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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from £265

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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
22 Apr — 29 Apr1
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 October, booked 63 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

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 23 March 2026.

Tue 5/522:35
IAD
-
LHR
1 stop19h 20m
TAP AIR PORTUGAL
Tue 19/519:50
LHR
-
IAD
1 stop24h 20m
TAP AIR PORTUGAL
Deal found 18/3£466
Fri 24/417:05
IAD
-
LHR
1 stop12h 15m
TAP AIR PORTUGAL
Wed 29/419:50
LHR
-
IAD
1 stop24h 20m
TAP AIR PORTUGAL
Deal found 18/3£469
Mon 20/422:35
IAD
-
LHR
1 stop18h 25m
TAP AIR PORTUGAL
Wed 29/418:45
LHR
-
IAD
1 stop25h 25m
TAP AIR PORTUGAL
Deal found 22/3£469
Sun 26/420:20
IAD
-
LHR
2 stops37h 15m
Scandinavian Airlines
Wed 29/410:20
LHR
-
IAD
1 stop11h 40m
Scandinavian Airlines
Deal found 20/3£470
Mon 4/522:35
IAD
-
LHR
1 stop30h 45m
TAP AIR PORTUGAL
Tue 19/519:50
LHR
-
IAD
1 stop24h 20m
TAP AIR PORTUGAL
Deal found 18/3£471
Sun 19/422:35
IAD
-
LHR
1 stop18h 25m
TAP AIR PORTUGAL
Mon 4/513:45
LHR
-
IAD
1 stop30h 25m
TAP AIR PORTUGAL
Deal found 21/3£472
Sun 19/422:35
IAD
-
LHR
1 stop33h 10m
TAP AIR PORTUGAL
Thu 30/406:00
LHR
-
IAD
1 stop14h 10m
TAP AIR PORTUGAL
Deal found 21/3£472
Mon 4/522:35
IAD
-
LHR
1 stop19h 20m
TAP AIR PORTUGAL
Wed 13/506:00
LHR
-
IAD
1 stop14h 10m
TAP AIR PORTUGAL
Deal found 18/3£473
Thu 16/422:35
IAD
-
LHR
1 stop15h 15m
TAP AIR PORTUGAL
Thu 23/419:50
LHR
-
IAD
1 stop24h 20m
TAP AIR PORTUGAL
Deal found 19/3£474
Mon 20/422:35
IAD
-
LHR
1 stop15h 15m
TAP AIR PORTUGAL
Thu 30/413:45
LHR
-
IAD
1 stop30h 25m
TAP AIR PORTUGAL
Deal found 19/3£475
Thu 1/1020:20
IAD
-
LHR
2 stops32h 15m
Scandinavian Airlines
Sun 4/1006:40
LHR
-
IAD
2 stops15h 20m
Scandinavian Airlines
Deal found 18/3£475
Mon 11/522:35
IAD
-
LHR
1 stop18h 25m
TAP AIR PORTUGAL
Tue 19/519:50
LHR
-
IAD
1 stop24h 20m
TAP AIR PORTUGAL
Deal found 18/3£476

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 23 March 2026.

Round-trip from

£466

One-way from

£265

Popular in

June

Cheapest in

August

Average price

£606

Good round-trip deal

£610 or less

Good one-way deal

£295 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 4/5-20/5
  • 2 total stops
  • 33h 30m total
  • Washington, D.C. to London
Search Deals
8/4
  • 8/4
  • 2 total stops
  • 19h 50m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£66 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London Heathrow.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
Customise 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 858,174 searches. Data last updated 23 March 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 return flight

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 1/5

22:50-22:00

1 stop18h 10m

London Heathrow

Thu 7/5

06:00-15:10

1 stop14h 10m

£513

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 12/8

18:30-06:55

Nonstop7h 25m

London Heathrow

Fri 21/8

06:50-13:30

1 stop11h 40m

£599

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 12/8

18:30-06:55

Nonstop7h 25m

London Heathrow

Tue 25/8

06:50-14:20

1 stop12h 30m

£599

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 25/4

18:50-20:10

1 stop20h 20m

London Heathrow

Thu 7/5

17:55-20:55

Nonstop8h 00m

£624

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 1/5

21:50-10:40

Nonstop7h 50m

London Heathrow

Thu 7/5

06:50-13:30

1 stop11h 40m

£636

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 21/4

12:45-14:35

2 stops20h 50m

London Heathrow

Sun 3/5

06:40-17:00

2 stops15h 20m

£647

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 4/4

20:16-20:10

1 stop18h 54m

London Heathrow

Sun 12/4

06:30-16:49

2 stops15h 19m

£648
Fastest return journey

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 9/9

22:55-11:20

Nonstop7h 25m

London Heathrow

Sun 13/9

17:55-20:55

Nonstop8h 00m

£658

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 8/5

22:55-11:20

Nonstop7h 25m

London Heathrow

Fri 22/5

08:40-15:35

1 stop11h 55m

£675

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 27/7

08:18-06:30

1 stop17h 12m

London Heathrow

Sat 15/8

16:40-20:00

Nonstop8h 20m

£694

Flights are sorted by cheapest return flights first.

Deals found on 22/3

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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 return 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 return flight from Dulles Intl to Heathrow. Price data was last updated on 13 March 2026.

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 63 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 £327). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of £544). 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 23 March 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport as you normally would.

How much does it cost for a return flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 23 March 2026.
Check out reviews from past customers who have flown with Virgin Atlantic,United Airlines, andIberia from Washington, D.C. Dulles Intl Airport to London Heathrow Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Overall

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Virgin Atlantic
7.5
Good
685 reviews
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Overall

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
United Airlines
7.4
Good
9,467 reviews
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Overall

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Iberia
7.0
Good
3,150 reviews
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Overall

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Lufthansa
6.8
Okay
7,863 reviews
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Overall

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
British Airways
6.7
Okay
7,812 reviews
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Entertainment

7.5

Food

6.9

Crew

8.1

Overall

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

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 25m. Fly via TAP AIR PORTUGAL, United Airlines, or Delta to get the fastest option. Airlines will cover a distance of 3664 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport round-trip?

    Currently priced at £311, Lufthansa will fly you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Icelandair and Virgin Atlantic - these airlines can fly you to your destination from £370 and £380, respectively. You may be able to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport for 45% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport one-way?

    For one-way options, check prices for TAP AIR PORTUGAL. According to our data, you can fly for as low as £160. Users have also found prices from £263 and £268 on Virgin Atlantic and British Airways, respectively.

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

    Before booking your flight to London Heathrow Airport from Washington, D.C. Dulles Intl Airport, check out the most reliable airlines to get you to your destination on time: KLM (90%), Air France (90%), Delta( 90%).

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

    On average you can expect to pay £511 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is £271 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at £469.

  • 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 holiday 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 £327). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of £544). 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
Milton Keynes
Wembley
Croydon
Northampton
Luton
Hounslow
Slough
Gatwick
Ilford
Hayes
Brentford
Colchester
Guildford
Watford
Kingston upon Thames
Eastbourne
Romford
Ipswich
Swindon
Bedford

Browse thousands of different options on Cheapflights for your next trip

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Top 7 airlines flying from Dulles Intl to Heathrow

Discover the top 7 airlines that operate flights from Dulles Intl to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 23 March 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£311Average£431FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£370Average£569FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£380Average£573FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£392Average£577FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air FranceCheapest£399Average£554FlexibilityNo cancel feeOn-time77%
Search Air France flights
IberiaCheapest£459Average£595FlexibilityNo cancel feeOn-time77%
Search Iberia flights
United AirlinesCheapest£493Average£576FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Dulles Intl to Heathrow?

Deals for Dulles Intl to Heathrow flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Heathrow?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Dulles Intl to Heathrow.

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

Need flexible booking options for your flight to Heathrow from Dulles Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Dulles Intl to Heathrow become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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