Which airlines fly to London, Ontario?

Alaska Airlines, Air Canada and WestJet 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 travelling to London, Ontario. Keep in mind that there are 4 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?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, 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 required for your trip to London Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

C$ 382 Cheap Flights from Seattle to London in 2026

1 adult

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8:00 p.m. - 8:46 a.m.

SEA

YXU

9h 46m2 stops

5:40 p.m. - 10:16 p.m.

YXU

SEA

7h 36m1 stop

C$ 382Air Canada

Thu, 29 Jan - Sun, 1 Feb

8:00 p.m. - 8:46 a.m.

SEA

YXU

9h 46m2 stops

5:40 p.m. - 10:16 p.m.

YXU

SEA

7h 36m1 stop

C$ 383Air Canada

Thu, 29 Jan - Sun, 1 Feb

8:00 p.m. - 8:46 a.m.

SEA

YXU

9h 46m2 stops

5:10 a.m. - 2:31 p.m.

YXU

SEA

12h 21m2 stops

C$ 390Air Canada

Thu, 29 Jan - Sun, 1 Feb

8:10 a.m. - 9:21 p.m.

SEA

YXU

10h 11m1 stop

5:40 p.m. - 10:16 p.m.

YXU

SEA

7h 36m1 stop

C$ 409Air Canada

Thu, 29 Jan - Sun, 1 Feb

8:00 p.m. - 8:46 a.m.

SEA

YXU

9h 46m2 stops

5:10 a.m. - 7:16 p.m.

YXU

SEA

17h 06m2 stops

C$ 416Air Canada

Thu, 29 Jan - Sun, 1 Feb

8:10 a.m. - 9:21 p.m.

SEA

YXU

10h 11m1 stop

9:25 a.m. - 10:16 p.m.

YXU

SEA

15h 51m1 stop

C$ 442Air Canada

Tue, 10 Feb - Fri, 13 Feb

9:00 a.m. - 8:46 a.m.

SEA

YXU

20h 46m2 stops

5:40 p.m. - 10:16 p.m.

YXU

SEA

7h 36m1 stop

C$ 507United Airlines

Wed, 4 Feb - Wed, 11 Feb

8:10 a.m. - 9:20 p.m.

SEA

YXU

10h 10m1 stop

5:40 p.m. - 10:16 p.m.

YXU

SEA

7h 36m1 stop

C$ 528United Airlines

Wed, 4 Feb - Wed, 11 Feb

11:59 p.m. - 5:05 p.m.

SEA

YXU

14h 06m2 stops

9:25 a.m. - 8:56 p.m.

YXU

SEA

14h 31m2 stops

C$ 529United Airlines

Fri, 20 Feb - Fri, 27 Feb

12:57 p.m. - 5:05 p.m.

SEA

YXU

25h 08m3 stops

5:10 a.m. - 4:01 p.m.

YXU

SEA

13h 51m2 stops

C$ 536United Airlines

Thu, 29 Jan - Sun, 1 Feb

Air Canada flights from Seattle to London, Ontario

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

Air Canada

29 Jan

SEA8:00 p.m.Seattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 a.m.London

1 Feb

YXU5:40 p.m.London

7h 36m

1 stop

SEA10:16 p.m.Seattle/Tacoma Intl

C$ 382

Air Canada

29 Jan

SEA8:00 p.m.Seattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 a.m.London

1 Feb

YXU5:40 p.m.London

7h 36m

1 stop

SEA10:16 p.m.Seattle/Tacoma Intl

C$ 383

Air Canada

29 Jan

SEA8:00 p.m.Seattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 a.m.London

1 Feb

YXU5:10 a.m.London

12h 21m

2 stops

SEA2:31 p.m.Seattle/Tacoma Intl

C$ 390

United Airlines flights from Seattle to London, Ontario

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

United Airlines

4 Feb

SEA9:00 a.m.Seattle/Tacoma Intl

20h 46m

2 stops

YXU8:46 a.m.London

11 Feb

YXU5:40 p.m.London

7h 36m

1 stop

SEA10:16 p.m.Seattle/Tacoma Intl

C$ 507

United Airlines

4 Feb

SEA8:10 a.m.Seattle/Tacoma Intl

10h 10m

1 stop

YXU9:20 p.m.London

11 Feb

YXU5:40 p.m.London

7h 36m

1 stop

SEA10:16 p.m.Seattle/Tacoma Intl

C$ 528

United Airlines

20 Feb

SEA11:59 p.m.Seattle/Tacoma Intl

14h 06m

2 stops

YXU5:05 p.m.London

27 Feb

YXU9:25 a.m.London

14h 31m

2 stops

SEA8:56 p.m.Seattle/Tacoma Intl

C$ 529

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 29/1

8:00 p.m.-8:46 a.m.

2 stops9h 46m

London

Sun 1/2

5:40 p.m.-10:16 p.m.

1 stop7h 36m

C$ 382

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 29/1

8:00 p.m.-8:46 a.m.

2 stops9h 46m

London

Sun 1/2

5:40 p.m.-10:16 p.m.

1 stop7h 36m

C$ 383

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 29/1

8:00 p.m.-8:46 a.m.

2 stops9h 46m

London

Sun 1/2

5:10 a.m.-2:31 p.m.

2 stops12h 21m

C$ 390

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 29/1

8:10 a.m.-9:21 p.m.

1 stop10h 11m

London

Sun 1/2

5:40 p.m.-10:16 p.m.

1 stop7h 36m

C$ 409

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 29/1

8:00 p.m.-8:46 a.m.

2 stops9h 46m

London

Sun 1/2

5:10 a.m.-7:16 p.m.

2 stops17h 06m

C$ 416

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 10/2

8:10 a.m.-9:21 p.m.

1 stop10h 11m

London

Fri 13/2

9:25 a.m.-10:16 p.m.

1 stop15h 51m

C$ 442

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 4/2

9:00 a.m.-8:46 a.m.

2 stops20h 46m

London

Wed 11/2

5:40 p.m.-10:16 p.m.

1 stop7h 36m

C$ 507

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 4/2

8:10 a.m.-9:20 p.m.

1 stop10h 10m

London

Wed 11/2

5:40 p.m.-10:16 p.m.

1 stop7h 36m

C$ 528

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 20/2

11:59 p.m.-5:05 p.m.

2 stops14h 06m

London

Fri 27/2

9:25 a.m.-8:56 p.m.

2 stops14h 31m

C$ 529

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 29/1

12:57 p.m.-5:05 p.m.

3 stops25h 08m

London

Sun 1/2

5:10 a.m.-4:01 p.m.

2 stops13h 51m

C$ 536

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 68% 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

Fastest flight time	9h 05m
Direct flights	None

The fastest flight from Seattle to London, Ontario takes 9h 05m

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

Search flight deals

How far is Seattle/Tacoma Intl to London by plane?
London is 3215.2 km away from Seattle/Tacoma Intl. A reasonable flight in good conditions will take 9h 05m.
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?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, 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 required for your trip to London Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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 recognizable 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?

All flight searches from Seattle to London on momondo can be filtered to show those which offer flexible booking policies.

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

Once you have performed a search for Seattle to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to London from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.