Which 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 55% of people opting to fly with this airline when travelling to London, Ontario. Keep in mind that there are 3 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, Air Canada, and United Airlines are the most popular carriers 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?

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$ 352 Cheap Flights from Seattle to London, Ontario in 2026

1 adult

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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 p.m. - 5:20 a.m.

SEA

YXU

6h 45m

1 stop

6:10 a.m. - 6:45 p.m.

YXU

SEA

15h 35m

1 stop

C$ 619WestJet

Wed, 23 Sep - Wed, 7 Oct

7:35 p.m. - 5:20 a.m.

SEA

YXU

6h 45m

1 stop

6:10 a.m. - 6:45 p.m.

YXU

SEA

15h 35m

1 stop

C$ 628WestJet

Wed, 23 Sep - Wed, 7 Oct

5:40 a.m. - 9:40 p.m.

SEA

YXU

13h 00m

2 stops

3:30 p.m. - 9:04 p.m.

YXU

SEA

8h 34m

1 stop

C$ 769Air Canada

Tue, 22 Sep - Wed, 7 Oct

7:20 p.m. - 9:20 a.m.

SEA

YXU

11h 00m

2 stops

3:30 p.m. - 9:04 p.m.

YXU

SEA

8h 34m

1 stop

C$ 788Air Canada

Wed, 23 Sep - Wed, 7 Oct

5:40 a.m. - 9:40 p.m.

SEA

YXU

13h 00m

2 stops

10:05 a.m. - 6:32 p.m.

YXU

SEA

11h 27m

2 stops

C$ 797Air Canada

Wed, 23 Sep - Wed, 7 Oct

8:00 a.m. - 9:40 p.m.

SEA

YXU

10h 40m

1 stop

3:30 p.m. - 9:04 p.m.

YXU

SEA

8h 34m

1 stop

C$ 813Air Canada

Tue, 22 Sep - Wed, 7 Oct

8:00 a.m. - 5:45 p.m.

SEA

YXU

6h 45m

1 stop

3:30 p.m. - 9:07 p.m.

YXU

SEA

8h 37m

1 stop

C$ 815Air Canada

Tue, 14 Jul - Fri, 17 Jul

7:20 p.m. - 9:20 a.m.

SEA

YXU

11h 00m

2 stops

3:30 p.m. - 9:07 p.m.

YXU

SEA

8h 37m

1 stop

C$ 822Air Canada

Tue, 14 Jul - Fri, 17 Jul

7:20 p.m. - 9:20 a.m.

SEA

YXU

11h 00m

2 stops

3:30 p.m. - 10:42 p.m.

YXU

SEA

10h 12m

2 stops

C$ 828Air Canada

Tue, 14 Jul - Fri, 17 Jul

3:00 p.m. - 9:20 a.m.

SEA

YXU

15h 20m

2 stops

10:05 a.m. - 6:32 p.m.

YXU

SEA

11h 27m

2 stops

C$ 855Air Canada

Tue, 7 Jul - Tue, 14 Jul

Air Canada flights from Seattle to London, Ontario

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

Air Canada

22 Sep

SEA5:40 a.m.Seattle/Tacoma Intl

13h 00m

2 stops

YXU9:40 p.m.London

7 Oct

YXU3:30 p.m.London

8h 34m

1 stop

SEA9:04 p.m.Seattle/Tacoma Intl

C$ 769

Air Canada

23 Sep

SEA7:20 p.m.Seattle/Tacoma Intl

11h 00m

2 stops

YXU9:20 a.m.London

7 Oct

YXU3:30 p.m.London

8h 34m

1 stop

SEA9:04 p.m.Seattle/Tacoma Intl

C$ 788

Air Canada

23 Sep

SEA5:40 a.m.Seattle/Tacoma Intl

13h 00m

2 stops

YXU9:40 p.m.London

7 Oct

YXU10:05 a.m.London

11h 27m

2 stops

SEA6:32 p.m.Seattle/Tacoma Intl

C$ 797

WestJet flights from Seattle to London, Ontario

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

WestJet

23 Sep

SEA7:35 p.m.Seattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 a.m.London

7 Oct

YXU6:10 a.m.London

15h 35m

1 stop

SEA6:45 p.m.Seattle/Tacoma Intl

C$ 619

WestJet

23 Sep

SEA7:35 p.m.Seattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 a.m.London

7 Oct

YXU6:10 a.m.London

15h 35m

1 stop

SEA6:45 p.m.Seattle/Tacoma Intl

C$ 628

WestJet

5 Jun

SEA7:35 p.m.Seattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 a.m.London

13 Jun

YXU6:10 a.m.London

15h 35m

1 stop

SEA6:45 p.m.Seattle/Tacoma Intl

C$ 956

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 23/9

7:35 p.m.-5:20 a.m.

1 stop6h 45m

London

Wed 7/10

6:10 a.m.-6:45 p.m.

1 stop15h 35m

C$ 619

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 23/9

7:35 p.m.-5:20 a.m.

1 stop6h 45m

London

Wed 7/10

6:10 a.m.-6:45 p.m.

1 stop15h 35m

C$ 628

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 22/9

5:40 a.m.-9:40 p.m.

2 stops13h 00m

London

Wed 7/10

3:30 p.m.-9:04 p.m.

1 stop8h 34m

C$ 769

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 23/9

7:20 p.m.-9:20 a.m.

2 stops11h 00m

London

Wed 7/10

3:30 p.m.-9:04 p.m.

1 stop8h 34m

C$ 788

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 23/9

5:40 a.m.-9:40 p.m.

2 stops13h 00m

London

Wed 7/10

10:05 a.m.-6:32 p.m.

2 stops11h 27m

C$ 797

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 22/9

8:00 a.m.-9:40 p.m.

1 stop10h 40m

London

Wed 7/10

3:30 p.m.-9:04 p.m.

1 stop8h 34m

C$ 813

Quickest round-trip

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 14/7

8:00 a.m.-5:45 p.m.

1 stop6h 45m

London

Fri 17/7

3:30 p.m.-9:07 p.m.

1 stop8h 37m

C$ 815

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 14/7

7:20 p.m.-9:20 a.m.

2 stops11h 00m

London

Fri 17/7

3:30 p.m.-9:07 p.m.

1 stop8h 37m

C$ 822

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 14/7

7:20 p.m.-9:20 a.m.

2 stops11h 00m

London

Fri 17/7

3:30 p.m.-10:42 p.m.

2 stops10h 12m

C$ 828

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 7/7

3:00 p.m.-9:20 a.m.

2 stops15h 20m

London

Tue 14/7

10:05 a.m.-6:32 p.m.

2 stops11h 27m

C$ 855

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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 70% 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	6h 45m
Direct flights	None

The fastest flight from Seattle to London, Ontario takes 6h 45m

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

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Frequently asked questions about flying from Seattle to London, Ontario

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 6h 45m.
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.