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.

$157 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

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:15 am - 12:43 pm

YXU

SEA

9h 28m

2 stops

7:35 pm - 5:25 am

SEA

YXU

6h 50m

1 stop

$417Multiple Airlines

Sat, May 2 - Sat, May 9

8:10 pm - 2:19 pm

YXU

SEA

21h 09m

1 stop

3:10 pm - 6:35 am

SEA

YXU

12h 25m

1 stop

$424WestJet

Sun, Mar 8 - Wed, Mar 11

6:15 am - 7:35 am

YXU

SEA

28h 20m

2 stops

7:35 pm - 5:25 am

SEA

YXU

6h 50m

1 stop

$433WestJet

Sat, May 2 - Sat, May 9

6:15 am - 6:45 pm

YXU

SEA

15h 30m

1 stop

7:35 pm - 5:25 am

SEA

YXU

6h 50m

1 stop

$450WestJet

Sat, May 2 - Sat, May 9

8:10 pm - 10:25 am

YXU

SEA

17h 15m

2 stops

3:10 pm - 6:35 am

SEA

YXU

12h 25m

1 stop

$458WestJet

Sun, Mar 8 - Wed, Mar 11

6:15 am - 7:52 pm

YXU

SEA

16h 37m

1 stop

7:35 pm - 5:25 am

SEA

YXU

6h 50m

1 stop

$466Multiple Airlines

Sat, May 2 - Sat, May 9

8:10 pm - 10:25 am

YXU

SEA

17h 15m

2 stops

3:10 pm - 6:35 am

SEA

YXU

12h 25m

1 stop

$479WestJet

Sun, Mar 8 - Wed, Mar 11

5:10 am - 2:01 pm

YXU

SEA

12h 51m

2 stops

8:00 pm - 8:46 am

SEA

YXU

9h 46m

2 stops

$544Air Canada

Sun, Mar 8 - Wed, Mar 11

5:10 am - 2:01 pm

YXU

SEA

12h 51m

2 stops

8:00 pm - 8:46 am

SEA

YXU

9h 46m

2 stops

$545Air Canada

Sun, Mar 8 - Wed, Mar 11

5:10 am - 2:01 pm

YXU

SEA

12h 51m

2 stops

8:00 pm - 8:46 am

SEA

YXU

9h 46m

2 stops

$548Air Canada

Sun, Mar 8 - Wed, Mar 11

United Airlines flights from London, Ontario to Seattle

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

United Airlines

Jun 17

YXU6:00 amLondon

7h 20m

1 stop

SEA10:20 amSeattle/Tacoma Intl

Jun 25

SEA11:30 amSeattle/Tacoma Intl

7h 07m

1 stop

YXU9:37 pmLondon

$663

United Airlines

Jun 17

YXU6:00 amLondon

15h 09m

2 stops

SEA6:09 pmSeattle/Tacoma Intl

Jun 25

SEA11:30 amSeattle/Tacoma Intl

7h 07m

1 stop

YXU9:37 pmLondon

$699

United Airlines

Jun 17

YXU12:20 pmLondon

13h 09m

2 stops

SEA10:29 pmSeattle/Tacoma Intl

Jun 25

SEA5:00 pmSeattle/Tacoma Intl

21h 32m

3 stops

YXU5:32 pmLondon

$1,266

Air Canada flights from London, Ontario to Seattle

Our best Air Canada deals on London, Ontario to Seattle flight tickets

Air Canada

Mar 8

YXU5:10 amLondon

12h 51m

2 stops

SEA2:01 pmSeattle/Tacoma Intl

Mar 11

SEA8:00 pmSeattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 amLondon

$544

Air Canada

Mar 8

YXU5:10 amLondon

12h 51m

2 stops

SEA2:01 pmSeattle/Tacoma Intl

Mar 11

SEA8:00 pmSeattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 amLondon

$545

Air Canada

Mar 8

YXU5:10 amLondon

12h 51m

2 stops

SEA2:01 pmSeattle/Tacoma Intl

Mar 11

SEA8:00 pmSeattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 amLondon

$548

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 5/2

6:15 am-12:43 pm

2 stops9h 28m

Seattle/Tacoma Intl

Sat 5/9

7:35 pm-5:25 am

1 stop6h 50m

$417

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 3/8

8:10 pm-2:19 pm

1 stop21h 09m

Seattle/Tacoma Intl

Wed 3/11

3:10 pm-6:35 am

1 stop12h 25m

$424

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 5/2

6:15 am-7:35 am

2 stops28h 20m

Seattle/Tacoma Intl

Sat 5/9

7:35 pm-5:25 am

1 stop6h 50m

$433

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 5/2

6:15 am-6:45 pm

1 stop15h 30m

Seattle/Tacoma Intl

Sat 5/9

7:35 pm-5:25 am

1 stop6h 50m

$450

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 3/8

8:10 pm-10:25 am

2 stops17h 15m

Seattle/Tacoma Intl

Wed 3/11

3:10 pm-6:35 am

1 stop12h 25m

$458

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 5/2

6:15 am-7:52 pm

1 stop16h 37m

Seattle/Tacoma Intl

Sat 5/9

7:35 pm-5:25 am

1 stop6h 50m

$466

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 3/8

8:10 pm-10:25 am

2 stops17h 15m

Seattle/Tacoma Intl

Wed 3/11

3:10 pm-6:35 am

1 stop12h 25m

$479

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 3/8

5:10 am-2:01 pm

2 stops12h 51m

Seattle/Tacoma Intl

Wed 3/11

8:00 pm-8:46 am

2 stops9h 46m

$544

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 3/8

5:10 am-2:01 pm

2 stops12h 51m

Seattle/Tacoma Intl

Wed 3/11

8:00 pm-8:46 am

2 stops9h 46m

$545

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 3/8

5:10 am-2:01 pm

2 stops12h 51m

Seattle/Tacoma Intl

Wed 3/11

8:00 pm-8:46 am

2 stops9h 46m

$548

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 is the most popular carrier 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 40% 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	9h 28m
Direct flights	None

The fastest flight from London, Ontario to Seattle takes 9h 28m

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 9h 28m, 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

Marysville

Puyallup

Redmond

Cle Elum

Tukwila

Lakewood

Federal Way

Centralia

Westport

Kirkland

Fife

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.