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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from £190

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 30/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
25 Mar — 1 Apr1
1 adult

Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in September or January, booked 45 days in advance, depart on a Tuesday or Monday 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 20 March 2025.

Round-trip from

£451

One-way from

£190

Popular in

June

Cheapest in

September

Average price

£534

Good round-trip deal

£498 or less

Good one-way deal

£336 or less
Icelandair
  • Icelandair
  • 1/9-8/9
  • 2 total stops
  • 21h 40m total
  • Washington, D.C. to London
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Icelandair
  • Icelandair
  • 30/4
  • 1 total stop
  • 18h 50m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£92 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£18 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 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

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 20 March 2025.

Mon 1/920:30IAD - LHR
1 stop10h 25mIcelandair
Mon 8/913:05LHR - IAD
1 stop11h 15mIcelandair
Deal found 19/3£451
Sun 30/322:20IAD - LHR
1 stop19h 35mTAP AIR PORTUGAL
Tue 1/419:50LHR - IAD
1 stop30h 00mTAP AIR PORTUGAL
Deal found 20/3£453
Wed 23/422:40IAD - LHR
Nonstop7h 25mIberia
Tue 6/517:00LHR - IAD
Nonstop8h 05mIberia
Deal found 20/3£454
Tue 15/422:05IAD - LHR
2 stops13h 20mScandinavian Airlines
Thu 1/510:20LHR - IAD
1 stop14h 39mScandinavian Airlines
Deal found 19/3£454
Sun 6/415:55IAD - LHR
1 stop9h 35mMultiple Airlines
Tue 15/406:00LHR - IAD
1 stop15h 15mMultiple Airlines
Deal found 19/3£460
Sun 6/417:50IAD - LHR
Nonstop7h 30mVirgin Atlantic
Tue 15/406:15LHR - IAD
1 stop15h 05mVirgin Atlantic
Deal found 19/3£471
Sun 6/415:55IAD - LHR
1 stop13h 05mAir Canada
Tue 15/409:30LHR - IAD
1 stop10h 43mAir Canada
Deal found 19/3£474
Wed 2/422:15IAD - LHR
Nonstop7h 25mUnited Airlines
Wed 9/408:40LHR - IAD
1 stop12h 35mUnited Airlines
Deal found 19/3£477
Wed 2/417:50IAD - LHR
Nonstop7h 30mDelta
Thu 10/408:40LHR - IAD
1 stop11h 55mDelta
Deal found 20/3£487
Tue 8/420:45IAD - LHR
1 stop14h 40mSWISS
Tue 22/418:40LHR - IAD
1 stop26h 35mSWISS
Deal found 20/3£492
Sun 13/420:25IAD - LHR
1 stop9h 45mAer Lingus
Sun 15/609:50LHR - IAD
1 stop11h 00mAer Lingus
Deal found 19/3£494
Mon 7/422:40IAD - LHR
Nonstop7h 25mBritish Airways
Tue 15/412:45LHR - IAD
Nonstop8h 05mBritish Airways
Deal found 19/3£514

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 20 March 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

Mon 1/9

20:30-11:55

1 stop10h 25m

London Heathrow

Mon 8/9

13:05-19:20

1 stop11h 15m

£451

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 30/3

22:20-22:55

1 stop19h 35m

London Heathrow

Tue 1/4

19:50-20:50

1 stop30h 00m

£453

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 22/4

22:40-11:05

Nonstop7h 25m

London Heathrow

Tue 29/4

17:00-20:10

Nonstop8h 10m

£454

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 15/4

22:05-16:25

2 stops13h 20m

London Heathrow

Thu 1/5

10:20-19:59

1 stop14h 39m

£454

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 6/4

15:55-06:30

1 stop9h 35m

London Heathrow

Tue 15/4

06:00-16:15

1 stop15h 15m

£460

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 6/4

17:50-06:20

Nonstop7h 30m

London Heathrow

Tue 15/4

08:40-15:35

1 stop11h 55m

£471

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 6/4

15:55-10:00

1 stop13h 05m

London Heathrow

Tue 15/4

09:30-15:13

1 stop10h 43m

£474

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 2/4

22:15-10:40

Nonstop7h 25m

London Heathrow

Wed 9/4

08:40-16:15

1 stop12h 35m

£477

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 23/4

17:50-06:20

Nonstop7h 30m

London Heathrow

Tue 29/4

09:00-16:20

1 stop12h 20m

£486

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 13/4

20:25-12:40

1 stop11h 15m

London Heathrow

Mon 16/6

12:00-18:55

1 stop11h 55m

£494

Flights are sorted by cheapest return flights first.

Deals found on 19/3

Showing 1-10 of 28 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 March 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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of £112). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in August is currently the most expensive (average of £164). 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 20 March 2025.

When flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight at midday, which can drop the price by up to 4% versus a flight in the morning.

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

Explore weekly flight availability from Dulles Intl to Heathrow. 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 20 March 2025.

The most flights from IAD to LHR are scheduled on a Thursday (28 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (12 on average).

Rainfall in Heathrow by month

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

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Temperature in Heathrow by month

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

If weather is an important factor for your trip to London Heathrow 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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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 20 March 2025.
Get a feel of what it's like to fly with Delta, KLM and Finnair from Washington, D.C. to London by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,896 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very Good
7,896 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,319 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,266 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,567 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.4
Good
1,422 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

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

    Currently priced at £451, Icelandair will fly you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from TAP AIR PORTUGAL and Iberia - these airlines can fly you to your destination from £453 and £454, respectively. You may be able to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport for 24% 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 Icelandair. According to our data, you can fly for as low as £190. Users have also found prices from £196 and £269 on TAP AIR PORTUGAL and Virgin Atlantic, 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 (94%), Delta (94%), Air France( 93%).

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

    On average you can expect to pay £461 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is £286 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at £253.

  • 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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of £112). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in August is currently the most expensive (average of £164). 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
Hounslow
Deal
Milton Keynes
Gatwick
Croydon
Slough
Luton
Eastbourne
Northampton
Ilford
Swindon
Hayes
Crawley
Southend-on-Sea
Wembley
Maidstone
Winchester
Ipswich
Watford
Southall

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 20 March 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£386Average£561FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£439Average£554FlexibilityNo cancel feeOn-time77%
Search Air France flights
Virgin AtlanticCheapest£449Average£661FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£462Average£613FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£475Average£612FlexibilityNo cancel feeOn-time75%
Search KLM flights
IberiaCheapest£479Average£534FlexibilityNo cancel feeOn-time77%
Search Iberia flights
LufthansaCheapest£509Average£759FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£511Average£724FlexibilityNo 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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