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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 491

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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
26 Nov — 3 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 August or September, booked 45 days in advance, depart on a Thursday or Saturday and return on a Tuesday

Cheap 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 27 October 2025.

Round-trip from

C$ 791

One-way from

C$ 491

Popular in

June

Cheapest in

August

Average price

C$ 960

Good round-trip deal

C$ 1,324 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 15/4-21/4
  • 4 total stops
  • 42h 05m total
  • Washington, D.C. to London
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TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 11/1
  • 1 total stop
  • 14h 00m total
  • Washington, D.C. to London
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Highest demand for flights based on searches. 14% potential increase in price (C$ 243 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 47 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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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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Find 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 27 October 2025.

Mon 17/1112:11 p.m.IAD - LHR
2 stops22h 49mScandinavian Airlines
Sat 22/1110:20 a.m.LHR - IAD
1 stop13h 30mScandinavian Airlines
Deal found 25/10C$ 799
Mon 3/1110:20 p.m.IAD - LHR
Nonstop7h 30mDelta
Tue 11/116:20 a.m.LHR - IAD
1 stop15h 15mDelta
Deal found 27/10C$ 807
Mon 17/1110:20 p.m.IAD - LHR
Nonstop7h 30mDelta
Fri 28/118:40 a.m.LHR - IAD
1 stop12h 25mDelta
Deal found 27/10C$ 809
Mon 27/107:59 p.m.IAD - LHR
1 stop10h 16mMultiple Airlines
Tue 4/118:55 a.m.LHR - IAD
1 stop12h 40mMultiple Airlines
Deal found 26/10C$ 810
Mon 27/107:35 p.m.IAD - LHR
1 stop12h 05mDelta
Tue 4/1110:00 a.m.LHR - IAD
1 stop11h 05mDelta
Deal found 26/10C$ 812
Sun 16/1110:20 p.m.IAD - LHR
Nonstop7h 30mDelta
Tue 9/1210:00 a.m.LHR - IAD
1 stop11h 05mDelta
Deal found 26/10C$ 813
Wed 29/101:00 p.m.IAD - LHR
1 stop15h 45mVirgin Atlantic
Wed 5/119:00 a.m.LHR - IAD
1 stop12h 35mVirgin Atlantic
Deal found 27/10C$ 814
Wed 5/113:33 p.m.IAD - LHR
1 stop12h 27mDelta
Mon 10/1111:45 a.m.LHR - IAD
1 stop33h 20mDelta
Deal found 27/10C$ 816
Mon 3/1110:20 p.m.IAD - LHR
Nonstop7h 30mVirgin Atlantic
Tue 11/114:50 p.m.LHR - IAD
Nonstop8h 40mVirgin Atlantic
Deal found 27/10C$ 819
Mon 10/1110:20 p.m.IAD - LHR
Nonstop7h 30mDelta
Fri 6/28:55 a.m.LHR - IAD
1 stop12h 40mDelta
Deal found 27/10C$ 821

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 27 October 2025.
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

Dulles Intl

Fly to

Heathrow

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 15/2

12:30 p.m.-5:40 p.m.

2 stops24h 10m

London Heathrow

Sat 21/2

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

2 stops17h 10m

C$ 805

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 2/12

10:20 p.m.-10:50 a.m.

Nonstop7h 30m

London Heathrow

Wed 10/12

9:00 a.m.-4:35 p.m.

1 stop12h 35m

C$ 807

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 12/11

10:20 p.m.-10:50 a.m.

Nonstop7h 30m

London Heathrow

Wed 19/11

9:00 a.m.-4:35 p.m.

1 stop12h 35m

C$ 807

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 16/11

10:20 p.m.-10:50 a.m.

Nonstop7h 30m

London Heathrow

Thu 11/12

10:00 a.m.-4:05 p.m.

1 stop11h 05m

C$ 813

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 17/11

10:20 p.m.-10:50 a.m.

Nonstop7h 30m

London Heathrow

Thu 11/12

10:00 a.m.-4:05 p.m.

1 stop11h 05m

C$ 813

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 18/11

10:20 p.m.-10:50 a.m.

Nonstop7h 30m

London Heathrow

Fri 12/12

4:50 p.m.-8:30 p.m.

Nonstop8h 40m

C$ 819

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 23/1

12:30 p.m.-9:20 a.m.

2 stops15h 50m

London Heathrow

Fri 15/5

6:40 a.m.-4:50 p.m.

2 stops15h 10m

C$ 831

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 29/12

10:20 p.m.-10:50 a.m.

Nonstop7h 30m

London Heathrow

Fri 9/1

8:55 a.m.-6:42 p.m.

1 stop14h 47m

C$ 833

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 26/11

6:03 a.m.-7:05 a.m.

1 stop20h 02m

London Heathrow

Tue 2/12

5:35 p.m.-4:35 p.m.

1 stop28h 00m

C$ 833

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 15/3

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

Nonstop7h 20m

London Heathrow

Mon 30/3

7:10 p.m.-7:25 p.m.

1 stop29h 15m

C$ 858

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

Showing 1-10 of 22 results
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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?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Heathrow. Price data was last updated on 24 October 2025.

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 45 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, August 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$ 606). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,047). 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 27 October 2025.

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?

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 7h 30m. Fly via Scandinavian 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 American Airlines (86%), British Airways (86%) or Aer Lingus (84%) 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$ 1,324, our data shows the cheapest flight currently is C$ 1,098. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay C$ 1,395 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, August 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$ 606). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,047). 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
Sutton
Hounslow
Slough
Marlow
Leamington Spa
Milton Keynes
Romford
Watford
Bedford
Luton
Stratford-upon-Avon
Southall
Gatwick

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