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$ 399 Cheap Flights from Seattle to London in 2025/26

1 adult

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Find the cheapest flights from Seattle to London

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Cheap round-trip flights

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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$ 399Air Canada

Find Deal

Tue, 20 Jan - Thu, 22 Jan

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$ 424Air Canada

Find Deal

Tue, 20 Jan - Thu, 22 Jan

5:50 a.m. - 9:21 p.m.SEA-YXU

12h 31m2 stops

5:40 p.m. - 9:31 a.m.YXU-SEA

18h 51m2 stops

C$ 431Air Canada

Find Deal

Tue, 20 Jan - Thu, 22 Jan

5:50 a.m. - 9:21 p.m.SEA-YXU

12h 31m2 stops

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

17h 06m2 stops

C$ 433Air Canada

Find Deal

Tue, 20 Jan - Thu, 22 Jan

3:10 p.m. - 6:34 a.m.SEA-YXU

12h 24m1 stop

8:10 p.m. - 2:20 p.m.YXU-SEA

21h 10m1 stop

C$ 436WestJet

Find Deal

Tue, 6 Jan - Tue, 13 Jan

7:55 p.m. - 6:34 a.m.SEA-YXU

31h 39m2 stops

8:10 p.m. - 7:52 p.m.YXU-SEA

26h 42m1 stop

C$ 506Multiple Airlines

Find Deal

Tue, 6 Jan - Tue, 13 Jan

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

10h 11m2 stops

9:25 a.m. - 10:43 p.m.YXU-SEA

16h 18m3 stops

C$ 556United Airlines

Find Deal

Tue, 20 Jan - Thu, 22 Jan

3:45 p.m. - 6:34 a.m.SEA-YXU

11h 49m2 stops

8:10 p.m. - 8:58 a.m.YXU-SEA

15h 48m2 stops

C$ 719Multiple Airlines

Find Deal

Tue, 6 Jan - Tue, 13 Jan

10:55 p.m. - 6:34 a.m.SEA-YXU

28h 39m3 stops

8:10 p.m. - 7:35 a.m.YXU-SEA

14h 25m2 stops

C$ 924WestJet

Find Deal

Tue, 6 Jan - Tue, 13 Jan

10:55 p.m. - 6:34 a.m.SEA-YXU

28h 39m3 stops

8:10 p.m. - 4:40 p.m.YXU-SEA

23h 30m3 stops

C$ 977WestJet

Find Deal

Tue, 6 Jan - Tue, 13 Jan

Air Canada flights from Seattle to London, Ontario

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

Air Canada

20 Jan

SEA8:00 p.m.Seattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 a.m.London

22 Jan

YXU5:40 p.m.London

7h 36m

1 stop

SEA10:16 p.m.Seattle/Tacoma Intl

C$ 399

Find similar

Air Canada

20 Jan

SEA8:10 a.m.Seattle/Tacoma Intl

10h 11m

1 stop

YXU9:21 p.m.London

22 Jan

YXU5:40 p.m.London

7h 36m

1 stop

SEA10:16 p.m.Seattle/Tacoma Intl

C$ 424

Find similar

Air Canada

20 Jan

SEA5:50 a.m.Seattle/Tacoma Intl

12h 31m

2 stops

YXU9:21 p.m.London

22 Jan

YXU5:40 p.m.London

18h 51m

2 stops

SEA9:31 a.m.Seattle/Tacoma Intl

C$ 431

Find similar

WestJet flights from Seattle to London, Ontario

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

WestJet

6 Jan

SEA3:10 p.m.Seattle/Tacoma Intl

12h 24m

1 stop

YXU6:34 a.m.London

13 Jan

YXU8:10 p.m.London

21h 10m

1 stop

SEA2:20 p.m.Seattle/Tacoma Intl

C$ 436

Find similar

WestJet

6 Jan

SEA10:55 p.m.Seattle/Tacoma Intl

28h 39m

3 stops

YXU6:34 a.m.London

13 Jan

YXU8:10 p.m.London

14h 25m

2 stops

SEA7:35 a.m.Seattle/Tacoma Intl

C$ 924

Find similar

WestJet

6 Jan

SEA10:55 p.m.Seattle/Tacoma Intl

28h 39m

3 stops

YXU6:34 a.m.London

13 Jan

YXU8:10 p.m.London

23h 30m

3 stops

SEA4:40 p.m.Seattle/Tacoma Intl

C$ 977

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 20/1

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

2 stops9h 46m

London

Thu 22/1

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

1 stop7h 36m

C$ 399

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 20/1

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

1 stop10h 11m

London

Thu 22/1

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

1 stop7h 36m

C$ 424

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 20/1

5:50 a.m.-9:21 p.m.

2 stops12h 31m

London

Thu 22/1

5:40 p.m.-9:31 a.m.

2 stops18h 51m

C$ 431

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 20/1

5:50 a.m.-9:21 p.m.

2 stops12h 31m

London

Thu 22/1

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

2 stops17h 06m

C$ 433

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 6/1

3:10 p.m.-6:34 a.m.

1 stop12h 24m

London

Tue 13/1

8:10 p.m.-2:20 p.m.

1 stop21h 10m

C$ 436

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 6/1

7:55 p.m.-6:34 a.m.

2 stops31h 39m

London

Tue 13/1

8:10 p.m.-7:52 p.m.

1 stop26h 42m

C$ 506

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 20/1

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

2 stops10h 11m

London

Thu 22/1

9:25 a.m.-10:43 p.m.

3 stops16h 18m

C$ 556

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 6/1

3:45 p.m.-6:34 a.m.

2 stops11h 49m

London

Tue 13/1

8:10 p.m.-8:58 a.m.

2 stops15h 48m

C$ 719

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 6/1

10:55 p.m.-6:34 a.m.

3 stops28h 39m

London

Tue 13/1

8:10 p.m.-7:35 a.m.

2 stops14h 25m

C$ 924

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 6/1

10:55 p.m.-6:34 a.m.

3 stops28h 39m

London

Tue 13/1

8:10 p.m.-4:40 p.m.

3 stops23h 30m

C$ 977

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

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

Delta, WestJet, and United Airlines are the most popular carriers operating from Seattle/Tacoma Intl to London

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 47% 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 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

Direct flights	None

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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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 46m.
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.

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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.