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Cheap flights from Washington, D.C. Dulles Intl Airport to London from C$ 443

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to London departing on 7/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Washington, D.C. Dulles Intl Airport to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:00 p.m. - 5:20 a.m.
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
6:10 a.m. - 6:20 a.m.
YXU
-
IAD
24h 10m
2 stops
C$ 782Multiple Airlines
Mon, 7 Sep - Sun, 13 Sep
Multiple Airlines Logo
7:00 p.m. - 9:19 a.m.
IAD
-
YXU
14h 19m
2 stops
Multiple Airlines Logo
3:30 p.m. - 8:24 p.m.
YXU
-
IAD
4h 54m
1 stop
C$ 804Multiple Airlines
Mon, 31 Aug - Sun, 6 Sep
Multiple Airlines Logo
7:00 p.m. - 5:20 a.m.
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
10:05 a.m. - 3:24 p.m.
YXU
-
IAD
5h 19m
1 stop
C$ 815Multiple Airlines
Mon, 31 Aug - Sun, 6 Sep
Multiple Airlines Logo
7:00 p.m. - 5:20 a.m.
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
6:10 a.m. - 5:18 p.m.
YXU
-
IAD
35h 08m
2 stops
C$ 842Multiple Airlines
Mon, 31 Aug - Wed, 30 Sep
Multiple Airlines Logo
7:00 p.m. - 5:20 a.m.
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
6:10 a.m. - 5:18 p.m.
YXU
-
IAD
35h 08m
2 stops
C$ 902Multiple Airlines
Mon, 7 Sep - Sun, 13 Sep
Multiple Airlines Logo
7:00 p.m. - 5:20 a.m.
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
6:10 a.m. - 3:10 p.m.
YXU
-
IAD
33h 00m
3 stops
C$ 1,013Multiple Airlines
Mon, 7 Sep - Sun, 13 Sep
Air Canada Logo
9:55 a.m. - 2:50 p.m.
IAD
-
YXU
4h 55m
1 stop
Air Canada Logo
10:05 a.m. - 3:25 p.m.
YXU
-
IAD
5h 20m
1 stop
C$ 1,041Air Canada
Sat, 19 Sep - Wed, 23 Sep
Air Canada Logo
9:55 a.m. - 2:50 p.m.
IAD
-
YXU
4h 55m
1 stop
Air Canada Logo
10:05 a.m. - 3:25 p.m.
YXU
-
IAD
5h 20m
1 stop
C$ 1,042Air Canada
Sat, 19 Sep - Wed, 23 Sep
Air Canada Logo
9:55 a.m. - 2:50 p.m.
IAD
-
YXU
4h 55m
1 stop
Air Canada Logo
10:05 a.m. - 7:00 p.m.
YXU
-
IAD
8h 55m
2 stops
C$ 1,054Air Canada
Sat, 19 Sep - Wed, 23 Sep
Air Canada Logo
4:20 p.m. - 9:40 p.m.
IAD
-
YXU
5h 20m
1 stop
Air Canada Logo
3:30 p.m. - 8:25 p.m.
YXU
-
IAD
4h 55m
1 stop
C$ 1,056Air Canada
Mon, 7 Sep - Sun, 13 Sep

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Air Canada flights from Washington, D.C. Dulles Intl Airport to London, Ontario

Our best Air Canada deals on Washington, D.C. Dulles Intl Airport to London, Ontario flight tickets
Air Canada
19 Sep
IAD9:55 a.m.Washington, D.C. Dulles Intl
4h 55m
1 stop
YXU2:50 p.m.London
23 Sep
YXU10:05 a.m.London
5h 20m
1 stop
IAD3:25 p.m.Washington, D.C. Dulles Intl
C$ 1,041
Air Canada
19 Sep
IAD9:55 a.m.Washington, D.C. Dulles Intl
4h 55m
1 stop
YXU2:50 p.m.London
23 Sep
YXU10:05 a.m.London
5h 20m
1 stop
IAD3:25 p.m.Washington, D.C. Dulles Intl
C$ 1,042
Air Canada
19 Sep
IAD9:55 a.m.Washington, D.C. Dulles Intl
4h 55m
1 stop
YXU2:50 p.m.London
23 Sep
YXU10:05 a.m.London
8h 55m
2 stops
IAD7:00 p.m.Washington, D.C. Dulles Intl
C$ 1,054

United Airlines flights from Washington, D.C. Dulles Intl Airport to London, Ontario

Our best United Airlines deals on Washington, D.C. Dulles Intl Airport to London, Ontario flight tickets
United Airlines
31 Aug
IAD1:10 p.m.Washington, D.C. Dulles Intl
8h 30m
2 stops
YXU9:40 p.m.London
6 Sep
YXU10:05 a.m.London
6h 30m
2 stops
IAD4:35 p.m.Washington, D.C. Dulles Intl
C$ 1,171
United Airlines
31 Aug
IAD1:10 p.m.Washington, D.C. Dulles Intl
8h 30m
2 stops
YXU9:40 p.m.London
30 Sep
YXU10:05 a.m.London
7h 39m
2 stops
IAD5:44 p.m.Washington, D.C. Dulles Intl
C$ 1,267
United Airlines
21 Aug
IAD12:35 p.m.Washington, D.C. Dulles Intl
9h 05m
2 stops
YXU9:40 p.m.London
31 Aug
YXU3:30 p.m.London
4h 54m
1 stop
IAD8:24 p.m.Washington, D.C. Dulles Intl
C$ 1,349

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport 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 96,600 searches. Data last updated 3 August 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London, Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 7/9

7:00 p.m.-5:20 a.m.

1 stop10h 20m

London

Sun 13/9

6:10 a.m.-6:20 a.m.

2 stops24h 10m

C$ 782

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 31/8

7:00 p.m.-9:19 a.m.

2 stops14h 19m

London

Sun 6/9

3:30 p.m.-8:24 p.m.

1 stop4h 54m

C$ 804

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 31/8

7:00 p.m.-5:20 a.m.

1 stop10h 20m

London

Sun 6/9

10:05 a.m.-3:24 p.m.

1 stop5h 19m

C$ 815

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 31/8

7:00 p.m.-5:20 a.m.

1 stop10h 20m

London

Wed 30/9

6:10 a.m.-5:18 p.m.

2 stops35h 08m

C$ 842

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 7/9

7:00 p.m.-5:20 a.m.

1 stop10h 20m

London

Sun 13/9

6:10 a.m.-5:18 p.m.

2 stops35h 08m

C$ 902

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 7/9

7:00 p.m.-5:20 a.m.

1 stop10h 20m

London

Sun 13/9

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

3 stops33h 00m

C$ 1,013
Quickest round-trip

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 19/9

9:55 a.m.-2:50 p.m.

1 stop4h 55m

London

Wed 23/9

10:05 a.m.-3:25 p.m.

1 stop5h 20m

C$ 1,041

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 19/9

9:55 a.m.-2:50 p.m.

1 stop4h 55m

London

Wed 23/9

10:05 a.m.-3:25 p.m.

1 stop5h 20m

C$ 1,042

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 19/9

9:55 a.m.-2:50 p.m.

1 stop4h 55m

London

Wed 23/9

10:05 a.m.-7:00 p.m.

2 stops8h 55m

C$ 1,054

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 7/9

4:20 p.m.-9:40 p.m.

1 stop5h 20m

London

Sun 13/9

3:30 p.m.-8:25 p.m.

1 stop4h 55m

C$ 1,056

Flights are sorted by cheapest round-trip flights first.

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See travel insights to London from

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport 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 airline that flies from Washington, D.C. Dulles Intl to London?

Air Canada and WestJet are the most popular carriers operating from Washington, D.C. Dulles Intl to London

When to book flights from Washington, D.C. Dulles Intl Airport to London, Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to London, Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. Dulles Intl Airport to London, Ontario (IAD to YXU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to London, Ontario

Fastest flight time

4h 55m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to London, Ontario takes 4h 55m
There are no direct flights from Washington, D.C. Dulles Intl Airport to London, Ontario. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to London, Ontario.
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Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to London, Ontario

  • How far is Washington, D.C. Dulles Intl to London by plane?

    The distance between Washington, D.C. Dulles Intl and London is about 549.2 km. A reasonable flight in good conditions will take 4h 55m.

  • When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to London Airport?

    Prices for flights from Washington, D.C. Dulles Intl Airport to London Airport were last updated today.

  • How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to London 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 Washington, D.C. Dulles Intl Airport to London Airport.

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

    The travel and health documents you'll need for your trip to London Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Travelling 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, D.C. 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, D.C. to London for you.

Can I find flights from Washington, D.C. to London with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Washington, D.C. to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Washington, D.C. to London?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Washington, D.C..

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

Price alerts on flights to London from Washington, D.C. 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.

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