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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 382

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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
25 Feb — 4 Mar1
1 adult

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 Wednesday or Tuesday and return on a Sunday

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 February 2025.

Round-trip from

C$ 821

One-way from

C$ 382

Popular in

June

Cheapest in

September

Average price

C$ 984

Good round-trip deal

C$ 1,141 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 3/3-13/3
  • 3 total stops
  • 30h 25m total
  • Washington, D.C. to London
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Icelandair
  • Icelandair
  • 7/4
  • 1 total stop
  • 10h 25m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (C$ 335 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).
Search Deals
Average for round-trip flights in February 2025
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London Heathrow.
Search Deals

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 February 2025.

Fri 28/36:50 p.m.IAD - LHR
1 stop11h 15mUnited Airlines
Sun 30/38:30 a.m.LHR - IAD
1 stop11h 30mUnited Airlines
Deal found 20/2C$ 791
Wed 24/910:40 p.m.IAD - LHR
Nonstop7h 25mIberia
Thu 9/106:15 a.m.LHR - IAD
1 stop13h 45mIberia
Deal found 20/2C$ 815
Mon 3/35:10 p.m.IAD - LHR
2 stops16h 25mScandinavian Airlines
Thu 13/36:40 a.m.LHR - IAD
1 stop14h 00mScandinavian Airlines
Deal found 19/2C$ 821
Mon 3/37:40 p.m.IAD - LHR
1 stop10h 10mIcelandair
Thu 20/312:15 p.m.LHR - IAD
1 stop11h 10mIcelandair
Deal found 20/2C$ 841
Tue 11/37:25 p.m.IAD - LHR
Nonstop7h 30mVirgin Atlantic
Tue 18/38:40 a.m.LHR - IAD
1 stop12h 05mVirgin Atlantic
Deal found 20/2C$ 878
Sun 9/310:55 p.m.IAD - LHR
Nonstop7h 10mFinnair
Tue 18/34:30 p.m.LHR - IAD
Nonstop8h 15mFinnair
Deal found 20/2C$ 881
Sun 9/312:15 p.m.IAD - LHR
1 stop14h 10mDelta
Tue 18/39:00 a.m.LHR - IAD
1 stop12h 25mDelta
Deal found 20/2C$ 882
Sat 15/37:00 p.m.IAD - LHR
1 stop14h 05mAustrian Airlines
Sat 22/39:05 a.m.LHR - IAD
1 stop34h 30mAustrian Airlines
Deal found 20/2C$ 912
Thu 20/39:45 p.m.IAD - LHR
1 stop19h 55mSWISS
Mon 31/36:40 p.m.LHR - IAD
1 stop26h 35mSWISS
Deal found 20/2C$ 939
Wed 26/311:20 p.m.IAD - LHR
1 stop12h 30mLufthansa
Sun 6/47:30 a.m.LHR - IAD
1 stop13h 20mLufthansa
Deal found 20/2C$ 953
Wed 12/31:35 p.m.IAD - LHR
2 stops14h 20mAir France
Mon 17/311:30 a.m.LHR - IAD
1 stop12h 35mAir France
Deal found 20/2C$ 970
Sat 8/38:45 p.m.IAD - LHR
1 stop11h 40mAer Lingus
Wed 12/312:10 p.m.LHR - IAD
1 stop12h 35mAer Lingus
Deal found 20/2C$ 977

Find flights from Dulles Intl to Heathrow within your budget

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 20 February 2025.

Fly from

Dulles Intl

Fly to

Heathrow

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 28/3

6:50 p.m.-10:05 a.m.

1 stop11h 15m

London Heathrow

Sun 30/3

8:30 a.m.-3:00 p.m.

1 stop11h 30m

C$ 791

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 3/3

5:10 p.m.-2:35 p.m.

2 stops16h 25m

London Heathrow

Thu 13/3

6:40 a.m.-4:40 p.m.

1 stop14h 00m

C$ 821

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 3/3

7:40 p.m.-10:50 a.m.

1 stop10h 10m

London Heathrow

Thu 20/3

12:15 p.m.-7:25 p.m.

1 stop11h 10m

C$ 841

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 11/3

7:25 p.m.-6:55 a.m.

Nonstop7h 30m

London Heathrow

Tue 18/3

8:40 a.m.-4:45 p.m.

1 stop12h 05m

C$ 878

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 9/3

10:55 p.m.-10:05 a.m.

Nonstop7h 10m

London Heathrow

Tue 18/3

4:30 p.m.-8:45 p.m.

Nonstop8h 15m

C$ 881

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 9/3

12:15 p.m.-6:25 a.m.

1 stop14h 10m

London Heathrow

Tue 18/3

9:00 a.m.-5:25 p.m.

1 stop12h 25m

C$ 882

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 15/3

7:00 p.m.-1:05 p.m.

1 stop14h 05m

London Heathrow

Sat 22/3

9:05 a.m.-3:35 p.m.

1 stop34h 30m

C$ 912

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 20/3

9:45 p.m.-5:50 p.m.

1 stop16h 05m

London Heathrow

Fri 28/3

8:55 a.m.-5:25 p.m.

1 stop12h 30m

C$ 939

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 30/3

10:40 p.m.-11:05 a.m.

Nonstop7h 25m

London Heathrow

Tue 8/4

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

Nonstop8h 10m

C$ 940

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 26/3

11:20 p.m.-3:50 p.m.

1 stop12h 30m

London Heathrow

Sun 6/4

7:30 a.m.-3:50 p.m.

1 stop13h 20m

C$ 953

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/2

Showing 1-10 of 25 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.

Travel insights for flights from Dulles Intl to Heathrow

Get recent, data-driven insights about flights from Dulles Intl to Heathrow including ideal travel times, pricing trends, and more.

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 14 February 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 20 February 2025.

It’s optimal to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the morning. By choosing this option you can save up to 1% on the cost of your flight, compared to a flight at noon.

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 February 2025.

The most flights from IAD to LHR are scheduled on a Thursday (23 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 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 20 February 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
8,220 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Boarding

8.2

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
8,220 reviews
Delta
8.0
Very good
8,220 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Boarding

8.2

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
1,333 reviews
Delta
8.0
Very good
8,220 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Boarding

8.2

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
1,273 reviews
Delta
8.0
Very good
8,220 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Boarding

8.2

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
1,568 reviews
Delta
8.0
Very good
8,220 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Boarding

8.2

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.

Virgin Atlantic
7.5
Good
654 reviews
Delta
8.0
Very good
8,220 reviews
Check prices

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Boarding

8.2

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, Scandinavian Airlines (C$ 821), Icelandair (C$ 864), and United Airlines (C$ 871) 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 26% 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$ 382 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 Delta, with prices starting from C$ 446 and C$ 574, 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 Air France (93%), KLM (91%) or Delta (91%) 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$ 1,568, our data shows the cheapest flight currently is C$ 1,085. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay C$ 2,267 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
Slough
Luton
Milton Keynes
Romford
Watford
Bromley
Bedford
Southall

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