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Cheap flights from Washington to London from $713

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to London departing on 5/5. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
8:20 am - 9:27 pmSEA-YXU
10h 07m2 stops
Air Canada Logo
6:15 am - 11:15 amYXU-SEA
8h 00m1 stop
$713Air Canada
Find Deal
Tue, May 5 - Wed, May 6
Air Canada Logo
5:40 am - 9:27 pmSEA-YXU
12h 47m2 stops
Air Canada Logo
9:55 am - 6:36 pmYXU-SEA
11h 41m2 stops
$718Air Canada
Find Deal
Tue, May 5 - Wed, May 6
WestJet Logo
7:05 am - 7:07 pmSEA-YXU
9h 02m1 stop
WestJet Logo
8:00 pm - 8:28 pmYXU-SEA
27h 28m1 stop
$721WestJet
Find Deal
Tue, May 5 - Wed, May 6
WestJet Logo
7:05 am - 7:07 pmSEA-YXU
9h 02m1 stop
WestJet Logo
8:00 pm - 8:28 pmYXU-SEA
27h 28m1 stop
$822WestJet
Find Deal
Tue, May 5 - Wed, May 6
United Airlines Logo
5:02 am - 8:46 amSEA-YXU
24h 44m2 stops
United Airlines Logo
9:25 am - 10:16 pmYXU-SEA
15h 51m1 stop
$1,011United Airlines
Find Deal
Sat, Dec 20 - Sat, Dec 27
United Airlines Logo
5:02 am - 8:46 amSEA-YXU
24h 44m2 stops
United Airlines Logo
5:10 am - 9:17 pmYXU-SEA
19h 07m2 stops
$1,352United Airlines
Find Deal
Sat, Dec 20 - Sat, Dec 27
United Airlines Logo
8:10 am - 9:21 pmSEA-YXU
10h 11m1 stop
United Airlines Logo
9:25 am - 10:16 pmYXU-SEA
15h 51m1 stop
$1,451United Airlines
Find Deal
Sat, Dec 20 - Sat, Dec 27
United Airlines Logo
5:02 am - 8:46 amSEA-YXU
24h 44m2 stops
United Airlines Logo
9:25 am - 12:03 pmYXU-SEA
29h 38m2 stops
$1,461United Airlines
Find Deal
Sat, Dec 20 - Sat, Dec 27
United Airlines Logo
5:02 am - 8:46 amSEA-YXU
24h 44m2 stops
United Airlines Logo
5:10 am - 11:12 pmYXU-SEA
21h 02m3 stops
$1,479United Airlines
Find Deal
Sat, Dec 20 - Sat, Dec 27

Air Canada flights from State of Washington to London, Ontario

Our best Air Canada deals on State of Washington to London, Ontario flight tickets
Air Canada
May 5
SEA8:20 amSeattle/Tacoma Intl
10h 07m
2 stops
YXU9:27 pmLondon
May 6
YXU6:15 amLondon
8h 00m
1 stop
SEA11:15 amSeattle/Tacoma Intl
$713
Find similar
Air Canada
May 5
SEA5:40 amSeattle/Tacoma Intl
12h 47m
2 stops
YXU9:27 pmLondon
May 6
YXU9:55 amLondon
11h 41m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
$718
Find similar

WestJet flights from State of Washington to London, Ontario

Our best WestJet deals on State of Washington to London, Ontario flight tickets
WestJet
May 5
SEA7:05 amSeattle/Tacoma Intl
9h 02m
1 stop
YXU7:07 pmLondon
May 6
YXU8:00 pmLondon
27h 28m
1 stop
SEA8:28 pmSeattle/Tacoma Intl
$721
Find similar
WestJet
May 5
SEA7:05 amSeattle/Tacoma Intl
9h 02m
1 stop
YXU7:07 pmLondon
May 6
YXU8:00 pmLondon
27h 28m
1 stop
SEA8:28 pmSeattle/Tacoma Intl
$822
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington to London, Ontario 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 832,500 searches. Data last updated November 6, 2025.
Use the filters below to find and compare flights from Washington to London, Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 5/5

8:20 am-9:27 pm

2 stops10h 07m

London

Wed 5/6

6:15 am-11:15 am

1 stop8h 00m

$713

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 5/5

5:40 am-9:27 pm

2 stops12h 47m

London

Wed 5/6

9:55 am-6:36 pm

2 stops11h 41m

$718

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 5/5

7:05 am-7:07 pm

1 stop9h 02m

London

Wed 5/6

8:00 pm-8:28 pm

1 stop27h 28m

$721

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 5/5

7:05 am-7:07 pm

1 stop9h 02m

London

Wed 5/6

8:00 pm-8:28 pm

1 stop27h 28m

$822

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 12/20

5:02 am-8:46 am

2 stops24h 44m

London

Sat 12/27

9:25 am-10:16 pm

1 stop15h 51m

$1,011

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 12/20

5:02 am-8:46 am

2 stops24h 44m

London

Sat 12/27

5:10 am-9:17 pm

2 stops19h 07m

$1,352

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 12/20

8:10 am-9:21 pm

1 stop10h 11m

London

Sat 12/27

9:25 am-10:16 pm

1 stop15h 51m

$1,451

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 12/20

5:02 am-8:46 am

2 stops24h 44m

London

Sat 12/27

9:25 am-12:03 pm

2 stops29h 38m

$1,461

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 12/20

5:02 am-8:46 am

2 stops24h 44m

London

Sat 12/27

5:10 am-11:12 pm

3 stops21h 02m

$1,479

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to London from

How to get the cheapest flight ticket from State of Washington 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 day to depart on your flight to London, Ontario?

According to our data, Thursday is the cheapest day to fly to London, Ontario from State of Washington. The lowest ticket price found for a Thursday departure recently was $244. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Tuesday as prices are generally higher than usual. According to our data, the average ticket price to London, Ontario on Tuesday is $680.

What is the cheapest time of day to depart on your flight to London, Ontario?

In the evening is the cheapest time of day to fly from State of Washington to London, Ontario when you can find flight prices for as low as $385. Flying to London, Ontario in the evening is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to London, Ontario, so prices are often more expensive at around $495 per ticket.

Can stopping save me money on State of Washington to London, Ontario flights?

You could potentially save up to 37% on your flight if you consider stops on a State of Washington to London, Ontario flight.

Cheap State of Washington to London, Ontario flight deals and tips

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

Direct flights

None
There are no direct flights from State of Washington to London, Ontario. There are no popular flight routes from State of Washington to London, Ontario.
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  • When did momondo last update prices for flights from Washington to London Airport?

    Prices for flights from Washington to London Airport refresh daily.

  • How many operators does momondo search for flights from Washington to London Airport?

  • How old do you have to be to fly from Washington to London Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to London Airport.

  • What documentation or ID do you need to fly to London Airport?

    The required travel and health documents for your London Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from State of Washington to London, Ontario

Compare and see reviews for airlines that fly from State of Washington to London, Ontario with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $460Free CancellationRating
7.1
10,416 reviews
Search Air Canada flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Grand Bend
Port Stanley

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington to London for you.

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

Yes. All flights to London from Washington on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo provides multiple filters to help you find the best flight to London from Washington. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Washington to London right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Washington to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

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