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.

$245 Cheap Flights from London to Seattle in 2026

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Find the cheapest flights from London, Ontario to Seattle

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:55 pm - 6:45 pm

YXU

SEA

27h 50m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$337WestJet

Wed, May 6 - Mon, May 11

5:55 pm - 9:40 am

YXU

SEA

18h 45m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$408WestJet

Wed, Aug 12 - Sat, Aug 22

5:55 pm - 9:40 am

YXU

SEA

18h 45m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$437WestJet

Thu, Apr 30 - Mon, May 4

5:55 pm - 6:45 pm

YXU

SEA

27h 50m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$438WestJet

Thu, Apr 30 - Mon, May 4

5:55 pm - 9:40 am

YXU

SEA

18h 45m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$449WestJet

Thu, Apr 30 - Mon, May 4

5:55 pm - 9:40 am

YXU

SEA

18h 45m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$450WestJet

Thu, Apr 30 - Mon, May 4

9:30 am - 6:30 pm

YXU

SEA

12h 00m

2 stops

7:20 pm - 11:43 am

SEA

YXU

13h 23m

2 stops

$462Air Canada

Wed, May 6 - Mon, May 11

9:25 am - 9:53 pm

YXU

SEA

15h 28m

1 stop

7:20 pm - 8:53 am

SEA

YXU

10h 33m

2 stops

$467Air Canada

Thu, Apr 30 - Mon, May 4

9:25 am - 9:53 pm

YXU

SEA

15h 28m

1 stop

7:20 pm - 8:53 am

SEA

YXU

10h 33m

2 stops

$474Air Canada

Thu, Apr 30 - Mon, May 4

9:25 am - 9:53 pm

YXU

SEA

15h 28m

1 stop

7:20 pm - 8:53 am

SEA

YXU

10h 33m

2 stops

$475Air Canada

Thu, Apr 30 - Mon, May 4

United Airlines flights from London, Ontario to Seattle

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

United Airlines

Aug 12

YXU6:00 amLondon

16h 07m

3 stops

SEA7:07 pmSeattle/Tacoma Intl

Aug 22

SEA11:56 pmSeattle/Tacoma Intl

12h 04m

2 stops

YXU3:00 pmLondon

$509

United Airlines

Apr 30

YXU9:25 amLondon

12h 35m

2 stops

SEA7:00 pmSeattle/Tacoma Intl

May 4

SEA11:53 pmSeattle/Tacoma Intl

18h 45m

2 stops

YXU9:38 pmLondon

$513

United Airlines

Apr 30

YXU9:25 amLondon

16h 22m

2 stops

SEA10:47 pmSeattle/Tacoma Intl

May 4

SEA7:25 amSeattle/Tacoma Intl

11h 13m

2 stops

YXU9:38 pmLondon

$523

WestJet flights from London, Ontario to Seattle

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

WestJet

May 6

YXU5:55 pmLondon

27h 50m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

May 11

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

$337

WestJet

Aug 12

YXU5:55 pmLondon

18h 45m

1 stop

SEA9:40 amSeattle/Tacoma Intl

Aug 22

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

$408

WestJet

Apr 30

YXU5:55 pmLondon

18h 45m

1 stop

SEA9:40 amSeattle/Tacoma Intl

May 4

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

$437

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 5/6

5:55 pm-6:45 pm

1 stop27h 50m

Seattle/Tacoma Intl

Mon 5/11

7:35 pm-5:20 am

1 stop6h 45m

$337

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 8/12

5:55 pm-9:40 am

1 stop18h 45m

Seattle/Tacoma Intl

Sat 8/22

7:35 pm-5:20 am

1 stop6h 45m

$408

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 4/30

5:55 pm-9:40 am

1 stop18h 45m

Seattle/Tacoma Intl

Mon 5/4

7:35 pm-5:20 am

1 stop6h 45m

$437

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 4/30

5:55 pm-6:45 pm

1 stop27h 50m

Seattle/Tacoma Intl

Mon 5/4

7:35 pm-5:20 am

1 stop6h 45m

$438

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 4/30

5:55 pm-9:40 am

1 stop18h 45m

Seattle/Tacoma Intl

Mon 5/4

7:35 pm-5:20 am

1 stop6h 45m

$449

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 4/30

5:55 pm-9:40 am

1 stop18h 45m

Seattle/Tacoma Intl

Mon 5/4

7:35 pm-5:20 am

1 stop6h 45m

$450

Quickest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 5/6

9:30 am-6:30 pm

2 stops12h 00m

Seattle/Tacoma Intl

Mon 5/11

7:20 pm-11:43 am

2 stops13h 23m

$462

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 4/30

9:25 am-9:53 pm

1 stop15h 28m

Seattle/Tacoma Intl

Mon 5/4

7:20 pm-8:53 am

2 stops10h 33m

$467

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 4/30

9:25 am-9:53 pm

1 stop15h 28m

Seattle/Tacoma Intl

Mon 5/4

7:20 pm-8:53 am

2 stops10h 33m

$474

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 4/30

9:25 am-9:53 pm

1 stop15h 28m

Seattle/Tacoma Intl

Mon 5/4

7:20 pm-8:53 am

2 stops10h 33m

$475

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 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?

WestJet, 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 39% 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	16h 05m
Direct flights	None

The fastest flight from London, Ontario to Seattle takes 16h 05m

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?
Seattle/Tacoma Intl is 1997.9 mi away from London. Flights usually cover this in 16h 05m, 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

Kent

Redmond

Marysville

Puyallup

Cle Elum

Lakewood

Tukwila

Federal Way

Fife

Westport

Centralia

Kirkland

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.