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Cheap flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from £323

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 19/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
4 May — 11 May1
1 adult

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

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 29 April 2025.

Round-trip from

£472

One-way from

£323

Popular in

August

Cheapest in

February

Average price

£574

Good round-trip deal

£524 or less

Good one-way deal

£611 or less
Icelandair
  • Icelandair
  • 9/5-12/5
  • 2 total stops
  • 21h 40m total
  • London to Washington, D.C.
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19/5
  • 19/5
  • 2 total stops
  • 23h 30m total
  • London to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£69 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 29 April 2025.

Fri 9/513:05LHR - IAD
1 stop11h 15mIcelandair
Mon 12/520:30IAD - LHR
1 stop10h 25mIcelandair
Deal found 28/4£472
Fri 5/906:40LHR - IAD
1 stop18h 19mScandinavian Airlines
Thu 25/922:05IAD - LHR
1 stop12h 55mScandinavian Airlines
Deal found 28/4£473
Thu 22/507:30LHR - IAD
1 stop12h 45mLufthansa
Sat 31/522:11IAD - LHR
1 stop30h 24mLufthansa
Deal found 28/4£475
Tue 13/508:45LHR - IAD
1 stop12h 30mMultiple Airlines
Fri 23/509:45IAD - LHR
1 stop15h 45mMultiple Airlines
Deal found 28/4£507
Tue 16/920:55LHR - IAD
1 stop23h 40mVirgin Atlantic
Sun 21/917:50IAD - LHR
Nonstop7h 30mVirgin Atlantic
Deal found 28/4£517
Wed 14/506:50LHR - IAD
2 stops14h 18mAir Canada
Sun 18/514:25IAD - LHR
1 stop13h 10mAir Canada
Deal found 28/4£528
Fri 5/908:40LHR - IAD
1 stop12h 35mUnited Airlines
Mon 22/918:40IAD - LHR
Nonstop7h 15mUnited Airlines
Deal found 28/4£530
Fri 5/906:00LHR - IAD
1 stop13h 35mAustrian Airlines
Sun 28/918:40IAD - LHR
Nonstop7h 15mAustrian Airlines
Deal found 28/4£531
Mon 5/518:45LHR - IAD
1 stop25h 35mTAP AIR PORTUGAL
Thu 8/522:20IAD - LHR
1 stop14h 25mTAP AIR PORTUGAL
Deal found 28/4£543
Sun 7/912:35LHR - IAD
Nonstop8h 25mDelta
Wed 24/917:50IAD - LHR
Nonstop7h 30mDelta
Deal found 28/4£557
Thu 8/517:00LHR - IAD
Nonstop8h 05mBritish Airways
Thu 15/522:40IAD - LHR
Nonstop7h 25mBritish Airways
Deal found 28/4£558
Mon 12/506:00LHR - IAD
1 stop15h 15mSWISS
Mon 19/517:20IAD - LHR
2 stops18h 05mSWISS
Deal found 28/4£558

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 29 April 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

Fri 9/5

13:05-19:20

1 stop11h 15m

Washington, D.C. Dulles Intl

Mon 12/5

20:30-11:55

1 stop10h 25m

£472

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 5/9

06:40-19:59

1 stop18h 19m

Washington, D.C. Dulles Intl

Thu 25/9

22:05-16:00

1 stop12h 55m

£473

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 22/5

07:30-15:15

1 stop12h 45m

Washington, D.C. Dulles Intl

Sat 31/5

22:11-09:35

1 stop30h 24m

£475

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 13/5

08:45-16:15

1 stop12h 30m

Washington, D.C. Dulles Intl

Fri 23/5

09:45-06:30

1 stop15h 45m

£507

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 16/9

20:55-15:35

1 stop23h 40m

Washington, D.C. Dulles Intl

Sun 21/9

17:50-06:20

Nonstop7h 30m

£517

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 8/5

06:50-16:19

2 stops14h 29m

Washington, D.C. Dulles Intl

Sun 18/5

09:45-06:30

1 stop15h 45m

£522

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 5/9

08:40-16:15

1 stop12h 35m

Washington, D.C. Dulles Intl

Mon 22/9

18:40-06:55

Nonstop7h 15m

£530

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 5/9

06:00-14:35

1 stop13h 35m

Washington, D.C. Dulles Intl

Sun 28/9

18:40-06:55

Nonstop7h 15m

£531

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 9/5

12:35-16:00

Nonstop8h 25m

Washington, D.C. Dulles Intl

Mon 12/5

17:50-06:20

Nonstop7h 30m

£533

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 8/5

07:40-15:50

1 stop13h 10m

Washington, D.C. Dulles Intl

Thu 15/5

22:40-11:05

Nonstop7h 25m

£543

Flights are sorted by cheapest return flights first.

Deals found on 28/4

Showing 1-10 of 28 results
1
2
3

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 25 April 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 29 April 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 30 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 29 April 2025.

The most flights from LHR to IAD are scheduled on a Friday (31 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 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 29 April 2025.
Peruse reviews from past customers who have flown with Delta, KLM and Finnair 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
7,929 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
7,929 reviews
Delta
8.0
Very Good
7,929 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
1,333 reviews
Delta
8.0
Very Good
7,929 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
Finnair
7.6
Good
1,273 reviews
Delta
8.0
Very Good
7,929 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
780 reviews
Delta
8.0
Very Good
7,929 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
1,588 reviews
Delta
8.0
Very Good
7,929 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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 £472, Icelandair will fly you from London Heathrow Airport to Washington, D.C. Dulles Intl Airport and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Scandinavian Airlines and Lufthansa - these airlines can fly you to your destination from £473 and £475, respectively. Icelandair is currently priced 23% 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 £333 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Aer Lingus from £437 and Scandinavian Airlines from £468 one-way.

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

    Consider United Airlines (92%), Air Canada (90%) or Austrian Airlines (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 £1,227 for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £349 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £423.

  • 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 Button Factory more than anywhere else. Bord Gáis Energy Theatre, 3Olympia Theatre, and Button Factory are located about 5.7 mi, 5.7 mi, and 5.7 mi, respectively from Dublin. Those on a stopover in Dublin in need of a car hire can book one at Dublin for about £22.

  • 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 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 29 April 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 29 April 2025.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest£286Average£479FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
DeltaCheapest£320Average£765FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Brussels AirlinesCheapest£383Average£718FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
IcelandairCheapest£384Average£518FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
TAP AIR PORTUGALCheapest£393Average£561FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesCheapest£440Average£584FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Air FranceCheapest£442Average£616FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£451Average£615FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£468Average£621FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£469Average£670FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

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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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