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Cheap flights from Washington to London from $463

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 3/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
3:10 pm - 6:35 am
SEA
-
YXU
12h 25m
1 stop
WestJet Logo
8:10 pm - 2:19 pm
YXU
-
SEA
21h 09m
1 stop
$463WestJet
Sun, Mar 22 - Sun, Mar 29
Air Canada Logo
8:00 pm - 5:03 pm
SEA
-
YXU
18h 03m
2 stops
Air Canada Logo
9:25 am - 7:18 pm
YXU
-
SEA
12h 53m
2 stops
$508Air Canada
Fri, Apr 10 - Wed, Apr 15
Air Canada Logo
8:00 pm - 8:46 am
SEA
-
YXU
9h 46m
2 stops
Air Canada Logo
5:10 am - 3:03 pm
YXU
-
SEA
12h 53m
2 stops
$516Air Canada
Sun, Mar 22 - Sun, Mar 29
Air Canada Logo
8:00 pm - 5:03 pm
SEA
-
YXU
18h 03m
2 stops
Air Canada Logo
9:25 am - 9:53 pm
YXU
-
SEA
15h 28m
1 stop
$528Air Canada
Fri, Apr 10 - Wed, Apr 15
Air Canada Logo
5:45 am - 9:21 pm
SEA
-
YXU
12h 36m
2 stops
Air Canada Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m
1 stop
$538Air Canada
Thu, Feb 26 - Sun, Mar 1
Air Canada Logo
5:45 am - 9:21 pm
SEA
-
YXU
12h 36m
2 stops
Air Canada Logo
5:10 am - 3:01 pm
YXU
-
SEA
12h 51m
2 stops
$543Air Canada
Thu, Feb 26 - Sun, Mar 1
Air Canada Logo
8:00 am - 9:21 pm
SEA
-
YXU
10h 21m
1 stop
Air Canada Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m
1 stop
$558Air Canada
Thu, Feb 26 - Sun, Mar 1
WestJet Logo
11:55 am - 6:35 am
SEA
-
YXU
15h 40m
2 stops
WestJet Logo
8:10 pm - 2:19 pm
YXU
-
SEA
21h 09m
1 stop
$559WestJet
Sun, Mar 22 - Sun, Mar 29
WestJet Logo
11:55 am - 6:35 am
SEA
-
YXU
15h 40m
3 stops
WestJet Logo
8:10 pm - 10:25 am
YXU
-
SEA
17h 15m
2 stops
$569WestJet
Sun, Mar 22 - Sun, Mar 29
WestJet Logo
11:55 am - 6:35 am
SEA
-
YXU
15h 40m
2 stops
WestJet Logo
8:10 pm - 2:19 pm
YXU
-
SEA
21h 09m
1 stop
$580WestJet
Sun, Mar 22 - Sun, Mar 29

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
Apr 10
SEA8:00 pmSeattle/Tacoma Intl
18h 03m
2 stops
YXU5:03 pmLondon
Apr 15
YXU9:25 amLondon
12h 53m
2 stops
SEA7:18 pmSeattle/Tacoma Intl
$508
Air Canada
Mar 22
SEA8:00 pmSeattle/Tacoma Intl
9h 46m
2 stops
YXU8:46 amLondon
Mar 29
YXU5:10 amLondon
12h 53m
2 stops
SEA3:03 pmSeattle/Tacoma Intl
$516
Air Canada
Apr 10
SEA8:00 pmSeattle/Tacoma Intl
18h 03m
2 stops
YXU5:03 pmLondon
Apr 15
YXU9:25 amLondon
15h 28m
1 stop
SEA9:53 pmSeattle/Tacoma Intl
$528

United Airlines flights from State of Washington to London, Ontario

Our best United Airlines deals on State of Washington to London, Ontario flight tickets
United Airlines
Mar 20
SEA11:59 pmSeattle/Tacoma Intl
14h 06m
2 stops
YXU5:05 pmLondon
Mar 27
YXU5:40 pmLondon
7h 36m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$601
United Airlines
Apr 10
SEA8:00 amSeattle/Tacoma Intl
10h 18m
1 stop
YXU9:18 pmLondon
Apr 15
YXU9:25 amLondon
15h 28m
1 stop
SEA9:53 pmSeattle/Tacoma Intl
$614
United Airlines
Mar 20
SEA11:59 pmSeattle/Tacoma Intl
14h 06m
2 stops
YXU5:05 pmLondon
Mar 27
YXU5:10 amLondon
20h 49m
2 stops
SEA10:59 pmSeattle/Tacoma Intl
$617

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 February 6, 2026.
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

Sun 3/22

3:10 pm-6:35 am

1 stop12h 25m

London

Sun 3/29

8:10 pm-2:19 pm

1 stop21h 09m

$463

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 4/10

8:00 pm-5:03 pm

2 stops18h 03m

London

Wed 4/15

9:25 am-7:18 pm

2 stops12h 53m

$508

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 3/22

8:00 pm-8:46 am

2 stops9h 46m

London

Sun 3/29

5:10 am-3:03 pm

2 stops12h 53m

$516

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 4/10

8:00 pm-5:03 pm

2 stops18h 03m

London

Wed 4/15

9:25 am-9:53 pm

1 stop15h 28m

$528

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 2/26

5:45 am-9:21 pm

2 stops12h 36m

London

Sun 3/1

5:40 pm-10:16 pm

1 stop7h 36m

$538

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 2/26

5:45 am-9:21 pm

2 stops12h 36m

London

Sun 3/1

5:10 am-3:01 pm

2 stops12h 51m

$543

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 2/26

8:00 am-9:21 pm

1 stop10h 21m

London

Sun 3/1

5:40 pm-10:16 pm

1 stop7h 36m

$558

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 3/22

11:55 am-6:35 am

2 stops15h 40m

London

Sun 3/29

8:10 pm-2:19 pm

1 stop21h 09m

$559

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 3/22

11:55 am-6:35 am

3 stops15h 40m

London

Sun 3/29

8:10 pm-10:25 am

2 stops17h 15m

$569

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 3/22

11:55 am-6:35 am

2 stops15h 40m

London

Sun 3/29

8:10 pm-2:19 pm

1 stop21h 09m

$580

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

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

You could potentially save up to 49% 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

Fastest flight time

10h 21m

Direct flights

None
The fastest flight from State of Washington to London, Ontario takes 10h 21m
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.
Search flight deals

  • 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
10,697 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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