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Cheap flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from £302

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 1/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
27 Mar — 3 Apr1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Washington, D.C. Dulles Intl are usually found in February or November, booked 68 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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 22 March 2025.

Round-trip from

£426

One-way from

£302

Popular in

August

Cheapest in

February

Average price

£584

Good round-trip deal

£538 or less

Good one-way deal

£628 or less
Lufthansa
  • Lufthansa
  • 23/4-10/5
  • 3 total stops
  • 41h 44m total
  • London to Washington, D.C.
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1/5
  • 1/5
  • 2 total stops
  • 23h 30m total
  • London to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£66 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
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Average for round-trip flights in March 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 22 March 2025.

Sat 26/414:05LHR - IAD
1 stop30h 08mUnited Airlines
Sun 27/422:15IAD - LHR
Nonstop7h 25mUnited Airlines
Deal found 20/3£423
Wed 23/408:40LHR - IAD
1 stop12h 35mLufthansa
Sat 10/522:26IAD - LHR
2 stops29h 09mLufthansa
Deal found 21/3£426
Sat 10/513:05LHR - IAD
1 stop30h 10mBrussels Airlines
Sun 11/517:35IAD - LHR
1 stop35h 05mBrussels Airlines
Deal found 20/3£432
Thu 20/312:15LHR - IAD
1 stop11h 10mIcelandair
Mon 24/320:40IAD - LHR
1 stop18h 50mIcelandair
Deal found 20/3£455
Fri 28/319:30LHR - IAD
1 stop25h 10mScandinavian Airlines
Sun 30/318:50IAD - LHR
1 stop18h 40mScandinavian Airlines
Deal found 20/3£472
Thu 3/406:00LHR - IAD
1 stop13h 35mAustrian Airlines
Wed 30/417:10IAD - LHR
1 stop13h 35mAustrian Airlines
Deal found 19/3£474
Wed 26/306:00LHR - IAD
1 stop13h 30mMultiple Airlines
Wed 2/418:30IAD - LHR
Nonstop7h 25mMultiple Airlines
Deal found 19/3£482
Fri 28/306:30LHR - IAD
1 stop14h 15mVirgin Atlantic
Thu 3/417:50IAD - LHR
Nonstop7h 30mVirgin Atlantic
Deal found 21/3£503
Thu 10/417:00LHR - IAD
Nonstop8h 10mFinnair
Mon 28/414:12IAD - LHR
2 stops15h 03mFinnair
Deal found 20/3£504
Fri 28/308:40LHR - IAD
1 stop12h 05mKLM
Sun 30/317:50IAD - LHR
Nonstop7h 30mKLM
Deal found 20/3£513
Tue 8/417:00LHR - IAD
Nonstop8h 10mAmerican Airlines
Sat 19/414:12IAD - LHR
2 stops15h 03mAmerican Airlines
Deal found 20/3£524
Thu 27/308:55LHR - IAD
2 stops15h 46mAir Canada
Wed 2/416:07IAD - LHR
1 stop9h 23mAir Canada
Deal found 20/3£530

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 22 March 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

Sat 26/4

14:05-15:13

1 stop30h 08m

Washington, D.C. Dulles Intl

Sun 27/4

22:15-10:40

Nonstop7h 25m

£423

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 23/4

08:40-16:15

1 stop12h 35m

Washington, D.C. Dulles Intl

Sat 10/5

22:26-08:35

2 stops29h 09m

£426

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 10/5

13:05-14:15

1 stop30h 10m

Washington, D.C. Dulles Intl

Sun 11/5

17:35-09:40

1 stop35h 05m

£432

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 24/4

13:05-19:20

1 stop11h 15m

Washington, D.C. Dulles Intl

Wed 7/5

20:30-20:20

1 stop18h 50m

£457

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 3/4

06:00-14:35

1 stop13h 35m

Washington, D.C. Dulles Intl

Wed 30/4

17:10-11:45

1 stop13h 35m

£474

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 1/5

10:20-19:59

1 stop14h 39m

Washington, D.C. Dulles Intl

Fri 16/5

22:05-16:00

1 stop12h 55m

£475

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 24/4

08:40-16:15

1 stop12h 35m

Washington, D.C. Dulles Intl

Wed 30/4

18:30-06:55

Nonstop7h 25m

£484

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 10/4

17:00-20:10

Nonstop8h 10m

Washington, D.C. Dulles Intl

Mon 28/4

14:12-10:15

2 stops15h 03m

£504

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 2/5

08:40-15:35

1 stop11h 55m

Washington, D.C. Dulles Intl

Mon 5/5

17:50-06:20

Nonstop7h 30m

£519

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 8/4

17:00-20:10

Nonstop8h 10m

Washington, D.C. Dulles Intl

Sat 19/4

14:12-10:15

2 stops15h 03m

£524

Flights are sorted by cheapest return flights first.

Deals found on 20/3

Showing 1-10 of 22 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 21 March 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 68 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 22 March 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 21% 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 16 March 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.

Weekly flight availability from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Heathrow to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 22 March 2025.

The most flights from LHR to IAD are scheduled on a Wednesday (26 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (22 on average).

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

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 22 March 2025.
Peruse reviews from past customers who have flown with Delta, KLM and Austrian Airlines from London to Washington, D.C. to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,892 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very Good
7,892 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,319 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Austrian Airlines
7.6
Good
768 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,567 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.4
Good
1,422 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

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

    Currently priced at £426, Lufthansa will fly you from London Heathrow Airport to Washington, D.C. Dulles Intl Airport and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and Icelandair - these airlines can fly you to your destination from £427 and £455, respectively. Lufthansa is currently priced 33% below the average price you’ll pay for this route.

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

    One-way options have recently been found by users for as low as £339 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Icelandair from £394 and Aer Lingus from £451 one-way.

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

    Consider KLM (90%), Air France (90%) or Delta (90%) 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 £1,149 for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £465 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £326.

  • 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 Reykjavik most frequently.

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

    Reykjavik travellers tend to visit Hallgrímskirkja, National Cathedral, and Harpa more than anywhere else. Hallgrímskirkja, National Cathedral, and Harpa are located about 23.2 mi, 23.0 mi, and 23.3 mi, respectively from Reykjavik Keflavik Intl. Those on a stopover in Reykjavik in need of a car hire can book one at Reykjavik Keflavik Intl for about £35.

  • 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 Dublin.

  • 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 London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Silver Spring
Arlington
Woodbridge
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 22 March 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 22 March 2025.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest£296Average£485FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
DeltaCheapest£331Average£790FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Brussels AirlinesCheapest£396Average£742FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
IcelandairCheapest£399Average£536FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
TAP AIR PORTUGALCheapest£424Average£608FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesCheapest£455Average£592FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Air FranceCheapest£456Average£635FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£469Average£638FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£483Average£650FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£492Average£631FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus 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 Heathrow to Dulles Intl?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Heathrow to Dulles Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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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