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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 387

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 28/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
30 Mar — 6 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 Wednesday or Thursday and return on a Saturday

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 25 March 2025.

Round-trip from

C$ 842

One-way from

C$ 387

Popular in

June

Cheapest in

September

Average price

C$ 996

Good round-trip deal

C$ 841 or less
Icelandair
  • Icelandair
  • 2/5-9/6
  • 2 total stops
  • 48h 35m total
  • Washington, D.C. to London
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Icelandair
  • Icelandair
  • 28/4
  • 1 total stop
  • 10h 25m total
  • Washington, D.C. to London
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Highest demand for flights based on searches. 16% potential increase in price (C$ 313 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 59 potential savings vs. average RT 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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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 25 March 2025.

Fri 2/58:30 p.m.IAD - LHR
1 stop18h 50mIcelandair
Sun 8/69:25 p.m.LHR - IAD
1 stop26h 55mIcelandair
Deal found 23/3C$ 842
Tue 15/410:05 p.m.IAD - LHR
2 stops18h 30mScandinavian Airlines
Thu 1/57:05 a.m.LHR - IAD
2 stops17h 54mScandinavian Airlines
Deal found 24/3C$ 844
Wed 24/910:40 p.m.IAD - LHR
Nonstop7h 25mIberia
Thu 9/106:15 a.m.LHR - IAD
1 stop13h 45mIberia
Deal found 24/3C$ 862
Sun 7/126:15 p.m.IAD - LHR
Nonstop7h 15mMultiple Airlines
Thu 26/28:20 a.m.LHR - IAD
1 stop13h 10mMultiple Airlines
Deal found 24/3C$ 872
Sun 4/56:30 p.m.IAD - LHR
Nonstop7h 25mUnited Airlines
Tue 13/51:45 p.m.LHR - IAD
1 stop31h 30mUnited Airlines
Deal found 24/3C$ 890
Mon 7/45:40 p.m.IAD - LHR
Nonstop7h 35mFinnair
Tue 15/45:00 p.m.LHR - IAD
Nonstop8h 10mFinnair
Deal found 24/3C$ 897
Wed 16/45:50 p.m.IAD - LHR
Nonstop7h 30mDelta
Tue 22/46:15 a.m.LHR - IAD
1 stop15h 05mDelta
Deal found 24/3C$ 904
Thu 15/55:20 p.m.IAD - LHR
1 stop10h 45mAer Lingus
Thu 22/58:50 a.m.LHR - IAD
1 stop12h 00mAer Lingus
Deal found 23/3C$ 923
Wed 9/45:22 p.m.IAD - LHR
1 stop10h 33mKLM
Thu 17/48:40 a.m.LHR - IAD
1 stop11h 55mKLM
Deal found 24/3C$ 948
Mon 21/45:25 p.m.IAD - LHR
1 stop33h 55mAustrian Airlines
Mon 28/47:30 p.m.LHR - IAD
1 stop24h 05mAustrian Airlines
Deal found 24/3C$ 974
Thu 4/97:25 p.m.IAD - LHR
Nonstop7h 20mBritish Airways
Wed 24/92:25 p.m.LHR - IAD
Nonstop8h 05mBritish Airways
Deal found 23/3C$ 991
Thu 21/810:20 p.m.IAD - LHR
1 stop15h 05mLufthansa
Fri 29/810:50 a.m.LHR - IAD
1 stop13h 35mLufthansa
Deal found 24/3C$ 1,019

Cheapflights Fare Finder

Customize 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 629,999 searches. Data last updated 25 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

Fri 2/5

8:30 p.m.-8:20 p.m.

1 stop18h 50m

London Heathrow

Sun 8/6

9:25 p.m.-7:20 p.m.

1 stop26h 55m

C$ 842

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 15/4

10:05 p.m.-9:35 p.m.

2 stops18h 30m

London Heathrow

Thu 1/5

7:05 a.m.-7:59 p.m.

2 stops17h 54m

C$ 844

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 4/5

6:30 p.m.-6:55 a.m.

Nonstop7h 25m

London Heathrow

Tue 13/5

1:45 p.m.-4:15 p.m.

1 stop31h 30m

C$ 890

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 7/4

5:40 p.m.-6:15 a.m.

Nonstop7h 35m

London Heathrow

Tue 15/4

5:00 p.m.-8:10 p.m.

Nonstop8h 10m

C$ 897

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 16/4

5:50 p.m.-6:20 a.m.

Nonstop7h 30m

London Heathrow

Tue 22/4

6:15 a.m.-4:20 p.m.

1 stop15h 05m

C$ 904

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 15/5

5:20 p.m.-9:05 a.m.

1 stop10h 45m

London Heathrow

Thu 22/5

8:50 a.m.-3:50 p.m.

1 stop12h 00m

C$ 923

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 9/4

5:22 p.m.-8:55 a.m.

1 stop10h 33m

London Heathrow

Thu 17/4

8:40 a.m.-3:35 p.m.

1 stop11h 55m

C$ 948

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 21/4

5:25 p.m.-8:20 a.m.

1 stop33h 55m

London Heathrow

Mon 28/4

7:30 p.m.-2:35 p.m.

1 stop24h 05m

C$ 974

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 2/5

6:30 p.m.-6:55 a.m.

Nonstop7h 25m

London Heathrow

Mon 5/5

12:10 p.m.-4:15 p.m.

1 stop33h 05m

C$ 980

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 4/9

7:25 p.m.-7:45 a.m.

Nonstop7h 20m

London Heathrow

Wed 24/9

2:25 p.m.-5:30 p.m.

Nonstop8h 05m

C$ 991

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/3

Showing 1-10 of 24 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 round-trip 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 round-trip flight from Dulles Intl to Heathrow. Price data was last updated on 21 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 C$ 560). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in July is currently the most expensive (average of C$ 874). 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 25 March 2025.

When flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 25 March 2025.

The most flights from IAD to LHR are scheduled on a Monday (26 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (19 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 mm 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 25 March 2025.
Peruse reviews from past customers who have flown with Delta, KLM and Finnair from Washington, D.C. to London 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
7,890 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Crew

8.5

Comfort

8.0

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
7,890 reviews
Delta
8.0
Very good
7,890 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Crew

8.5

Comfort

8.0

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
1,318 reviews
Delta
8.0
Very good
7,890 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Crew

8.5

Comfort

8.0

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
7,890 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Crew

8.5

Comfort

8.0

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
7.5
Good
769 reviews
Delta
8.0
Very good
7,890 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Crew

8.5

Comfort

8.0

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
1,569 reviews
Delta
8.0
Very good
7,890 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Crew

8.5

Comfort

8.0

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?

    According to our current data, Icelandair (C$ 842), Scandinavian Airlines (C$ 844), and United Airlines (C$ 890) offers the cheapest pricing from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. 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?

    C$ 387 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on TAP AIR PORTUGAL and Scandinavian Airlines, with prices starting from C$ 451 and C$ 530, respectively.

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

    No one likes to see their flight delayed. When booking a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport consider choosing KLM (94%), Delta (94%) or Air France (93%) as they are the most reliable in getting you off to your destination on time.

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

    While on average a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is generally C$ 982, our data shows the cheapest flight currently is C$ 660. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay C$ 1,202 for that flight.

  • 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 vacation 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 C$ 560). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in July is currently the most expensive (average of C$ 874). 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
Brentford
Hounslow
Sutton
Slough
Milton Keynes
Romford
Watford
Luton
Bromley
Bedford
Southall

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Yes, we can. To see specific flights from Dulles Intl to Heathrow with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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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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