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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from £233

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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
21 Dec — 28 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 Wednesday or Tuesday and return on a Wednesday

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 21 November 2025.

Round-trip from

£443

One-way from

£233

Popular in

June

Cheapest in

August

Average price

£552

Good round-trip deal

£485 or less

Good one-way deal

£294 or less
Austrian Airlines
  • Austrian Airlines
  • 11/1-21/1
  • 1 total stop
  • 21h 00m total
  • Washington, D.C. to London
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5/12
  • 5/12
  • 3 total stops
  • 32h 30m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£70 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 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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Price to beat on a one-way 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 21 November 2025.

Tue 30/1221:45IAD - LHR
Nonstop7h 15mBritish Airways
Tue 13/112:10LHR - IAD
Nonstop8h 25mBritish Airways
Deal found 19/11£444
Thu 27/1119:40IAD - LHR
1 stop18h 50mIcelandair
Wed 3/1220:35LHR - IAD
1 stop26h 55mIcelandair
Deal found 20/11£445
Sun 7/1222:30IAD - LHR
1 stop14h 00mTAP AIR PORTUGAL
Tue 23/1218:30LHR - IAD
1 stop31h 30mTAP AIR PORTUGAL
Deal found 19/11£448
Sun 7/1219:40IAD - LHR
1 stop10h 10mIcelandair
Wed 7/120:35LHR - IAD
1 stop26h 55mIcelandair
Deal found 19/11£449
Wed 31/1222:30IAD - LHR
1 stop12h 00mTAP AIR PORTUGAL
Wed 14/106:00LHR - IAD
1 stop20h 00mTAP AIR PORTUGAL
Deal found 19/11£451
Thu 4/1219:40IAD - LHR
1 stop18h 50mIcelandair
Sun 14/1220:35LHR - IAD
1 stop26h 55mIcelandair
Deal found 20/11£451
Tue 9/1219:40IAD - LHR
1 stop18h 50mIcelandair
Fri 9/120:35LHR - IAD
1 stop26h 55mIcelandair
Deal found 19/11£452
Tue 30/1220:30IAD - LHR
1 stop17h 45mSWISS
Sun 11/120:05LHR - IAD
1 stop24h 25mSWISS
Deal found 20/11£454
Thu 4/1219:40IAD - LHR
1 stop18h 50mIcelandair
Tue 16/1220:35LHR - IAD
1 stop26h 55mIcelandair
Deal found 20/11£455
Mon 1/1219:40IAD - LHR
1 stop10h 10mIcelandair
Tue 13/112:15LHR - IAD
1 stop11h 15mIcelandair
Deal found 20/11£456
Wed 3/1222:15IAD - LHR
Nonstop7h 35mAustrian Airlines
Wed 10/1219:25LHR - IAD
1 stop24h 15mAustrian Airlines
Deal found 19/11£457
Thu 27/1119:40IAD - LHR
1 stop18h 50mIcelandair
Tue 2/1220:35LHR - IAD
1 stop26h 55mIcelandair
Deal found 19/11£458

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 21 November 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

Sat 17/1

12:23-09:20

2 stops15h 57m

London Heathrow

Mon 26/1

06:40-19:09

2 stops17h 29m

£458

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 13/2

22:15-10:50

Nonstop7h 35m

London Heathrow

Mon 16/2

06:50-14:35

1 stop12h 45m

£467

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 30/1

22:15-10:50

Nonstop7h 35m

London Heathrow

Fri 6/2

13:45-16:40

1 stop31h 55m

£467

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 23/1

18:05-06:40

Nonstop7h 35m

London Heathrow

Sat 31/1

06:35-15:35

1 stop14h 00m

£467

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 27/1

18:20-06:40

Nonstop7h 20m

London Heathrow

Tue 10/2

06:50-14:35

1 stop12h 45m

£467

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 18/2

22:15-10:50

Nonstop7h 35m

London Heathrow

Thu 26/2

06:50-14:35

1 stop12h 45m

£467

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 17/1

22:20-10:50

Nonstop7h 30m

London Heathrow

Sun 25/1

06:30-16:05

1 stop14h 35m

£468

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 9/1

22:20-10:50

Nonstop7h 30m

London Heathrow

Mon 19/1

10:00-16:05

1 stop11h 05m

£468

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 31/12

22:15-10:50

Nonstop7h 35m

London Heathrow

Wed 14/1

07:30-14:35

1 stop12h 05m

£468

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 7/12

10:08-07:50

2 stops16h 42m

London Heathrow

Tue 16/12

06:30-16:05

1 stop14h 35m

£469

Flights are sorted by cheapest return flights first.

Deals found on 20/11

Showing 1-10 of 24 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 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 14 November 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 £332). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of £572). 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 21 November 2025.

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 21 November 2025.
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
674 reviews
Check prices

Overall

7.5

Entertainment

7.5

Boarding

7.7

Crew

8.2

Food

6.9

Comfort

7.3

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
674 reviews
Virgin Atlantic
7.5
Good
674 reviews
Check prices

Overall

7.5

Entertainment

7.5

Boarding

7.7

Crew

8.2

Food

6.9

Comfort

7.3

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
9,030 reviews
Virgin Atlantic
7.5
Good
674 reviews
Check prices

Overall

7.5

Entertainment

7.5

Boarding

7.7

Crew

8.2

Food

6.9

Comfort

7.3

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
3,028 reviews
Virgin Atlantic
7.5
Good
674 reviews
Check prices

Overall

7.5

Entertainment

7.5

Boarding

7.7

Crew

8.2

Food

6.9

Comfort

7.3

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
7,579 reviews
Virgin Atlantic
7.5
Good
674 reviews
Check prices

Overall

7.5

Entertainment

7.5

Boarding

7.7

Crew

8.2

Food

6.9

Comfort

7.3

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
7,534 reviews
Virgin Atlantic
7.5
Good
674 reviews
Check prices

Overall

7.5

Entertainment

7.5

Boarding

7.7

Crew

8.2

Food

6.9

Comfort

7.3

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 35m. Fly via Scandinavian Airlines or United Airlines 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 £317, 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 £378 and £392, 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 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 (86%), Aer Lingus (82%), American Airlines( 82%).

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

    On average you can expect to pay £466 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is £278 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at £307.

  • 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 £332). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of £572). 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
Croydon
Slough
Gatwick
Hounslow
Northampton
Luton
Ilford
Wembley
Deal
Hayes
Colchester
Watford
Winchester
Swindon
Crawley
Brentford
Romford
Chichester
Ipswich

Browse thousands of different options on Cheapflights for your next trip

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Top 8 airlines flying from Dulles Intl to Heathrow

Discover the top 8 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 21 November 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£317Average£548FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£378Average£562FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£392Average£650FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£396Average£590FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air FranceCheapest£407Average£540FlexibilityNo cancel feeOn-time77%
Search Air France flights
IberiaCheapest£470Average£531FlexibilityNo cancel feeOn-time77%
Search Iberia flights
KLMCheapest£518Average£665FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£537Average£642FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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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.

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