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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 388

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 18/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
5 Sep — 12 Sep1
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 November, booked 63 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
Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 August 2026.

Fri 6/1110:30 p.m. -
1 stop18h 05m
Wed 11/116:00 a.m. -
1 stop19h 35m
Deal found 3/8C$ 882
Thu 17/98:20 p.m. -
1 stop32h 00m
Sun 20/96:40 a.m. -
2 stops39h 20m
Deal found 2/8C$ 900
Fri 30/1011:30 p.m. -
1 stop18h 05m
Wed 4/116:30 p.m. -
1 stop25h 45m
Deal found 4/8C$ 907
Sat 3/1010:35 p.m. -
1 stop30h 45m
Wed 14/1011:20 a.m. -
1 stop14h 15m
Deal found 3/8C$ 916
Sat 26/910:35 p.m. -
1 stop30h 45m
Wed 7/107:50 p.m. -
1 stop24h 20m
Deal found 4/8C$ 918
Thu 24/98:20 p.m. -
1 stop32h 00m
Sun 27/96:40 a.m. -
2 stops39h 20m
Deal found 2/8C$ 942
Wed 4/117:40 p.m. -
1 stop18h 50m
Fri 13/1112:15 p.m. -
1 stop11h 15m
Deal found 5/8C$ 969
Fri 2/108:30 p.m. -
1 stop18h 50m
Sun 11/101:05 p.m. -
1 stop14h 10m
Deal found 4/8C$ 970
Fri 2/108:30 p.m. -
1 stop18h 50m
Mon 12/109:25 p.m. -
1 stop26h 55m
Deal found 5/8C$ 972

Find flight deals from Dulles Intl to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 6 August 2026.

Round-trip from

C$ 882

One-way from

C$ 388

Popular in

June

Cheapest in

February

Average price

C$ 1,246

Good round-trip deal

C$ 2,941 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 6/11-11/11
  • 2 total stops
  • 37h 40m total
  • Washington, D.C. to London
Search Deals
Icelandair
  • Icelandair
  • 18/9
  • 1 total stop
  • 16h 00m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (C$ 498 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 81 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Heathrow 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, Cheapflights users made 629,999 searches. Data last updated 6 August 2026.
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 21/1

8:30 p.m.-4:00 p.m.

1 stop14h 30m

London Heathrow

Wed 27/1

7:30 p.m.-5:15 p.m.

1 stop26h 45m

C$ 1,094
Quickest round-trip

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Tue 10/11

9:45 p.m.-10:00 a.m.

Nonstop7h 15m

London Heathrow

Tue 27/4

12:35 p.m.-3:50 p.m.

Nonstop8h 15m

C$ 1,244

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Sat 31/10

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

Nonstop7h 20m

London Heathrow

Thu 19/11

6:50 a.m.-2:30 p.m.

1 stop12h 40m

C$ 1,264

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Fri 6/11

6:10 a.m.-8:35 p.m.

1 stop9h 25m

London Heathrow

Wed 11/11

9:30 a.m.-3:55 p.m.

1 stop11h 25m

C$ 1,281

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Tue 15/9

10:05 p.m.-10:40 a.m.

Nonstop7h 35m

London Heathrow

Tue 22/9

6:50 a.m.-2:20 p.m.

1 stop12h 30m

C$ 1,293

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Thu 15/10

10:05 p.m.-10:40 a.m.

Nonstop7h 35m

London Heathrow

Fri 23/10

12:15 p.m.-3:30 p.m.

Nonstop8h 15m

C$ 1,305

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Tue 15/9

6:35 p.m.-6:55 a.m.

Nonstop7h 20m

London Heathrow

Mon 5/10

4:25 p.m.-7:25 p.m.

1 stop32h 00m

C$ 1,309

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Wed 30/9

10:15 a.m.-6:25 a.m.

1 stop15h 10m

London Heathrow

Sun 11/10

3:50 p.m.-7:15 p.m.

Nonstop8h 25m

C$ 1,312

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Sat 22/8

12:29 p.m.-9:35 a.m.

2 stops16h 06m

London Heathrow

Mon 31/8

6:40 a.m.-5:00 p.m.

1 stop15h 20m

C$ 1,374

Washington, D.C.London

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

IADLHR

Washington, D.C. Dulles Intl

Fri 13/11

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

Nonstop7h 20m

London Heathrow

Sat 21/11

4:20 p.m.-8:15 p.m.

Nonstop8h 55m

C$ 1,378

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/8

Showing 1-10 of 23 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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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 62 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$ 972). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,829). 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?

Find hourly flight availability from Dulles Intl to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 6 August 2026.

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$ 1,004 and C$ 1,506 in November.
The cheapest round-trip price found within the last 5 days was C$ 882 on TAP AIR PORTUGAL (6 Nov-11 Nov).

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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 11h 50m. Fly via Scandinavian Airlines or United Airlines 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 Finnair (79%), KLM (71%) or Air France (71%) 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$ 2,941, our data shows the cheapest flight currently is C$ 2,941. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay C$ 1,358 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$ 972). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,829). 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
Northampton
Watford
High Wycombe
Stratford-upon-Avon
Moreton-in-Marsh

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

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