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.

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

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.

$230 Cheap Flights from London to Seattle in 2025/26

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Find the cheapest flights from London, Ontario to Seattle

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9:25 am - 7:18 pmYXU-SEA

12h 53m2 stops

5:50 am - 9:18 pmSEA-YXU

12h 28m2 stops

$548Air Canada

Find Deal

Tue, Apr 28 - Wed, Apr 29

9:25 am - 7:18 pmYXU-SEA

12h 53m2 stops

8:00 pm - 8:43 amSEA-YXU

9h 43m2 stops

$550Air Canada

Find Deal

Tue, Apr 28 - Wed, Apr 29

9:25 am - 7:18 pmYXU-SEA

12h 53m2 stops

8:00 am - 9:18 pmSEA-YXU

10h 18m1 stop

$583Air Canada

Find Deal

Tue, Apr 28 - Wed, Apr 29

5:10 am - 3:03 pmYXU-SEA

12h 53m2 stops

8:00 am - 9:18 pmSEA-YXU

10h 18m1 stop

$584Air Canada

Find Deal

Tue, Apr 28 - Wed, Apr 29

9:25 am - 9:51 pmYXU-SEA

15h 26m1 stop

5:50 am - 9:18 pmSEA-YXU

12h 28m2 stops

$586Air Canada

Find Deal

Tue, Apr 28 - Wed, Apr 29

9:25 am - 10:18 pmYXU-SEA

15h 53m3 stops

5:15 am - 9:18 pmSEA-YXU

13h 03m2 stops

$610United Airlines

Find Deal

Tue, Apr 28 - Wed, Apr 29

9:25 am - 10:18 pmYXU-SEA

15h 53m3 stops

5:00 pm - 8:43 amSEA-YXU

12h 43m2 stops

$613United Airlines

Find Deal

Tue, Apr 28 - Wed, Apr 29

9:25 am - 10:18 pmYXU-SEA

15h 53m3 stops

7:00 am - 9:18 pmSEA-YXU

11h 18m2 stops

$614United Airlines

Find Deal

Tue, Apr 28 - Wed, Apr 29

9:25 am - 9:51 pmYXU-SEA

15h 26m1 stop

8:00 am - 9:18 pmSEA-YXU

10h 18m1 stop

$619Air Canada

Find Deal

Tue, Apr 28 - Wed, Apr 29

9:25 am - 9:51 pmYXU-SEA

15h 26m1 stop

8:00 am - 9:18 pmSEA-YXU

10h 18m1 stop

$621Air Canada

Find Deal

Tue, Apr 28 - Wed, Apr 29

Air Canada flights from London, Ontario to Seattle

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

Air Canada

Apr 28

YXU9:25 amLondon

12h 53m

2 stops

SEA7:18 pmSeattle/Tacoma Intl

Apr 29

SEA5:50 amSeattle/Tacoma Intl

12h 28m

2 stops

YXU9:18 pmLondon

$548

Find similar

Air Canada

Apr 28

YXU9:25 amLondon

12h 53m

2 stops

SEA7:18 pmSeattle/Tacoma Intl

Apr 29

SEA8:00 pmSeattle/Tacoma Intl

9h 43m

2 stops

YXU8:43 amLondon

$550

Find similar

Air Canada

Apr 28

YXU9:25 amLondon

12h 53m

2 stops

SEA7:18 pmSeattle/Tacoma Intl

Apr 29

SEA8:00 amSeattle/Tacoma Intl

10h 18m

1 stop

YXU9:18 pmLondon

$583

Find similar

United Airlines flights from London, Ontario to Seattle

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

United Airlines

Apr 28

YXU9:25 amLondon

15h 53m

3 stops

SEA10:18 pmSeattle/Tacoma Intl

Apr 29

SEA5:15 amSeattle/Tacoma Intl

13h 03m

2 stops

YXU9:18 pmLondon

$610

Find similar

United Airlines

Apr 28

YXU9:25 amLondon

15h 53m

3 stops

SEA10:18 pmSeattle/Tacoma Intl

Apr 29

SEA5:00 pmSeattle/Tacoma Intl

12h 43m

2 stops

YXU8:43 amLondon

$613

Find similar

United Airlines

Apr 28

YXU9:25 amLondon

15h 53m

3 stops

SEA10:18 pmSeattle/Tacoma Intl

Apr 29

SEA7:00 amSeattle/Tacoma Intl

11h 18m

2 stops

YXU9:18 pmLondon

$614

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

9:25 am-7:18 pm

2 stops12h 53m

Seattle/Tacoma Intl

Wed 4/29

5:50 am-9:18 pm

2 stops12h 28m

$548

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

9:25 am-7:18 pm

2 stops12h 53m

Seattle/Tacoma Intl

Wed 4/29

8:00 pm-8:43 am

2 stops9h 43m

$550

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

9:25 am-7:18 pm

2 stops12h 53m

Seattle/Tacoma Intl

Wed 4/29

8:00 am-9:18 pm

1 stop10h 18m

$583

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

5:10 am-3:03 pm

2 stops12h 53m

Seattle/Tacoma Intl

Wed 4/29

8:00 am-9:18 pm

1 stop10h 18m

$584

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

9:25 am-9:51 pm

1 stop15h 26m

Seattle/Tacoma Intl

Wed 4/29

5:50 am-9:18 pm

2 stops12h 28m

$586

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

9:25 am-10:18 pm

3 stops15h 53m

Seattle/Tacoma Intl

Wed 4/29

5:15 am-9:18 pm

2 stops13h 03m

$610

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

9:25 am-10:18 pm

3 stops15h 53m

Seattle/Tacoma Intl

Wed 4/29

5:00 pm-8:43 am

2 stops12h 43m

$613

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

9:25 am-10:18 pm

3 stops15h 53m

Seattle/Tacoma Intl

Wed 4/29

7:00 am-9:18 pm

2 stops11h 18m

$614

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

9:25 am-9:51 pm

1 stop15h 26m

Seattle/Tacoma Intl

Wed 4/29

8:00 am-9:18 pm

1 stop10h 18m

$619

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 4/28

9:25 am-9:51 pm

1 stop15h 26m

Seattle/Tacoma Intl

Wed 4/29

8:00 am-9:18 pm

1 stop10h 18m

$621

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

Prices

Airlines

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from London, Ontario is on a Saturday. momondo users have found tickets for Saturday departures for as low as $316. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from London, Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $449.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from London, Ontario in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $330 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $477. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

Direct flights	None

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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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 7h 36m, 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

Puyallup

Marysville

Redmond

Tukwila

Federal Way

Lakewood

Cle Elum

Fife

Centralia

Kirkland

Shoreline

Westport

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.