When did momondo last update prices for flights from London Airport to Seattle/Tacoma Intl Airport?

Prices for flights from London Airport to Seattle/Tacoma Intl Airport were last updated today.

How many operators does momondo search for flights from London Airport to Seattle/Tacoma Intl Airport?

The number of operators available for flights from London Airport to Seattle/Tacoma Intl Airport is 3 as of January 2026.

How old do you have to be to fly from London Airport to Seattle/Tacoma Intl Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Airport to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

C$ 213 Cheap Flights from London to Seattle in 2026

1 adult

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Find the cheapest flights from London, Ontario to Seattle

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:15 a.m. - 12:43 p.m.

YXU

SEA

9h 28m

2 stops

7:35 p.m. - 5:25 a.m.

SEA

YXU

6h 50m

1 stop

C$ 566Multiple Airlines

Sat, 2 May - Sat, 9 May

8:10 p.m. - 2:19 p.m.

YXU

SEA

21h 09m

1 stop

3:10 p.m. - 6:35 a.m.

SEA

YXU

12h 25m

1 stop

C$ 576WestJet

Sun, 8 Mar - Wed, 11 Mar

6:15 a.m. - 7:35 a.m.

YXU

SEA

28h 20m

2 stops

7:35 p.m. - 5:25 a.m.

SEA

YXU

6h 50m

1 stop

C$ 588WestJet

Sat, 2 May - Sat, 9 May

6:15 a.m. - 6:45 p.m.

YXU

SEA

15h 30m

1 stop

7:35 p.m. - 5:25 a.m.

SEA

YXU

6h 50m

1 stop

C$ 611WestJet

Sat, 2 May - Sat, 9 May

8:10 p.m. - 10:25 a.m.

YXU

SEA

17h 15m

2 stops

3:10 p.m. - 6:35 a.m.

SEA

YXU

12h 25m

1 stop

C$ 622WestJet

Sun, 8 Mar - Wed, 11 Mar

6:15 a.m. - 7:52 p.m.

YXU

SEA

16h 37m

1 stop

7:35 p.m. - 5:25 a.m.

SEA

YXU

6h 50m

1 stop

C$ 633Multiple Airlines

Sat, 2 May - Sat, 9 May

8:10 p.m. - 10:25 a.m.

YXU

SEA

17h 15m

2 stops

3:10 p.m. - 6:35 a.m.

SEA

YXU

12h 25m

1 stop

C$ 650WestJet

Sun, 8 Mar - Wed, 11 Mar

5:10 a.m. - 2:01 p.m.

YXU

SEA

12h 51m

2 stops

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

SEA

YXU

9h 46m

2 stops

C$ 739Air Canada

Sun, 8 Mar - Wed, 11 Mar

5:10 a.m. - 2:01 p.m.

YXU

SEA

12h 51m

2 stops

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

SEA

YXU

9h 46m

2 stops

C$ 740Air Canada

Sun, 8 Mar - Wed, 11 Mar

5:10 a.m. - 2:01 p.m.

YXU

SEA

12h 51m

2 stops

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

SEA

YXU

9h 46m

2 stops

C$ 744Air Canada

Sun, 8 Mar - Wed, 11 Mar

United Airlines flights from London, Ontario to Seattle

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

United Airlines

17 Jun

YXU6:00 a.m.London

7h 20m

1 stop

SEA10:20 a.m.Seattle/Tacoma Intl

25 Jun

SEA11:30 a.m.Seattle/Tacoma Intl

7h 07m

1 stop

YXU9:37 p.m.London

C$ 900

United Airlines

17 Jun

YXU6:00 a.m.London

15h 09m

2 stops

SEA6:09 p.m.Seattle/Tacoma Intl

25 Jun

SEA11:30 a.m.Seattle/Tacoma Intl

7h 07m

1 stop

YXU9:37 p.m.London

C$ 949

United Airlines

17 Jun

YXU12:20 p.m.London

13h 09m

2 stops

SEA10:29 p.m.Seattle/Tacoma Intl

25 Jun

SEA5:00 p.m.Seattle/Tacoma Intl

21h 32m

3 stops

YXU5:32 p.m.London

C$ 1,719

Air Canada flights from London, Ontario to Seattle

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

Air Canada

8 Mar

YXU5:10 a.m.London

12h 51m

2 stops

SEA2:01 p.m.Seattle/Tacoma Intl

11 Mar

SEA8:00 p.m.Seattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 a.m.London

C$ 739

Air Canada

8 Mar

YXU5:10 a.m.London

12h 51m

2 stops

SEA2:01 p.m.Seattle/Tacoma Intl

11 Mar

SEA8:00 p.m.Seattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 a.m.London

C$ 740

Air Canada

8 Mar

YXU5:10 a.m.London

12h 51m

2 stops

SEA2:01 p.m.Seattle/Tacoma Intl

11 Mar

SEA8:00 p.m.Seattle/Tacoma Intl

9h 46m

2 stops

YXU8:46 a.m.London

C$ 744

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 2/5

6:15 a.m.-12:43 p.m.

2 stops9h 28m

Seattle/Tacoma Intl

Sat 9/5

7:35 p.m.-5:25 a.m.

1 stop6h 50m

C$ 566

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 8/3

8:10 p.m.-2:19 p.m.

1 stop21h 09m

Seattle/Tacoma Intl

Wed 11/3

3:10 p.m.-6:35 a.m.

1 stop12h 25m

C$ 576

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 2/5

6:15 a.m.-7:35 a.m.

2 stops28h 20m

Seattle/Tacoma Intl

Sat 9/5

7:35 p.m.-5:25 a.m.

1 stop6h 50m

C$ 588

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 2/5

6:15 a.m.-6:45 p.m.

1 stop15h 30m

Seattle/Tacoma Intl

Sat 9/5

7:35 p.m.-5:25 a.m.

1 stop6h 50m

C$ 611

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 8/3

8:10 p.m.-10:25 a.m.

2 stops17h 15m

Seattle/Tacoma Intl

Wed 11/3

3:10 p.m.-6:35 a.m.

1 stop12h 25m

C$ 622

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 2/5

6:15 a.m.-7:52 p.m.

1 stop16h 37m

Seattle/Tacoma Intl

Sat 9/5

7:35 p.m.-5:25 a.m.

1 stop6h 50m

C$ 633

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 8/3

8:10 p.m.-10:25 a.m.

2 stops17h 15m

Seattle/Tacoma Intl

Wed 11/3

3:10 p.m.-6:35 a.m.

1 stop12h 25m

C$ 650

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 8/3

5:10 a.m.-2:01 p.m.

2 stops12h 51m

Seattle/Tacoma Intl

Wed 11/3

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

2 stops9h 46m

C$ 739

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 8/3

5:10 a.m.-2:01 p.m.

2 stops12h 51m

Seattle/Tacoma Intl

Wed 11/3

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

2 stops9h 46m

C$ 740

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 8/3

5:10 a.m.-2:01 p.m.

2 stops12h 51m

Seattle/Tacoma Intl

Wed 11/3

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

2 stops9h 46m

C$ 744

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from London, Ontario to Seattle

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 London to Seattle/Tacoma Intl?

WestJet is the most popular carrier operating from London to Seattle/Tacoma Intl

Which airlines fly to Seattle?

Alaska Airlines, Air Canada and WestJet are the top three most popular airlines that fly to Seattle from London, Ontario according to our data. Alaska Airlines is the first choice among our users, with 38% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 6 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

When to book flights from London, Ontario to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from London, Ontario to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap London, Ontario to Seattle (YXU to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London, Ontario to Seattle

Fastest flight time	7h 36m
Direct flights	None

The fastest flight from London, Ontario to Seattle takes 7h 36m

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

Search flight deals

How far is London to Seattle/Tacoma Intl by plane?
The distance between London and Seattle/Tacoma Intl is about 3215.2 km. By plane, this route typically takes 7h 36m.
When did momondo last update prices for flights from London Airport to Seattle/Tacoma Intl Airport?
Prices for flights from London Airport to Seattle/Tacoma Intl Airport were last updated today.
How many operators does momondo search for flights from London Airport to Seattle/Tacoma Intl Airport?
The number of operators available for flights from London Airport to Seattle/Tacoma Intl Airport is 3 as of January 2026.
How old do you have to be to fly from London Airport to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from London, Ontario to Seattle?
Based on momondo bookings for flights between London, Ontario and Seattle, the leading airline is WestJet, making up 54% of the total bookings. Other popular airlines include United Airlines with 30% and Air Canada with 16%.

Best airlines flying from London, Ontario to Seattle

Compare and see reviews for airlines that fly from London, Ontario to Seattle with momondo

Airline	Rating	Free Cancellation	Price
WestJet	PriceFrom C$ 238	Free Cancellation	Rating 7.2 3,253 reviews	Search WestJet flights
United Airlines	PriceFrom C$ 273	Free Cancellation	Rating 7.4 9,215 reviews	Search United Airlines flights
Air Canada	PriceFrom C$ 362	Free Cancellation	Rating 7.1 10,667 reviews	Search Air Canada flights

Lynnwood

Leavenworth

Tacoma

Marysville

SeaTac

Redmond

Kirkland

Tukwila

Olympia

Ocean Shores

Bainbridge Island

Ellensburg

Gig Harbor

Renton

Mukilteo

Cle Elum

Centralia

Puyallup

Kent

Edmonds

Why use momondo?

Why should I use momondo to find a flight deal from London to Seattle?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Seattle . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from London to Seattle with flexible booking policies on momondo?

Flights from London to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for London to Seattle 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 London to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of London to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.