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Cheap flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from £379

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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
2 Sep — 9 Sep1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Washington, D.C. Dulles Intl are usually found in February or March, booked 75 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Heathrow to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Dulles Intl (IAD). 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 28 August 2025.

Round-trip from

£419

One-way from

£379

Popular in

July

Cheapest in

February

Average price

£679

Good round-trip deal

£484 or less

Good one-way deal

£595 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 1/10-26/10
  • 2 total stops
  • 38h 30m total
  • London to Washington, D.C.
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10/10
  • 10/10
  • 3 total stops
  • 48h 11m total
  • London to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£59 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from London Heathrow to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from London Heathrow to Washington, D.C. Dulles Intl.
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Find flight deals from Heathrow to Dulles Intl

Cheapest flights from Heathrow to Dulles Intl
Explore the most affordable flight options available from Heathrow to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 August 2025.

Fri 5/913:05LHR - IAD
1 stop11h 15mIcelandair
Mon 15/920:30IAD - LHR
1 stop10h 25mIcelandair
Deal found 27/8£419
Fri 19/907:40LHR - IAD
1 stop13h 10mAer Lingus
Sat 27/917:20IAD - LHR
1 stop9h 40mAer Lingus
Deal found 27/8£420
Fri 3/1008:50LHR - IAD
1 stop12h 00mAer Lingus
Sun 12/1017:20IAD - LHR
1 stop9h 40mAer Lingus
Deal found 26/8£420
Sun 14/910:50LHR - IAD
1 stop33h 10mBritish Airways
Tue 30/919:21IAD - LHR
1 stop12h 09mBritish Airways
Deal found 27/8£421
Fri 5/1216:25LHR - IAD
Nonstop8h 30mBritish Airways
Tue 9/1221:45IAD - LHR
Nonstop7h 15mBritish Airways
Deal found 27/8£422
Sun 9/1121:05LHR - IAD
3 stops26h 25mMultiple Airlines
Thu 13/1119:40IAD - LHR
2 stops20h 40mMultiple Airlines
Deal found 27/8£423
Wed 10/911:00LHR - IAD
1 stop12h 51mBritish Airways
Mon 29/914:21IAD - LHR
1 stop13h 44mBritish Airways
Deal found 27/8£424
Tue 30/909:15LHR - IAD
1 stop14h 36mAmerican Airlines
Mon 20/1017:50IAD - LHR
Nonstop7h 25mAmerican Airlines
Deal found 27/8£425
Sun 7/920:55LHR - IAD
1 stop23h 40mVirgin Atlantic
Thu 18/920:17IAD - LHR
1 stop10h 08mVirgin Atlantic
Deal found 27/8£425
Sat 18/1006:40LHR - IAD
1 stop18h 19mScandinavian Airlines
Wed 22/1022:05IAD - LHR
1 stop12h 55mScandinavian Airlines
Deal found 26/8£426
Sun 7/908:50LHR - IAD
1 stop12h 00mAer Lingus
Thu 18/917:20IAD - LHR
1 stop10h 45mAer Lingus
Deal found 26/8£427
Tue 30/921:25LHR - IAD
1 stop29h 45mIcelandair
Sun 5/1023:15IAD - LHR
1 stop31h 40mIcelandair
Deal found 27/8£428

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Dulles Intl 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 28 August 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Heathrow

Fly to

Dulles Intl

Route

Depart

Return

Price

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 8/9

12:45-16:00

Nonstop8h 15m

Washington, D.C. Dulles Intl

Mon 6/10

17:41-09:05

1 stop10h 24m

£420

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 10/1

06:40-18:50

2 stops17h 10m

Washington, D.C. Dulles Intl

Sat 24/1

20:30-21:40

1 stop20h 10m

£422

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 18/9

06:30-15:35

1 stop14h 05m

Washington, D.C. Dulles Intl

Sun 21/9

17:50-06:20

Nonstop7h 30m

£424

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 8/9

08:40-15:35

1 stop11h 55m

Washington, D.C. Dulles Intl

Mon 22/9

12:08-06:25

1 stop13h 17m

£424

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 1/12

08:40-16:05

1 stop12h 25m

Washington, D.C. Dulles Intl

Tue 9/12

22:20-10:50

Nonstop7h 30m

£424

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 2/12

10:00-16:05

1 stop11h 05m

Washington, D.C. Dulles Intl

Tue 9/12

22:20-10:50

Nonstop7h 30m

£424

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 1/12

06:30-16:05

1 stop14h 35m

Washington, D.C. Dulles Intl

Mon 8/12

22:20-10:50

Nonstop7h 30m

£424

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 3/12

06:30-16:05

1 stop14h 35m

Washington, D.C. Dulles Intl

Tue 9/12

22:20-10:50

Nonstop7h 30m

£424

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 12/9

06:30-15:35

1 stop14h 05m

Washington, D.C. Dulles Intl

Mon 29/9

17:50-06:20

Nonstop7h 30m

£424

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 7/10

06:40-19:59

1 stop18h 19m

Washington, D.C. Dulles Intl

Wed 15/10

22:05-21:20

2 stops18h 15m

£425

Flights are sorted by cheapest return flights first.

Deals found on 27/8

Showing 1-10 of 23 results
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Best time to book a flight from Heathrow to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Heathrow 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 London Heathrow Airport to Washington, D.C. Dulles Intl Airport

How far ahead should I book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the optimal time to book a return flight from Heathrow to Dulles Intl. Price data was last updated on 22 August 2025.

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport, you should look to book at least 75 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £599). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). 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 LHR to IAD?

Find hourly flight availability from Heathrow to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 August 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in the evening. If you’re flexible enough to do this you can expect to save up to 18% on your trip compared to booking a flight in the afternoon.

What is the cheapest day to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the cheapest time to fly return from Heathrow to Dulles Intl. Price data was last updated on 24 August 2025.

Travellers seeking maximum savings on their London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated 28 August 2025.
Read reviews from past customers who have flown with Virgin Atlantic, Aer Lingus, andIcelandair from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.4
Good
661 reviews
Check prices

Boarding

7.7

Food

6.9

Crew

8.1

Entertainment

7.5

Comfort

7.3

Overall

7.4

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
7.4
Good
661 reviews
Virgin Atlantic
7.4
Good
661 reviews
Check prices

Boarding

7.7

Food

6.9

Crew

8.1

Entertainment

7.5

Comfort

7.3

Overall

7.4

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!
Aer Lingus
7.2
Good
1,239 reviews
Virgin Atlantic
7.4
Good
661 reviews
Check prices

Boarding

7.7

Food

6.9

Crew

8.1

Entertainment

7.5

Comfort

7.3

Overall

7.4

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!
Icelandair
7.0
Good
534 reviews
Virgin Atlantic
7.4
Good
661 reviews
Check prices

Boarding

7.7

Food

6.9

Crew

8.1

Entertainment

7.5

Comfort

7.3

Overall

7.4

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
7,368 reviews
Virgin Atlantic
7.4
Good
661 reviews
Check prices

Boarding

7.7

Food

6.9

Crew

8.1

Entertainment

7.5

Comfort

7.3

Overall

7.4

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
7,316 reviews
Virgin Atlantic
7.4
Good
661 reviews
Check prices

Boarding

7.7

Food

6.9

Crew

8.1

Entertainment

7.5

Comfort

7.3

Overall

7.4

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 Heathrow to Dulles Intl. 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 London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

    Airlines like American Airlines, Scandinavian Airlines, and Delta fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in about 8h 15m. The time it takes to get you to your destination can typically vary by up to 8h 55m. There are 3664 mi between London Heathrow Airport and Washington, D.C. Dulles Intl Airport. Both multi-stop and direct flights can be found to your destination and back.

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

    Currently priced at £188, Delta will fly you from London Heathrow Airport to Washington, D.C. Dulles Intl Airport and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from PLAY and TAP AIR PORTUGAL - these airlines can fly you to your destination from £256 and £352, respectively. Delta is currently priced 68% below the average price you’ll pay for this route.

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

    Consider KLM (75%), Air France (75%) or Delta (75%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport.

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

    On average you can expect to pay £1,385 for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £412 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £323.

  • Where are the most common stopover locations when flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

    Flights departing from London Heathrow Airport and landing in Washington, D.C. Dulles Intl Airport stopover in Dublin most frequently.

  • What are some popular things to do or see while on a stopover in Dublin?

    Dublin travellers tend to visit Bord Gáis Energy Theatre, 3Olympia Theatre, and Royal Dublin Society more than anywhere else. Bord Gáis Energy Theatre, 3Olympia Theatre, and Royal Dublin Society are located about 5.7 mi, 5.7 mi, and 6.9 mi, respectively from Dublin. Those on a stopover in Dublin in need of a car hire can book one at Dublin for about £34.

  • Where are the least popular stopover locations for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights?

    Of the flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport that have stopovers, the fewest flights stop in Reykjavik.

  • Can I find deals for flights from Heathrow to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Heathrow to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Dulles Intl.

  • Can I find deals for business class flights from Heathrow to Dulles Intl?

    Yes. Cheapflights offers flight deals from Heathrow to Dulles Intl 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 London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £599). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). 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 Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Hanover
Oxon Hill
Woodbridge
Arlington
College Park
Laurel
Tysons

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Fly from Heathrow to Dulles Intl on these airlines

Choose from the following airlines for your flight from Heathrow to Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on 28 August 2025.
British Airways flights from London Heathrow to Washington, D.C. Dulles Intl
Virgin Atlantic flights from London Heathrow to Washington, D.C. Dulles Intl
Lufthansa flights from London Heathrow to Washington, D.C. Dulles Intl

Top 10 airlines flying from Heathrow to Dulles Intl

Discover the top 10 airlines that operate flights from Heathrow to Dulles Intl. 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 28 August 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£188Average£532FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
PLAYCheapest£256Average£393FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
TAP AIR PORTUGALCheapest£352Average£512FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
IcelandairCheapest£374Average£499FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
FinnairCheapest£437Average£607FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air FranceCheapest£437Average£581FlexibilityNo cancel feeOn-time77%
Search Air France flights
Scandinavian AirlinesCheapest£438Average£574FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
LufthansaCheapest£439Average£608FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£444Average£684FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£447Average£583FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

Fly with Cheapflights

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

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

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 Heathrow to Dulles Intl.

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

Need flexible booking options for your flight to Dulles Intl from Heathrow? 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 Heathrow to Dulles Intl become cheaper?

Yes! Start tracking prices for Heathrow to Dulles Intl flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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