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.

$275 Cheap Flights from London, Ontario to Seattle in 2026

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.

6:10 am - 6:45 pm

YXU

SEA

15h 35m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$376WestJet

Thu, Sep 24 - Mon, Sep 28

5:55 pm - 9:40 am

YXU

SEA

18h 45m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$404WestJet

Mon, Sep 14 - Mon, Sep 21

8:40 pm - 9:40 am

YXU

SEA

16h 00m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$405WestJet

Thu, Sep 3 - Thu, Sep 10

6:10 am - 6:45 pm

YXU

SEA

15h 35m

1 stop

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$413WestJet

Wed, Sep 23 - Mon, Sep 28

6:10 am - 10:00 pm

YXU

SEA

18h 50m

2 stops

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

$441Multiple Airlines

Wed, Sep 23 - Mon, Sep 28

2:40 pm - 9:40 am

YXU

SEA

22h 00m

2 stops

7:00 am - 4:45 pm

SEA

YXU

6h 45m

1 stop

$456WestJet

Fri, Aug 14 - 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

$472WestJet

Thu, Sep 17 - Sat, Sep 19

10:05 am - 6:32 pm

YXU

SEA

11h 27m

2 stops

8:00 am - 5:43 pm

SEA

YXU

6h 43m

1 stop

$500Air Canada

Thu, Sep 10 - Thu, Sep 17

3:30 pm - 10:47 pm

YXU

SEA

10h 17m

2 stops

8:00 am - 5:43 pm

SEA

YXU

6h 43m

1 stop

$510Air Canada

Thu, Sep 17 - Sat, Sep 19

6:10 am - 6:45 pm

YXU

SEA

15h 35m

1 stop

1:42 pm - 5:20 am

SEA

YXU

12h 38m

2 stops

$512Multiple Airlines

Thu, Sep 24 - Mon, Sep 28

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WestJet flights from London, Ontario to Seattle

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

WestJet

Sep 24

YXU6:10 amLondon

15h 35m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

Sep 28

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

$376

WestJet

Sep 14

YXU5:55 pmLondon

18h 45m

1 stop

SEA9:40 amSeattle/Tacoma Intl

Sep 21

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

$404

WestJet

Sep 23

YXU6:10 amLondon

15h 35m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

Sep 28

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

$413

Air Canada flights from London, Ontario to Seattle

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

Air Canada

Sep 17

YXU3:30 pmLondon

10h 17m

2 stops

SEA10:47 pmSeattle/Tacoma Intl

Sep 19

SEA8:00 amSeattle/Tacoma Intl

6h 43m

1 stop

YXU5:43 pmLondon

$510

Air Canada

Sep 23

YXU10:05 amLondon

11h 27m

2 stops

SEA6:32 pmSeattle/Tacoma Intl

Sep 28

SEA7:15 pmSeattle/Tacoma Intl

11h 05m

2 stops

YXU9:20 amLondon

$515

Air Canada

Sep 14

YXU3:30 pmLondon

10h 17m

2 stops

SEA10:47 pmSeattle/Tacoma Intl

Sep 21

SEA8:00 amSeattle/Tacoma Intl

6h 43m

1 stop

YXU5:43 pmLondon

$532

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 9/24

6:10 am-6:45 pm

1 stop15h 35m

Seattle/Tacoma Intl

Mon 9/28

7:35 pm-5:20 am

1 stop6h 45m

$376

LondonSeattle

YXU - SEA

YXUSEA

London

Mon 9/14

5:55 pm-9:40 am

1 stop18h 45m

Seattle/Tacoma Intl

Mon 9/21

7:35 pm-5:20 am

1 stop6h 45m

$404

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 9/3

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Thu 9/10

7:35 pm-5:20 am

1 stop6h 45m

$405

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 9/23

6:10 am-6:45 pm

1 stop15h 35m

Seattle/Tacoma Intl

Mon 9/28

7:35 pm-5:20 am

1 stop6h 45m

$413

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 9/23

6:10 am-10:00 pm

2 stops18h 50m

Seattle/Tacoma Intl

Mon 9/28

7:35 pm-5:20 am

1 stop6h 45m

$441

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 8/14

2:40 pm-9:40 am

2 stops22h 00m

Seattle/Tacoma Intl

Sat 8/22

7:00 am-4:45 pm

1 stop6h 45m

$456

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 9/17

5:55 pm-9:40 am

1 stop18h 45m

Seattle/Tacoma Intl

Sat 9/19

7:35 pm-5:20 am

1 stop6h 45m

$472

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 9/10

10:05 am-6:32 pm

2 stops11h 27m

Seattle/Tacoma Intl

Thu 9/17

8:00 am-5:43 pm

1 stop6h 43m

$500

Quickest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 9/17

3:30 pm-10:47 pm

2 stops10h 17m

Seattle/Tacoma Intl

Sat 9/19

8:00 am-5:43 pm

1 stop6h 43m

$510

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 9/24

6:10 am-6:45 pm

1 stop15h 35m

Seattle/Tacoma Intl

Mon 9/28

1:42 pm-5:20 am

2 stops12h 38m

$512

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 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 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 38% 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

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.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Kent

Lynnwood

Redmond

Lakewood

Puyallup

Tukwila

Federal Way

Fife

Cle Elum

Marysville

Kirkland

Centralia

Shoreline

Lacey

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.