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Cheap flights from London, Ontario to Seattle from C$ 294

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London, Ontario to Seattle departing on 13/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London, Ontario to Seattle

Cheap round-trip flights

Multiple Airlines Logo
YXU-SEA
5181 kmmulti-stop
Multiple Airlines Logo
SEA-YXU
5181 kmmulti-stop
Multiple Airlines
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momondo Fare Finder

 
Customize your flight search to find flights from London, Ontario to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 96,600 searches. Data last updated 31 July 2025.
Use the filters below to find and compare flights from London, Ontario to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 13/9

8:00 p.m.-12:33 p.m.

2 stops19h 33m

C$ 294

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 14/9

6:10 a.m.-10:59 a.m.

1 stop7h 49m

C$ 305

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 13/9

6:10 a.m.-10:59 a.m.

1 stop7h 49m

C$ 306

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 14/9

6:00 a.m.-11:42 p.m.

2 stops20h 42m

C$ 428

LondonSeattle

YXU - SEA

YXUSEA

London

Sat 13/9

8:00 p.m.-5:10 p.m.

3 stops24h 10m

C$ 457

LondonSeattle

YXU - SEA

YXUSEA

London

Sun 14/9

8:00 p.m.-1:43 p.m.

3 stops20h 43m

C$ 468

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Seattle from

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 day to depart on your flight to Seattle?

Our data shows that Friday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 369. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around C$ 703. These prices are subject to change though, so be sure to set up a Price Alert for flights to Seattle.

What is the cheapest time of day to depart on your flight to Seattle?

Our most recent data shows that the best time of day to fly to Seattle is in the afternoon. Flights from London, Ontario to Seattle during this time can be as low as C$ 556. Flights in the morning are often more expensive with an average ticket price of C$ 565.

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 49m

Direct flights

None

Airports in Seattle

1 airport
The fastest flight from London, Ontario to Seattle takes 7h 49m
There are no direct flights from London, Ontario to Seattle. Popular non-direct route for this connection is London Airport - Seattle/Tacoma Intl Airport.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
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  • How far is London to Seattle/Tacoma Intl by plane?

    The distance between London and Seattle/Tacoma Intl is about 3215.2 km.

  • 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?

  • 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?

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
WestJetPriceFrom C$ 240Free CancellationRating
7.2
2,978 reviews
Search WestJet flights
United AirlinesPriceFrom C$ 278Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
Air CanadaPriceFrom C$ 361Free CancellationRating
7.1
9,851 reviews
Search Air Canada flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Marysville
Lynnwood
SeaTac
Tacoma
Olympia
Ellensburg
Kirkland
Redmond
Ocean Shores
Shoreline
Tukwila
Renton
Mukilteo
Gig Harbor
Cle Elum
Poulsbo
Puyallup
Centralia
Kent

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.

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