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$ 505 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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3:10 p.m. - 7:12 p.m.SEA-YXU

25h 02m1 stop

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

21h 10m1 stop

C$ 723WestJet

Find Deal

Sun, 23 Nov - Sun, 30 Nov

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

12h 31m2 stops

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

7h 36m1 stop

C$ 790Air Canada

Find Deal

Tue, 16 Dec - Mon, 22 Dec

11:55 a.m. - 7:12 p.m.SEA-YXU

52h 17m2 stops

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

21h 10m1 stop

C$ 799WestJet

Find Deal

Sun, 23 Nov - Sun, 30 Nov

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$ 833Air Canada

Find Deal

Tue, 16 Dec - Mon, 22 Dec

11:30 p.m. - 5:05 p.m.SEA-YXU

14h 35m2 stops

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

7h 36m1 stop

C$ 868United Airlines

Find Deal

Sat, 22 Nov - Sat, 29 Nov

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$ 886United Airlines

Find Deal

Sat, 22 Nov - Sat, 29 Nov

3:12 p.m. - 6:34 a.m.SEA-YXU

12h 22m2 stops

8:10 p.m. - 10:04 a.m.YXU-SEA

16h 54m2 stops

C$ 950Multiple Airlines

Find Deal

Tue, 16 Dec - Mon, 22 Dec

11:30 p.m. - 5:05 p.m.SEA-YXU

14h 35m2 stops

5:15 a.m. - 12:59 a.m.YXU-SEA

22h 44m2 stops

C$ 1,062United Airlines

Find Deal

Sat, 22 Nov - Sat, 29 Nov

11:55 a.m. - 7:12 p.m.SEA-YXU

28h 17m2 stops

8:10 p.m. - 10:22 a.m.YXU-SEA

17h 12m2 stops

C$ 1,075WestJet

Find Deal

Sun, 23 Nov - Sun, 30 Nov

12:10 a.m. - 5:05 p.m.SEA-YXU

13h 55m2 stops

5:15 a.m. - 10:21 p.m.YXU-SEA

20h 06m2 stops

C$ 1,076United Airlines

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Sat, 22 Nov - Sun, 30 Nov

WestJet flights from Seattle to London, Ontario

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

WestJet

23 Nov

SEA3:10 p.m.Seattle/Tacoma Intl

25h 02m

1 stop

YXU7:12 p.m.London

30 Nov

YXU8:10 p.m.London

21h 10m

1 stop

SEA2:20 p.m.Seattle/Tacoma Intl

C$ 723

Find similar

WestJet

23 Nov

SEA11:55 a.m.Seattle/Tacoma Intl

52h 17m

2 stops

YXU7:12 p.m.London

30 Nov

YXU8:10 p.m.London

21h 10m

1 stop

SEA2:20 p.m.Seattle/Tacoma Intl

C$ 799

Find similar

WestJet

23 Nov

SEA11:55 a.m.Seattle/Tacoma Intl

28h 17m

2 stops

YXU7:12 p.m.London

30 Nov

YXU8:10 p.m.London

17h 12m

2 stops

SEA10:22 a.m.Seattle/Tacoma Intl

C$ 1,075

Find similar

United Airlines flights from Seattle to London, Ontario

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

United Airlines

22 Nov

SEA11:30 p.m.Seattle/Tacoma Intl

14h 35m

2 stops

YXU5:05 p.m.London

29 Nov

YXU5:40 p.m.London

7h 36m

1 stop

SEA10:16 p.m.Seattle/Tacoma Intl

C$ 868

Find similar

United Airlines

22 Nov

SEA8:10 a.m.Seattle/Tacoma Intl

10h 11m

1 stop

YXU9:21 p.m.London

29 Nov

YXU5:40 p.m.London

7h 36m

1 stop

SEA10:16 p.m.Seattle/Tacoma Intl

C$ 886

Find similar

United Airlines

22 Nov

SEA11:30 p.m.Seattle/Tacoma Intl

14h 35m

2 stops

YXU5:05 p.m.London

29 Nov

YXU5:15 a.m.London

22h 44m

2 stops

SEA12:59 a.m.Seattle/Tacoma Intl

C$ 1,062

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 23/11

3:10 p.m.-7:12 p.m.

1 stop25h 02m

London

Sun 30/11

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

1 stop21h 10m

C$ 723

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 16/12

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

2 stops12h 31m

London

Mon 22/12

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

1 stop7h 36m

C$ 790

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 23/11

11:55 a.m.-7:12 p.m.

2 stops52h 17m

London

Sun 30/11

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

1 stop21h 10m

C$ 799

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 16/12

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

1 stop10h 11m

London

Mon 22/12

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

1 stop7h 36m

C$ 833

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 22/11

11:30 p.m.-5:05 p.m.

2 stops14h 35m

London

Sat 29/11

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

1 stop7h 36m

C$ 868

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 22/11

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

1 stop10h 11m

London

Sat 29/11

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

1 stop7h 36m

C$ 886

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 16/12

3:12 p.m.-6:34 a.m.

2 stops12h 22m

London

Mon 22/12

8:10 p.m.-10:04 a.m.

2 stops16h 54m

C$ 950

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 22/11

11:30 p.m.-5:05 p.m.

2 stops14h 35m

London

Sat 29/11

5:15 a.m.-12:59 a.m.

2 stops22h 44m

C$ 1,062

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 23/11

11:55 a.m.-7:12 p.m.

2 stops28h 17m

London

Sun 30/11

8:10 p.m.-10:22 a.m.

2 stops17h 12m

C$ 1,075

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 22/11

12:10 a.m.-5:05 p.m.

2 stops13h 55m

London

Sun 30/11

5:15 a.m.-10:21 p.m.

2 stops20h 06m

C$ 1,076

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

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 45% 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 10h 11m.
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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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.