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 48% 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.

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$ 920 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 p.m. - 2:05 p.m.SEA Seattle/Tacoma Intl-YXU London

18h 07m2 stops Denver Intl Orlando

6:15 a.m. - 10:49 a.m.YXU London-SEA Seattle/Tacoma Intl

31h 34m1 stop Fort Lauderdale

C$ 920Multiple Airlines

Wed, 16 Dec - Wed, 23 Dec

2:30 p.m. - 5:35 a.m.SEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

6:15 a.m. - 9:56 p.m.YXU London-SEA Seattle/Tacoma Intl

18h 41m1 stop Fort Lauderdale

C$ 1,014Multiple Airlines

Wed, 16 Dec - Wed, 23 Dec

2:30 p.m. - 5:35 a.m.SEA Seattle/Tacoma Intl-YXU London

12h 05m1 stop Calgary

6:40 a.m. - 1:53 p.m.YXU London-SEA Seattle/Tacoma Intl

58h 13m2 stops Calgary Los Angeles

C$ 1,236WestJet

Fri, 18 Dec - Fri, 25 Dec

12:31 p.m. - 5:35 a.m.SEA Seattle/Tacoma Intl-YXU London

14h 04m2 stops Los Angeles Calgary

6:40 a.m. - 1:53 p.m.YXU London-SEA Seattle/Tacoma Intl

58h 13m2 stops Calgary Los Angeles

C$ 1,313WestJet

Fri, 18 Dec - Fri, 25 Dec

8:40 a.m. - 9:52 p.m.SEA Seattle/Tacoma Intl-YXU London

10h 12m2 stops Vancouver Intl Toronto Pearson Intl

3:20 p.m. - 8:59 p.m.YXU London-SEA Seattle/Tacoma Intl

8h 39m1 stop Toronto Pearson Intl

C$ 1,364Air Canada

Tue, 12 Jan - Sat, 16 Jan

8:40 a.m. - 9:52 p.m.SEA Seattle/Tacoma Intl-YXU London

10h 12m2 stops Vancouver Intl Toronto Pearson Intl

5:30 a.m. - 2:37 p.m.YXU London-SEA Seattle/Tacoma Intl

12h 07m2 stops Toronto Pearson Intl Vancouver Intl

C$ 1,366Air Canada

Tue, 12 Jan - Sat, 16 Jan

8:40 a.m. - 9:52 p.m.SEA Seattle/Tacoma Intl-YXU London

10h 12m2 stops Vancouver Intl Toronto Pearson Intl

3:20 p.m. - 8:59 p.m.YXU London-SEA Seattle/Tacoma Intl

8h 39m1 stop Toronto Pearson Intl

C$ 1,380Air Canada

Tue, 12 Jan - Sat, 16 Jan

8:40 a.m. - 9:52 p.m.SEA Seattle/Tacoma Intl-YXU London

10h 12m2 stops Vancouver Intl Toronto Pearson Intl

5:30 a.m. - 2:37 p.m.YXU London-SEA Seattle/Tacoma Intl

12h 07m2 stops Toronto Pearson Intl Vancouver Intl

C$ 1,381Air Canada

Tue, 12 Jan - Sat, 16 Jan

7:45 a.m. - 8:37 a.m.SEA Seattle/Tacoma Intl-YXU London

21h 52m1 stop Toronto Pearson Intl

3:20 p.m. - 8:59 p.m.YXU London-SEA Seattle/Tacoma Intl

8h 39m1 stop Toronto Pearson Intl

C$ 1,398Air Canada

Tue, 12 Jan - Sat, 16 Jan

7:45 a.m. - 8:37 a.m.SEA Seattle/Tacoma Intl-YXU London

21h 52m1 stop Toronto Pearson Intl

3:20 p.m. - 8:59 p.m.YXU London-SEA Seattle/Tacoma Intl

8h 39m1 stop Toronto Pearson Intl

C$ 1,412Air Canada

Tue, 12 Jan - Sat, 16 Jan

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WestJet flights from Seattle to London, Ontario

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

WestJet

18 Dec

SEA2:30 p.m.Seattle/Tacoma Intl

12h 05m

1 stop

YXU5:35 a.m.London

25 Dec

YXU6:40 a.m.London

58h 13m

2 stops

SEA1:53 p.m.Seattle/Tacoma Intl

C$ 1,236

WestJet

18 Dec

SEA12:31 p.m.Seattle/Tacoma Intl

14h 04m

2 stops

YXU5:35 a.m.London

25 Dec

YXU6:40 a.m.London

58h 13m

2 stops

SEA1:53 p.m.Seattle/Tacoma Intl

C$ 1,313

WestJet

18 Dec

SEA2:30 p.m.Seattle/Tacoma Intl

12h 05m

1 stop

YXU5:35 a.m.London

25 Dec

YXU6:40 a.m.London

10h 00m

1 stop

SEA1:40 p.m.Seattle/Tacoma Intl

C$ 1,782

Air Canada flights from Seattle to London, Ontario

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

Air Canada

14 Nov

SEA7:45 a.m.Seattle/Tacoma Intl

9h 42m

1 stop

YXU8:27 p.m.London

16 Nov

YXU3:25 p.m.London

8h 34m

1 stop

SEA8:59 p.m.Seattle/Tacoma Intl

C$ 1,328

Air Canada

12 Jan

SEA8:40 a.m.Seattle/Tacoma Intl

10h 12m

2 stops

YXU9:52 p.m.London

16 Jan

YXU3:20 p.m.London

8h 39m

1 stop

SEA8:59 p.m.Seattle/Tacoma Intl

C$ 1,364

Air Canada

12 Jan

SEA8:40 a.m.Seattle/Tacoma Intl

10h 12m

2 stops

YXU9:52 p.m.London

16 Jan

YXU5:30 a.m.London

12h 07m

2 stops

SEA2:37 p.m.Seattle/Tacoma Intl

C$ 1,366

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Wed 16/12

4:58 p.m.-2:05 p.m.

2 stops18h 07m

London

Wed 23/12

6:15 a.m.-10:49 a.m.

1 stop31h 34m

C$ 920

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Wed 16/12

2:30 p.m.-5:35 a.m.

1 stop12h 05m

London

Wed 23/12

6:15 a.m.-9:56 p.m.

1 stop18h 41m

C$ 1,014

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Fri 18/12

2:30 p.m.-5:35 a.m.

1 stop12h 05m

London

Fri 25/12

6:40 a.m.-1:53 p.m.

2 stops58h 13m

C$ 1,236

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Fri 18/12

12:31 p.m.-5:35 a.m.

2 stops14h 04m

London

Fri 25/12

6:40 a.m.-1:53 p.m.

2 stops58h 13m

C$ 1,313

Quickest round-trip

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 12/1

8:40 a.m.-9:52 p.m.

2 stops10h 12m

London

Sat 16/1

3:20 p.m.-8:59 p.m.

1 stop8h 39m

C$ 1,364

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 12/1

8:40 a.m.-9:52 p.m.

2 stops10h 12m

London

Sat 16/1

5:30 a.m.-2:37 p.m.

2 stops12h 07m

C$ 1,366

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 12/1

8:40 a.m.-9:52 p.m.

2 stops10h 12m

London

Sat 16/1

3:20 p.m.-8:59 p.m.

1 stop8h 39m

C$ 1,380

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 12/1

8:40 a.m.-9:52 p.m.

2 stops10h 12m

London

Sat 16/1

5:30 a.m.-2:37 p.m.

2 stops12h 07m

C$ 1,381

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 12/1

7:45 a.m.-8:37 a.m.

1 stop21h 52m

London

Sat 16/1

3:20 p.m.-8:59 p.m.

1 stop8h 39m

C$ 1,398

SeattleLondon

SEA Seattle/Tacoma Intl - YXU London

SEAYXU

Seattle/Tacoma Intl

Tue 12/1

7:45 a.m.-8:37 a.m.

1 stop21h 52m

London

Sat 16/1

3:20 p.m.-8:59 p.m.

1 stop8h 39m

C$ 1,412

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 59% 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	C$ 920
Fastest flight time	18h 31m
Direct flights	None

The best flight deal from Seattle to London, Ontario found on momondo in the last 72 hours is C$ 920

The fastest flight from Seattle to London, Ontario takes 18h 31m

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?
London is 3215.2 km away from Seattle/Tacoma Intl. A reasonable flight in good conditions will take 18h 31m.
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.