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.

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.

$659 Cheap Flights from Seattle to London, Ontario in 2026/27

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.

4:58 pm - 2:05 pmSEA Seattle/Tacoma Intl-YXU London

18h 07m2 stops Denver Intl Orlando

6:15 am - 10:49 amYXU London-SEA Seattle/Tacoma Intl

31h 34m1 stop Fort Lauderdale

$659Multiple Airlines

Wed, Dec 16 - Wed, Dec 23

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

12h 05m1 stop Calgary

6:15 am - 9:56 pmYXU London-SEA Seattle/Tacoma Intl

18h 41m1 stop Fort Lauderdale

$726Multiple Airlines

Wed, Dec 16 - Wed, Dec 23

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

12h 05m1 stop Calgary

6:40 am - 1:53 pmYXU London-SEA Seattle/Tacoma Intl

58h 13m2 stops Calgary Los Angeles

$885WestJet

Fri, Dec 18 - Fri, Dec 25

12:31 pm - 5:35 amSEA Seattle/Tacoma Intl-YXU London

14h 04m2 stops Los Angeles Calgary

6:40 am - 1:53 pmYXU London-SEA Seattle/Tacoma Intl

58h 13m2 stops Calgary Los Angeles

$940WestJet

Fri, Dec 18 - Fri, Dec 25

8:40 am - 9:52 pmSEA Seattle/Tacoma Intl-YXU London

10h 12m2 stops Vancouver Intl Toronto Pearson Intl

3:20 pm - 8:59 pmYXU London-SEA Seattle/Tacoma Intl

8h 39m1 stop Toronto Pearson Intl

$977Air Canada

Tue, Jan 12 - Sat, Jan 16

8:40 am - 9:52 pmSEA Seattle/Tacoma Intl-YXU London

10h 12m2 stops Vancouver Intl Toronto Pearson Intl

5:30 am - 2:37 pmYXU London-SEA Seattle/Tacoma Intl

12h 07m2 stops Toronto Pearson Intl Vancouver Intl

$978Air Canada

Tue, Jan 12 - Sat, Jan 16

8:40 am - 9:52 pmSEA Seattle/Tacoma Intl-YXU London

10h 12m2 stops Vancouver Intl Toronto Pearson Intl

3:20 pm - 8:59 pmYXU London-SEA Seattle/Tacoma Intl

8h 39m1 stop Toronto Pearson Intl

$988Air Canada

Tue, Jan 12 - Sat, Jan 16

8:40 am - 9:52 pmSEA Seattle/Tacoma Intl-YXU London

10h 12m2 stops Vancouver Intl Toronto Pearson Intl

5:30 am - 2:37 pmYXU London-SEA Seattle/Tacoma Intl

12h 07m2 stops Toronto Pearson Intl Vancouver Intl

$989Air Canada

Tue, Jan 12 - Sat, Jan 16

7:45 am - 8:37 amSEA Seattle/Tacoma Intl-YXU London

21h 52m1 stop Toronto Pearson Intl

3:20 pm - 8:59 pmYXU London-SEA Seattle/Tacoma Intl

8h 39m1 stop Toronto Pearson Intl

$1,001Air Canada

Tue, Jan 12 - Sat, Jan 16

7:45 am - 8:37 amSEA Seattle/Tacoma Intl-YXU London

21h 52m1 stop Toronto Pearson Intl

3:20 pm - 8:59 pmYXU London-SEA Seattle/Tacoma Intl

8h 39m1 stop Toronto Pearson Intl

$1,011Air Canada

Tue, Jan 12 - Sat, Jan 16

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WestJet flights from Seattle to London, Ontario

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

WestJet

Dec 18

SEA2:30 pmSeattle/Tacoma Intl

12h 05m

1 stop

YXU5:35 amLondon

Dec 25

YXU6:40 amLondon

58h 13m

2 stops

SEA1:53 pmSeattle/Tacoma Intl

$885

WestJet

Dec 18

SEA12:31 pmSeattle/Tacoma Intl

14h 04m

2 stops

YXU5:35 amLondon

Dec 25

YXU6:40 amLondon

58h 13m

2 stops

SEA1:53 pmSeattle/Tacoma Intl

$940

WestJet

Dec 18

SEA2:30 pmSeattle/Tacoma Intl

12h 05m

1 stop

YXU5:35 amLondon

Dec 25

YXU6:40 amLondon

10h 00m

1 stop

SEA1:40 pmSeattle/Tacoma Intl

$1,276

Air Canada flights from Seattle to London, Ontario

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

Air Canada

Nov 14

SEA7:45 amSeattle/Tacoma Intl

9h 42m

1 stop

YXU8:27 pmLondon

Nov 16

YXU3:25 pmLondon

8h 34m

1 stop

SEA8:59 pmSeattle/Tacoma Intl

$951

Air Canada

Jan 12

SEA8:40 amSeattle/Tacoma Intl

10h 12m

2 stops

YXU9:52 pmLondon

Jan 16

YXU3:20 pmLondon

8h 39m

1 stop

SEA8:59 pmSeattle/Tacoma Intl

$977

Air Canada

Jan 12

SEA8:40 amSeattle/Tacoma Intl

10h 12m

2 stops

YXU9:52 pmLondon

Jan 16

YXU5:30 amLondon

12h 07m

2 stops

SEA2:37 pmSeattle/Tacoma Intl

$978

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Wed 12/16

4:58 pm-2:05 pm

2 stops18h 07m

London

Wed 12/23

6:15 am-10:49 am

1 stop31h 34m

$659

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Wed 12/16

2:30 pm-5:35 am

1 stop12h 05m

London

Wed 12/23

6:15 am-9:56 pm

1 stop18h 41m

$726

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Fri 12/18

2:30 pm-5:35 am

1 stop12h 05m

London

Fri 12/25

6:40 am-1:53 pm

2 stops58h 13m

$885

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Fri 12/18

12:31 pm-5:35 am

2 stops14h 04m

London

Fri 12/25

6:40 am-1:53 pm

2 stops58h 13m

$940

Quickest round-trip

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 1/12

8:40 am-9:52 pm

2 stops10h 12m

London

Sat 1/16

3:20 pm-8:59 pm

1 stop8h 39m

$977

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 1/12

8:40 am-9:52 pm

2 stops10h 12m

London

Sat 1/16

5:30 am-2:37 pm

2 stops12h 07m

$978

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 1/12

8:40 am-9:52 pm

2 stops10h 12m

London

Sat 1/16

3:20 pm-8:59 pm

1 stop8h 39m

$988

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 1/12

8:40 am-9:52 pm

2 stops10h 12m

London

Sat 1/16

5:30 am-2:37 pm

2 stops12h 07m

$989

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 1/12

7:45 am-8:37 am

1 stop21h 52m

London

Sat 1/16

3:20 pm-8:59 pm

1 stop8h 39m

$1,001

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 1/12

7:45 am-8:37 am

1 stop21h 52m

London

Sat 1/16

3:20 pm-8:59 pm

1 stop8h 39m

$1,011

Flights are sorted by cheapest round-trip flights first.

Sorted 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 56% 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	$659
Fastest flight time	12h 52m
Direct flights	None

The best flight deal from Seattle to London, Ontario found on momondo in the last 72 hours is $659

The fastest flight from Seattle to London, Ontario takes 12h 52m

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 12h 52m.
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 $659

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 12/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names and deals

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WestJet flights from Seattle to London, Ontario

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

Air Canada flights from Seattle to London, Ontario

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

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

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

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

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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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