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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from £189

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 22/7. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
15 Apr — 22 Apr1
1 adult

Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in September or October, booked 45 days in advance, depart on a Monday 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 10 April 2025.

Round-trip from

£466

One-way from

£189

Popular in

June

Cheapest in

September

Average price

£556

Good round-trip deal

£516 or less

Good one-way deal

£357 or less
American Airlines
  • American Airlines
  • 20/4-29/4
  • 1 total stop
  • 21h 15m total
  • Washington, D.C. to London
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TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 22/7
  • 1 total stop
  • 15h 30m 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 (£17 potential savings vs. average return price).
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Average for round-trip flights in April 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 10 April 2025.

Sun 20/422:40IAD - LHR
Nonstop7h 25mAmerican Airlines
Tue 29/406:10LHR - IAD
1 stop13h 50mAmerican Airlines
Deal found 9/4£466
Sun 21/922:05IAD - LHR
2 stops18h 30mScandinavian Airlines
Tue 7/1010:20LHR - IAD
1 stop14h 39mScandinavian Airlines
Deal found 9/4£467
Sun 27/415:55IAD - LHR
1 stop13h 05mUnited Airlines
Thu 8/508:40LHR - IAD
1 stop12h 35mUnited Airlines
Deal found 9/4£468
Sun 20/417:50IAD - LHR
Nonstop7h 30mVirgin Atlantic
Tue 29/412:35LHR - IAD
Nonstop8h 25mVirgin Atlantic
Deal found 10/4£468
Wed 14/522:40IAD - LHR
Nonstop7h 25mIberia
Wed 21/517:00LHR - IAD
Nonstop8h 05mIberia
Deal found 9/4£469
Wed 23/417:20IAD - LHR
1 stop9h 40mAer Lingus
Wed 14/512:00LHR - IAD
1 stop12h 30mAer Lingus
Deal found 8/4£475
Wed 23/417:50IAD - LHR
Nonstop7h 30mDelta
Wed 30/406:15LHR - IAD
1 stop15h 05mDelta
Deal found 10/4£475
Tue 22/415:55IAD - LHR
1 stop13h 05mAir Canada
Wed 14/506:50LHR - IAD
2 stops14h 18mAir Canada
Deal found 10/4£478
Wed 16/423:05IAD - LHR
1 stop11h 35mMultiple Airlines
Fri 25/408:40LHR - IAD
1 stop12h 35mMultiple Airlines
Deal found 9/4£479
Thu 1/520:30IAD - LHR
1 stop18h 50mIcelandair
Fri 9/513:05LHR - IAD
1 stop11h 15mIcelandair
Deal found 10/4£483
Wed 23/423:05IAD - LHR
1 stop16h 40mLufthansa
Tue 29/409:00LHR - IAD
1 stop15h 25mLufthansa
Deal found 10/4£487
Tue 22/417:35IAD - LHR
1 stop18h 30mBrussels Airlines
Tue 6/507:45LHR - IAD
1 stop10h 45mBrussels Airlines
Deal found 9/4£508

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 10 April 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

Sun 20/4

22:40-11:05

Nonstop7h 25m

London Heathrow

Thu 8/5

06:15-15:00

1 stop13h 45m

£466

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 20/4

22:14-06:30

1 stop27h 16m

London Heathrow

Tue 29/4

09:30-16:19

1 stop11h 49m

£467

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 27/4

15:55-10:00

1 stop13h 05m

London Heathrow

Thu 8/5

08:40-16:15

1 stop12h 35m

£468

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 20/4

17:50-06:20

Nonstop7h 30m

London Heathrow

Tue 29/4

12:35-16:00

Nonstop8h 25m

£468

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 14/5

22:40-11:05

Nonstop7h 25m

London Heathrow

Wed 21/5

17:00-20:05

Nonstop8h 05m

£469

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 21/9

22:05-21:35

2 stops18h 30m

London Heathrow

Tue 7/10

10:35-19:59

2 stops14h 24m

£470

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 20/4

10:35-06:30

2 stops14h 55m

London Heathrow

Thu 8/5

06:00-14:35

1 stop13h 35m

£472

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 23/4

17:20-08:00

1 stop9h 40m

London Heathrow

Wed 14/5

12:00-19:30

1 stop12h 30m

£475

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 23/4

17:50-06:20

Nonstop7h 30m

London Heathrow

Wed 30/4

06:15-16:20

1 stop15h 05m

£475

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 23/4

20:30-20:20

1 stop18h 50m

London Heathrow

Wed 7/5

21:25-19:20

1 stop26h 55m

£479

Flights are sorted by cheapest return flights first.

Deals found on 8/4

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 4 April 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 10 April 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 3% 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 10 April 2025.

The most flights from IAD to LHR are scheduled on a Monday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 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 10 April 2025.
Get a feel of what it's like to fly with Delta, Austrian Airlines and SWISS 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
7,910 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Food

7.3

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
7,910 reviews
Delta
8.0
Very Good
7,910 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Food

7.3

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.
Austrian Airlines
7.6
Good
774 reviews
Delta
8.0
Very Good
7,910 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Food

7.3

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
1,574 reviews
Delta
8.0
Very Good
7,910 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Food

7.3

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
1,428 reviews
Delta
8.0
Very Good
7,910 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Food

7.3

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.
United Airlines
7.4
Good
8,636 reviews
Delta
8.0
Very Good
7,910 reviews
Check prices

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Food

7.3

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 £466, American Airlines will fly you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and United Airlines - these airlines can fly you to your destination from £467 and £468, respectively. You may be able to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport for 22% 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 TAP AIR PORTUGAL. According to our data, you can fly for as low as £189. Users have also found prices from £190 and £251 on Icelandair and Austrian Airlines, 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: Delta (94%), Singapore Airlines (92%), Virgin Atlantic( 92%).

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

    On average you can expect to pay £1,029 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is £289 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at £380.

  • 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
Luton
Gatwick
Croydon
Slough
Eastbourne
Northampton
Wembley
Crawley
Hayes
Swindon
Southend-on-Sea
Maidstone
Ilford
Winchester
Ipswich
Southall
Folkestone

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 10 April 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£387Average£579FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£445Average£566FlexibilityNo cancel feeOn-time77%
Search Air France flights
Virgin AtlanticCheapest£455Average£672FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£468Average£613FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£485Average£587FlexibilityNo cancel feeOn-time75%
Search KLM flights
IberiaCheapest£489Average£531FlexibilityNo cancel feeOn-time77%
Search Iberia flights
LufthansaCheapest£516Average£769FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£518Average£722FlexibilityNo 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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