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.

$191 Cheap Flights from London, Ontario to Seattle in 2026/27

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.

7:40 am - 2:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

5:54 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

8h 41m1 stop Calgary

$361Multiple Airlines

Wed, Oct 28 - Thu, Dec 3

6:10 am - 6:45 pmYXU London-SEA Seattle/Tacoma Intl

15h 35m1 stop Calgary

7:35 pm - 5:20 amSEA Seattle/Tacoma Intl-YXU London

6h 45m1 stop Calgary

$364WestJet

Wed, Oct 21 - Thu, Oct 22

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$413WestJet

Thu, Dec 3 - Thu, Jan 14

6:40 am - 1:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$433WestJet

Wed, Jan 13 - Wed, Feb 24

6:10 am - 6:45 pmYXU London-SEA Seattle/Tacoma Intl

15h 35m1 stop Calgary

7:35 pm - 5:20 amSEA Seattle/Tacoma Intl-YXU London

6h 45m1 stop Calgary

$435WestJet

Wed, Oct 21 - Thu, Oct 22

6:10 am - 6:45 pmYXU London-SEA Seattle/Tacoma Intl

15h 35m1 stop Calgary

7:35 pm - 5:20 amSEA Seattle/Tacoma Intl-YXU London

6h 45m1 stop Calgary

$436WestJet

Wed, Oct 21 - Thu, Oct 22

6:10 am - 6:45 pmYXU London-SEA Seattle/Tacoma Intl

15h 35m1 stop Calgary

7:35 pm - 5:20 amSEA Seattle/Tacoma Intl-YXU London

6h 45m1 stop Calgary

$464WestJet

Wed, Oct 21 - Thu, Oct 22

6:10 am - 9:40 amYXU London-SEA Seattle/Tacoma Intl

30h 30m1 stop Calgary

2:30 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

$475WestJet

Wed, Oct 21 - Thu, Dec 3

6:10 am - 6:45 pmYXU London-SEA Seattle/Tacoma Intl

15h 35m1 stop Calgary

5:54 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

8h 41m1 stop Calgary

$485Multiple Airlines

Wed, Oct 21 - Thu, Dec 3

7:40 am - 2:40 pmYXU London-SEA Seattle/Tacoma Intl

10h 00m1 stop Calgary

9:34 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

29h 01m2 stops Vancouver Intl Calgary

$487Multiple Airlines

Wed, Oct 28 - Thu, Dec 3

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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

Jan 13

YXU3:20 pmLondon

8h 39m

1 stop

SEA8:59 pmSeattle/Tacoma Intl

Feb 24

SEA7:05 pmSeattle/Tacoma Intl

10h 32m

2 stops

YXU8:37 amLondon

$537

Air Canada

Dec 3

YXU5:30 amLondon

12h 07m

2 stops

SEA2:37 pmSeattle/Tacoma Intl

Jan 14

SEA7:05 pmSeattle/Tacoma Intl

10h 32m

2 stops

YXU8:37 amLondon

$549

Air Canada

Oct 21

YXU3:30 pmLondon

10h 17m

2 stops

SEA10:47 pmSeattle/Tacoma Intl

Dec 3

SEA8:40 amSeattle/Tacoma Intl

10h 12m

2 stops

YXU9:52 pmLondon

$561

WestJet flights from London, Ontario to Seattle

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

WestJet

Oct 21

YXU6:10 amLondon

15h 35m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

Oct 22

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

$364

WestJet

Jan 27

YXU6:40 amLondon

10h 00m

1 stop

SEA1:40 pmSeattle/Tacoma Intl

Feb 7

SEA2:30 pmSeattle/Tacoma Intl

12h 05m

1 stop

YXU5:35 amLondon

$382

WestJet

Dec 3

YXU6:40 amLondon

10h 00m

1 stop

SEA1:40 pmSeattle/Tacoma Intl

Jan 14

SEA2:30 pmSeattle/Tacoma Intl

12h 05m

1 stop

YXU5:35 amLondon

$413

momondo Fare Finder

Use the filters below to find and compare flights from London, Ontario to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 10/28

7:40 am-2:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Thu 12/3

5:54 pm-5:35 am

1 stop8h 41m

$361

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 10/21

6:10 am-6:45 pm

1 stop15h 35m

Seattle/Tacoma Intl

Thu 10/22

7:35 pm-5:20 am

1 stop6h 45m

$364

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Thu 12/3

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Thu 1/14

2:30 pm-5:35 am

1 stop12h 05m

$413

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 1/13

6:40 am-1:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Wed 2/24

2:30 pm-5:35 am

1 stop12h 05m

$433

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 10/21

6:10 am-6:45 pm

1 stop15h 35m

Seattle/Tacoma Intl

Thu 10/22

7:35 pm-5:20 am

1 stop6h 45m

$435

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 10/21

6:10 am-6:45 pm

1 stop15h 35m

Seattle/Tacoma Intl

Thu 10/22

7:35 pm-5:20 am

1 stop6h 45m

$436

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 10/21

6:10 am-6:45 pm

1 stop15h 35m

Seattle/Tacoma Intl

Thu 10/22

7:35 pm-5:20 am

1 stop6h 45m

$464

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 10/21

6:10 am-9:40 am

1 stop30h 30m

Seattle/Tacoma Intl

Thu 12/3

2:30 pm-5:35 am

1 stop12h 05m

$475

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 10/21

6:10 am-6:45 pm

1 stop15h 35m

Seattle/Tacoma Intl

Thu 12/3

5:54 pm-5:35 am

1 stop8h 41m

$485

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 10/28

7:40 am-2:40 pm

1 stop10h 00m

Seattle/Tacoma Intl

Thu 12/3

9:34 pm-5:35 am

2 stops29h 01m

$487

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 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 and Air Canada 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 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

Best Price Found	$191
Fastest flight time	10h 00m
Direct flights	None

The best one-way flight to Seattle from London, Ontario in the past 72 hours is $191. The best round-trip flight deal from London, Ontario to Seattle found on momondo in the last 72 hours is $361.

The fastest flight from London, Ontario to Seattle takes 10h 00m

There are no direct flights from London, Ontario to Seattle. There are no popular flight routes from London, Ontario to Seattle.

Search flight deals

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 10h 00m, 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

Kent

Olympia

Redmond

Lakewood

Federal Way

Fife

Puyallup

Tukwila

Lynnwood

Cle Elum

Marysville

Lacey

Kirkland

Centralia

Shoreline

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.