

2 stops

YXU9:20 amLondon

$459

Air Canada

May 28

YXU9:30 amLondon

14h 38m

1 stop

SEA9:08 pmSeattle/Tacoma Intl

Jun 2

SEA7:20 pmSeattle/Tacoma Intl

19h 13m

2 stops

YXU5:33 pmLondon

$480

Air Canada

Jun 24

YXU6:10 pmLondon

18h 57m

2 stops

SEA10:07 amSeattle/Tacoma Intl

Jul 15

SEA7:20 pmSeattle/Tacoma Intl

11h 00m

2 stops

YXU9:20 amLondon

$483

United Airlines flights from London, Ontario to Seattle

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

United Airlines

Jun 20

YXU3:30 pmLondon

8h 37m

1 stop

SEA9:07 pmSeattle/Tacoma Intl

Jun 25

SEA5:00 pmSeattle/Tacoma Intl

18h 57m

2 stops

YXU2:57 pmLondon

$530

United Airlines

Jun 9

YXU5:10 amLondon

21h 22m

3 stops

SEA11:32 pmSeattle/Tacoma Intl

Jun 10

SEA5:15 pmSeattle/Tacoma Intl

18h 43m

2 stops

YXU2:58 pmLondon

$597

United Airlines

Jun 9

YXU5:10 amLondon

21h 22m

3 stops

SEA11:32 pmSeattle/Tacoma Intl

Jun 10

SEA5:00 pmSeattle/Tacoma Intl

18h 58m

2 stops

YXU2:58 pmLondon

$640

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 6/24

6:10 am-6:45 pm

1 stop15h 35m

Seattle/Tacoma Intl

Wed 7/15

7:00 am-4:45 pm

1 stop6h 45m

$250

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 5/28

5:55 pm-6:45 pm

1 stop27h 50m

Seattle/Tacoma Intl

Tue 6/2

7:35 pm-5:20 am

1 stop6h 45m

$260

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 6/9

2:40 pm-9:40 am

2 stops22h 00m

Seattle/Tacoma Intl

Wed 6/10

7:35 pm-5:20 am

1 stop6h 45m

$446

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 6/24

3:30 pm-9:07 pm

1 stop8h 37m

Seattle/Tacoma Intl

Wed 7/15

7:20 pm-9:20 am

2 stops11h 00m

$459

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 5/28

9:30 am-9:08 pm

1 stop14h 38m

Seattle/Tacoma Intl

Tue 6/2

7:20 pm-5:33 pm

2 stops19h 13m

$480

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 6/24

6:10 pm-10:07 am

2 stops18h 57m

Seattle/Tacoma Intl

Wed 7/15

7:20 pm-9:20 am

2 stops11h 00m

$483

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 6/9

3:30 pm-9:08 pm

1 stop8h 38m

Seattle/Tacoma Intl

Wed 6/10

3:00 pm-9:18 am

2 stops15h 18m

$491

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 6/9

6:10 pm-10:05 am

2 stops18h 55m

Seattle/Tacoma Intl

Wed 6/10

3:00 pm-9:18 am

2 stops15h 18m

$509

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 6/9

6:10 pm-10:05 am

2 stops18h 55m

Seattle/Tacoma Intl

Wed 6/10

3:00 pm-9:18 am

2 stops15h 18m

$511

Quickest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 6/9

3:30 pm-9:08 pm

1 stop8h 38m

Seattle/Tacoma Intl

Wed 6/10

8:00 am-9:38 pm

1 stop10h 38m

$516

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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 38% 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	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.

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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 37m, 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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Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Redmond

Kent

Marysville

Puyallup

Tukwila

Lakewood

Cle Elum

Federal Way

Centralia

Fife

Shoreline

Westport

Tumwater

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.