What airlines fly to London, Ontario?

Alaska Airlines, WestJet and Air Canada are the top three most popular airlines that fly to London, Ontario from Seattle according to our data. Alaska Airlines is the first choice among our users, with 56% of people opting to fly with this airline when traveling to London, Ontario. Keep in mind that there are 5 different airlines that fly to London, Ontario on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Seattle/Tacoma Intl to London?

WestJet is the most popular carrier operating from Seattle/Tacoma Intl to London

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to London Airport?

Prices for flights from Seattle/Tacoma Intl Airport to London Airport are updated daily.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to London Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to London Airport.

What documentation or ID do you need to fly to London Airport?

The travel and health documents you'll need for your trip to London Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$211 Cheap Flights from Seattle to London, Ontario in 2026

Find the cheapest flights from Seattle to London

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

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

6h 45m1 stop Calgary

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

10h 00m1 stop Calgary

$397WestJet

Fri, Oct 23 - Fri, Oct 30

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

6h 45m1 stop Calgary

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

15h 35m1 stop Calgary

$417WestJet

Tue, Oct 20 - Sat, Oct 24

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

6h 45m1 stop Calgary

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

15h 35m1 stop Calgary

$438WestJet

Tue, Oct 20 - Sat, Oct 24

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

6h 45m1 stop Calgary

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

15h 35m1 stop Calgary

$518WestJet

Tue, Oct 20 - Sat, Oct 24

10:30 am - 5:20 amSEA Seattle/Tacoma Intl-YXU London

15h 50m1 stop Calgary

7:40 am - 6:31 pmYXU London-SEA Seattle/Tacoma Intl

13h 51m2 stops Calgary Vancouver Intl

$520Multiple Airlines

Fri, Oct 23 - Fri, Oct 30

10:30 am - 5:20 amSEA Seattle/Tacoma Intl-YXU London

15h 50m1 stop Calgary

5:55 pm - 6:45 pmYXU London-SEA Seattle/Tacoma Intl

27h 50m1 stop Calgary

$548WestJet

Sun, Oct 4 - Sun, Oct 11

5:50 am - 5:43 pmSEA Seattle/Tacoma Intl-YXU London

8h 53m2 stops Vancouver Intl Toronto Pearson Intl

3:25 pm - 9:27 amYXU London-SEA Seattle/Tacoma Intl

21h 02m2 stops Toronto Pearson Intl Vancouver Intl

$626Air Canada

Fri, Oct 23 - Fri, Oct 30

7:55 am - 7:40 pmSEA Seattle/Tacoma Intl-YXU London

8h 45m1 stop Toronto Pearson Intl

9:05 am - 6:32 pmYXU London-SEA Seattle/Tacoma Intl

12h 27m2 stops Toronto Pearson Intl Vancouver Intl

$683Air Canada

Tue, Oct 20 - Sat, Oct 24

7:15 pm - 8:25 amSEA Seattle/Tacoma Intl-YXU London

10h 10m2 stops Vancouver Intl Toronto Pearson Intl

9:05 am - 6:32 pmYXU London-SEA Seattle/Tacoma Intl

12h 27m2 stops Toronto Pearson Intl Vancouver Intl

$688Air Canada

Tue, Oct 20 - Sat, Oct 24

7:55 am - 7:40 pmSEA Seattle/Tacoma Intl-YXU London

8h 45m1 stop Toronto Pearson Intl

9:05 am - 6:32 pmYXU London-SEA Seattle/Tacoma Intl

12h 27m2 stops Toronto Pearson Intl Vancouver Intl

$726Air Canada

Tue, Oct 20 - Sat, Oct 24

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United Airlines flights from Seattle to London, Ontario

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

United Airlines

Oct 4

SEA6:43 pmSeattle/Tacoma Intl

10h 42m

2 stops

YXU8:25 amLondon

Oct 11

YXU3:30 pmLondon

8h 34m

1 stop

SEA9:04 pmSeattle/Tacoma Intl

$871

United Airlines

Oct 4

SEA5:05 pmSeattle/Tacoma Intl

21h 38m

3 stops

YXU5:43 pmLondon

Oct 11

YXU3:30 pmLondon

8h 34m

1 stop

SEA9:04 pmSeattle/Tacoma Intl

$877

United Airlines

Oct 4

SEA5:05 pmSeattle/Tacoma Intl

21h 38m

3 stops

YXU5:43 pmLondon

Oct 11

YXU8:20 pmLondon

18h 07m

2 stops

SEA11:27 amSeattle/Tacoma Intl

$939

WestJet flights from Seattle to London, Ontario

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

WestJet

Oct 23

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

Oct 30

YXU7:40 amLondon

10h 00m

1 stop

SEA2:40 pmSeattle/Tacoma Intl

$397

WestJet

Oct 20

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

Oct 24

YXU6:10 amLondon

15h 35m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$417

WestJet

Oct 20

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

Oct 24

YXU6:10 amLondon

15h 35m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$438

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Fri 10/23

7:35 pm-5:20 am

1 stop6h 45m

London

Fri 10/30

7:40 am-2:40 pm

1 stop10h 00m

$397

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 10/20

7:35 pm-5:20 am

1 stop6h 45m

London

Sat 10/24

6:10 am-6:45 pm

1 stop15h 35m

$417

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 10/20

7:35 pm-5:20 am

1 stop6h 45m

London

Sat 10/24

6:10 am-6:45 pm

1 stop15h 35m

$438

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 10/20

7:35 pm-5:20 am

1 stop6h 45m

London

Sat 10/24

6:10 am-6:45 pm

1 stop15h 35m

$518

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Fri 10/23

10:30 am-5:20 am

1 stop15h 50m

London

Fri 10/30

7:40 am-6:31 pm

2 stops13h 51m

$520

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Sun 10/4

10:30 am-5:20 am

1 stop15h 50m

London

Sun 10/11

5:55 pm-6:45 pm

1 stop27h 50m

$548

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Fri 10/23

5:50 am-5:43 pm

2 stops8h 53m

London

Fri 10/30

3:25 pm-9:27 am

2 stops21h 02m

$626

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 10/20

7:55 am-7:40 pm

1 stop8h 45m

London

Sat 10/24

9:05 am-6:32 pm

2 stops12h 27m

$683

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 10/20

7:15 pm-8:25 am

2 stops10h 10m

London

Sat 10/24

9:05 am-6:32 pm

2 stops12h 27m

$688

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 10/20

7:55 am-7:40 pm

1 stop8h 45m

London

Sat 10/24

9:05 am-6:32 pm

2 stops12h 27m

$726

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seattle to London, Ontario

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

Can stopping save me money on Seattle to London, Ontario flights?

You could potentially save up to 33% on your flight if you consider stops on a Seattle to London, Ontario flight.

When to book flights from Seattle to London, Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to London, Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Seattle to London, Ontario (SEA to YXU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to London, Ontario

Best Price Found	$211
Fastest flight time	15h 50m
Direct flights	None

The best one-way flight to London, Ontario from Seattle in the past 72 hours is $211. The best round-trip flight deal from Seattle to London, Ontario found on momondo in the last 72 hours is $397.

The fastest flight from Seattle to London, Ontario takes 15h 50m

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

Search flight deals

Frequently asked questions about flying from Seattle to London, Ontario

How far is Seattle/Tacoma Intl to London by plane?
The straight-line distance from Seattle/Tacoma Intl to London is 1997.9 mi. By plane, this route typically takes 15h 50m.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to London Airport?
Prices for flights from Seattle/Tacoma Intl Airport to London Airport are updated daily.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to London Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to London Airport.
What documentation or ID do you need to fly to London Airport?
The travel and health documents you'll need for your trip to London Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Grand Bend

Port Stanley

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to London?

Finding the right flight to London from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

Can I find flights from Seattle to London with flexible booking policies on momondo?

momondo does allow users to show only those flights to London from Seattle which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Seattle to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to London.

I’m not ready to book a flight from Seattle to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Seattle to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your London, Ontario trip

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Cheap flights from Seattle to London from $211

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 11/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Seattle to London

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Big names and deals

Big names and deals

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Filter for what you want

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United Airlines flights from Seattle to London, Ontario

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

WestJet flights from Seattle to London, Ontario

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

momondo Fare Finder

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

See travel insights to London from

How to get the cheapest flight ticket from Seattle to London, Ontario

Can stopping save me money on Seattle to London, Ontario flights?

What is the cheapest airline that flies from Seattle/Tacoma Intl to London?

What airlines fly to London, Ontario?

When to book flights from Seattle to London, Ontario

Cheap Seattle to London, Ontario (SEA to YXU) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Seattle to London, Ontario

Traveling to a place near London?

Why use momondo?

An easier way to manage your London, Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Canada

Airports servicing Ontario

Fly your favorite airline to London

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to London

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

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