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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 459

IAD — LHR
17 Oct — 24 Oct1
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 Friday 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 12/108:30 p.m. -
1 stop10h 25m
Wed 21/109:25 p.m. -
1 stop26h 55m
Deal found 14/9C$ 968
Sun 11/1011:20 p.m. -
1 stop31h 35m
Thu 22/109:25 p.m. -
1 stop26h 55m
Deal found 14/9C$ 971
Tue 29/98:30 p.m. -
1 stop10h 25m
Tue 6/109:25 p.m. -
1 stop29h 50m
Deal found 13/9C$ 978
Thu 5/118:30 p.m. -
2 stops56h 05m
Mon 9/116:40 a.m. -
2 stops15h 35m
Deal found 15/9C$ 985
Tue 29/96:35 p.m. -
Nonstop7h 20m
Wed 28/109:00 a.m. -
1 stop13h 00m
Deal found 16/9C$ 989
Wed 14/106:35 p.m. -
Nonstop7h 20m
Tue 27/1012:05 p.m. -
1 stop33h 55m
Deal found 16/9C$ 992
Wed 21/1010:05 p.m. -
Nonstop7h 35m
Wed 28/109:00 a.m. -
1 stop13h 00m
Deal found 16/9C$ 994
Wed 14/106:35 p.m. -
Nonstop7h 20m
Thu 22/108:45 a.m. -
1 stop13h 00m
Deal found 14/9C$ 996
Sat 26/910:40 p.m. -
1 stop17h 40m
Tue 6/108:45 a.m. -
1 stop13h 00m
Deal found 17/9C$ 997
Sun 11/1010:05 p.m. -
Nonstop7h 35m
Mon 19/109:05 a.m. -
1 stop33h 55m
Deal found 16/9C$ 999
Sat 3/105:40 p.m. -
1 stop31h 50m
Wed 14/108:40 a.m. -
1 stop13h 05m
Deal found 14/9C$ 1,000

Find flight deals from Dulles Intl to Heathrow

Round-trip from

C$ 968

One-way from

C$ 459

Popular in

June

Cheapest in

February

Average price

C$ 1,290

Good round-trip deal

C$ 2,921 or less
Icelandair
  • Icelandair
  • 12/10-21/10
  • 2 total stops
  • 37h 20m total
  • Washington, D.C. to London
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Delta
  • Delta
  • 10/3-31/12
  • 2 total stops
  • 14h 45m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (C$ 416 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease (C$ 71 potential savings vs. average RT price).
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Average for round-trip flights in September 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

Thu 5/11

4:30 p.m.-9:40 a.m.

1 stop12h 10m

London Heathrow

Wed 31/12

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

Nonstop0h 00m

C$ 494

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Sun 13/12

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$ 495

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Wed 16/12

9:55 a.m.-7:10 a.m.

1 stop16h 15m

London Heathrow

Wed 31/12

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

Nonstop0h 00m

C$ 499

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Tue 15/12

9:55 a.m.-7:10 a.m.

1 stop16h 15m

London Heathrow

Wed 31/12

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

Nonstop0h 00m

C$ 499

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Fri 12/3

7:30 p.m.-7:55 a.m.

Nonstop7h 25m

London Heathrow

Wed 31/12

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

Nonstop0h 00m

C$ 523

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Sat 12/12

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

Nonstop7h 20m

London Heathrow

Wed 31/12

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

Nonstop0h 00m

C$ 523

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Mon 5/10

5:40 p.m.-6:50 p.m.

1 stop20h 10m

London Heathrow

Wed 31/12

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

Nonstop0h 00m

C$ 618

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Sun 8/11

10:30 p.m.-5:30 p.m.

1 stop14h 00m

London Heathrow

Wed 31/12

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

Nonstop0h 00m

C$ 618

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Mon 21/12

12:40 p.m.-11:20 a.m.

2 stops17h 40m

London Heathrow

Wed 31/12

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

Nonstop0h 00m

C$ 623

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Tue 27/10

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

Nonstop7h 25m

London Heathrow

Wed 31/12

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

Nonstop0h 00m

C$ 640

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/9

Showing 1-10 of 24 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$ 966). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,817). 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$ 999 and C$ 1,570 in October.
The cheapest round-trip price found within the last 5 days was C$ 968 on Icelandair (12 Oct-22 Oct).

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 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 Aer Lingus (73%), Iberia (73%) or KLM (68%) 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$ 2,921, our data shows the cheapest flight currently is C$ 2,921. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay C$ 1,349 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$ 966). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,817). 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
Slough
Marlow
Cobham
Hounslow
Leamington Spa
Wembley
Northampton
Watford
High Wycombe
Stratford-upon-Avon
Moreton-in-Marsh

Browse thousands of different options on Cheapflights for your next trip

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Can Cheapflights find flights from Dulles Intl to Heathrow with no change fees?

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