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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 445

IAD — LHR
5 Dec — 12 Dec1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in February or January, booked 71 days in advance, depart on a Monday or Tuesday and return on a Monday

Cheap flight deals from Dulles Intl to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Dulles Intl to Heathrow

Mon 23/117:40 p.m. -
1 stop18h 50m
Tue 8/1212:15 p.m. -
1 stop11h 15m
Deal found 2/11C$ 966
Mon 23/117:40 p.m. -
1 stop18h 50m
Thu 3/1212:15 p.m. -
1 stop11h 15m
Deal found 3/11C$ 968
Mon 23/117:40 p.m. -
1 stop18h 50m
Mon 7/128:35 p.m. -
1 stop26h 55m
Deal found 2/11C$ 969
Sat 5/128:30 p.m. -
1 stop16h 10m
Mon 7/126:40 a.m. -
2 stops15h 35m
Deal found 2/11C$ 991
Wed 25/117:40 p.m. -
1 stop18h 50m
Tue 8/1212:15 p.m. -
1 stop11h 15m
Deal found 1/11C$ 994
Tue 17/117:40 p.m. -
1 stop10h 10m
Sun 22/118:35 p.m. -
1 stop26h 55m
Deal found 31/10C$ 997
Tue 10/115:25 p.m. -
1 stop24h 15m
Tue 17/116:00 a.m. -
1 stop13h 40m
Deal found 4/11C$ 1,014
Wed 30/1210:30 p.m. -
1 stop12h 00m
Sun 17/17:55 p.m. -
1 stop24h 20m
Deal found 4/11C$ 1,019
Wed 30/1210:30 p.m. -
1 stop15h 25m
Thu 14/16:00 a.m. -
1 stop14h 15m
Deal found 4/11C$ 1,021
Sat 14/118:30 p.m. -
2 stops18h 25m
Mon 16/116:40 a.m. -
1 stop15h 35m
Deal found 3/11C$ 1,033
Fri 4/127:40 p.m. -
1 stop10h 10m
Wed 9/1212:15 p.m. -
1 stop11h 15m
Deal found 2/11C$ 1,036
Sat 5/127:40 p.m. -
1 stop18h 50m
Wed 9/1212:15 p.m. -
1 stop11h 15m
Deal found 4/11C$ 1,038

Find flight deals from Dulles Intl to Heathrow

Round-trip from

C$ 951

One-way from

C$ 445

Popular in

June

Cheapest in

February

Average price

C$ 1,233

Good round-trip deal

C$ 2,924 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 21/1-25/1
  • 4 total stops
  • 117h 05m total
  • Washington, D.C. to London
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ITA Airways
  • ITA Airways
  • 29/11-31/12
  • 1 total stop
  • 12h 10m total
  • Washington, D.C. to London
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Highest demand for flights based on searches. 17% potential increase in price (C$ 373 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 67 potential savings vs. average RT price).
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Average for round-trip flights in November 2026
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London Heathrow.
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Sun 7/2

10:15 p.m.-10:50 a.m.

Nonstop7h 35m

London Heathrow

Wed 31/12

12:00 a.m.-6:00 p.m.

Nonstop0h 00m

C$ 461

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Fri 12/3

7:40 p.m.-10:50 a.m.

1 stop10h 10m

London Heathrow

Wed 31/12

12:00 a.m.-6:00 p.m.

Nonstop0h 00m

C$ 464

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Wed 13/1

8:37 a.m.-7:10 a.m.

2 stops17h 33m

London Heathrow

Wed 31/12

12:00 a.m.-6:00 p.m.

Nonstop0h 00m

C$ 701
Quickest round-trip

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Thu 26/11

6:05 p.m.-6:15 a.m.

Nonstop7h 10m

London Heathrow

Wed 31/12

12:00 a.m.-6:00 p.m.

Nonstop0h 00m

C$ 760

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Fri 19/3

7:20 p.m.-6:40 a.m.

Nonstop7h 20m

London Heathrow

Wed 31/12

12:00 a.m.-6:00 p.m.

Nonstop0h 00m

C$ 788

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Wed 23/12

10:44 p.m.-9:20 p.m.

1 stop17h 36m

London Heathrow

Wed 31/12

12:00 a.m.-6:00 p.m.

Nonstop0h 00m

C$ 856

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Mon 22/3

10:10 p.m.-9:35 p.m.

3 stops19h 25m

London Heathrow

Wed 31/12

12:00 a.m.-6:00 p.m.

Nonstop0h 00m

C$ 986

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Sun 20/12

6:55 p.m.-7:20 a.m.

Nonstop7h 25m

London Heathrow

Wed 31/12

12:00 a.m.-6:00 p.m.

Nonstop0h 00m

C$ 1,064

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Tue 22/12

10:43 a.m.-7:05 a.m.

2 stops15h 22m

London Heathrow

Wed 31/12

12:00 a.m.-6:00 p.m.

Nonstop0h 00m

C$ 1,070

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Mon 30/11

8:30 p.m.-4:25 p.m.

2 stops14h 55m

London Heathrow

Wed 9/12

7:05 a.m.-5:15 p.m.

2 stops15h 10m

C$ 1,078

Flights are sorted by cheapest round-trip flights first.

Deals found on 31/10

Showing 1-10 of 22 resultsSorted by cheapest first
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Best time to book a flight from Dulles Intl to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Dulles Intl with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

The price you pay for your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 70 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of C$ 990). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,821). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IAD to LHR?

When flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Airfare is below average for this route at the moment.

Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights typically cost between C$ 1,005 and C$ 1,578 in January.
The cheapest round-trip price found within the last 5 days was C$ 951 on Scandinavian Airlines (21 Jan-25 Jan).

Related info for your journey

  • How long is the flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

    There are many flights that can get you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in 7h 20m. Fly via Scandinavian Airlines, United Airlines, or Delta to get the fastest option. There are 5897 km between Washington, D.C. Dulles Intl Airport and London Heathrow Airport. This flight may include one or multiple stops.

  • What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

    No one likes to see their flight delayed. When booking a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport consider choosing Air Canada (85%), Austrian Airlines (85%) or Iberia (82%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

    While on average a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is generally C$ 2,924, our data shows the cheapest flight currently is C$ 2,924. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay C$ 1,403 for that flight.

  • Can I find deals for flights from Dulles Intl to Heathrow that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Heathrow.

  • Can I find deals for business class flights from Dulles Intl to Heathrow?

    Yes. Cheapflights offers flight deals from Dulles Intl to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

    Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of C$ 990). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,821). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Gatwick
Romford
Twickenham
Ilford
Bromley
Sutton
Luton
Kingston upon Thames
Slough
Marlow
Cobham
Hounslow
Wembley
Leamington Spa
Northampton
Watford
High Wycombe
Stratford-upon-Avon
Moreton-in-Marsh

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