Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 357

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 27/7. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
20 Apr — 27 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 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 15 April 2025.

Round-trip from

C$ 830

One-way from

C$ 385

Popular in

June

Cheapest in

September

Average price

C$ 990

Good round-trip deal

C$ 1,160 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 17/8-27/8
  • 2 total stops
  • 59h 44m total
  • Washington, D.C. to London
Search Deals
Icelandair
  • Icelandair
  • 13/5
  • 1 total stop
  • 10h 25m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (C$ 287 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 55 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals
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 15 April 2025.

Sun 17/810:05 p.m.IAD - LHR
1 stop30h 15mScandinavian Airlines
Wed 27/87:30 p.m.LHR - IAD
1 stop29h 29mScandinavian Airlines
Deal found 14/4C$ 830
Wed 30/46:30 p.m.IAD - LHR
Nonstop7h 25mUnited Airlines
Wed 7/58:40 a.m.LHR - IAD
1 stop12h 35mUnited Airlines
Deal found 14/4C$ 836
Wed 3/98:30 p.m.IAD - LHR
1 stop10h 25mIcelandair
Wed 10/91:05 p.m.LHR - IAD
1 stop14h 05mIcelandair
Deal found 14/4C$ 837
Sun 27/410:40 p.m.IAD - LHR
Nonstop7h 25mFinnair
Tue 13/512:45 p.m.LHR - IAD
Nonstop8h 00mFinnair
Deal found 14/4C$ 851
Tue 22/45:50 p.m.IAD - LHR
Nonstop7h 30mDelta
Tue 29/49:00 a.m.LHR - IAD
1 stop15h 15mDelta
Deal found 15/4C$ 854
Tue 22/48:45 p.m.IAD - LHR
1 stop30h 10mSWISS
Mon 12/56:40 p.m.LHR - IAD
1 stop26h 35mSWISS
Deal found 15/4C$ 866
Wed 24/99:55 a.m.IAD - LHR
1 stop15h 35mAir Canada
Thu 9/1012:05 p.m.LHR - IAD
2 stops13h 56mAir Canada
Deal found 15/4C$ 872
Tue 22/45:25 p.m.IAD - LHR
1 stop33h 55mAustrian Airlines
Mon 28/47:30 p.m.LHR - IAD
1 stop24h 05mAustrian Airlines
Deal found 15/4C$ 882
Mon 11/85:35 p.m.IAD - LHR
1 stop18h 30mBrussels Airlines
Wed 20/87:45 a.m.LHR - IAD
1 stop10h 45mBrussels Airlines
Deal found 15/4C$ 887
Wed 23/45:40 p.m.IAD - LHR
Nonstop7h 35mBritish Airways
Tue 29/45:00 p.m.LHR - IAD
Nonstop8h 10mBritish Airways
Deal found 15/4C$ 894
Mon 4/85:50 p.m.IAD - LHR
Nonstop7h 30mVirgin Atlantic
Thu 14/89:00 a.m.LHR - IAD
1 stop15h 15mVirgin Atlantic
Deal found 15/4C$ 902
Mon 4/810:20 p.m.IAD - LHR
1 stop13h 45mLufthansa
Wed 20/810:50 a.m.LHR - IAD
1 stop13h 35mLufthansa
Deal found 15/4C$ 909

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 15 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 17/8

10:05 p.m.-9:20 a.m.

1 stop30h 15m

London Heathrow

Wed 27/8

7:30 p.m.-7:59 p.m.

1 stop29h 29m

C$ 830

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 30/4

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

Nonstop7h 25m

London Heathrow

Wed 7/5

8:40 a.m.-4:15 p.m.

1 stop12h 35m

C$ 836

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 3/9

8:30 p.m.-11:55 a.m.

1 stop10h 25m

London Heathrow

Wed 10/9

1:05 p.m.-10:10 p.m.

1 stop14h 05m

C$ 837

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 27/4

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

Nonstop7h 25m

London Heathrow

Tue 13/5

12:45 p.m.-3:45 p.m.

Nonstop8h 00m

C$ 851

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 13/5

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

Nonstop7h 30m

London Heathrow

Thu 22/5

9:00 a.m.-4:20 p.m.

1 stop12h 20m

C$ 854

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 6/8

8:45 p.m.-4:25 p.m.

1 stop14h 40m

London Heathrow

Mon 25/8

8:05 p.m.-4:15 p.m.

1 stop25h 10m

C$ 866

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 24/9

9:55 a.m.-6:30 a.m.

1 stop15h 35m

London Heathrow

Thu 9/10

12:05 p.m.-9:01 p.m.

2 stops13h 56m

C$ 872

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 25/4

5:20 p.m.-8:00 a.m.

1 stop9h 40m

London Heathrow

Thu 1/5

7:40 a.m.-3:50 p.m.

1 stop13h 10m

C$ 882

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 11/8

5:35 p.m.-5:05 p.m.

1 stop18h 30m

London Heathrow

Wed 20/8

7:45 a.m.-1:30 p.m.

1 stop10h 45m

C$ 887

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 4/8

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

Nonstop7h 30m

London Heathrow

Thu 14/8

9:00 a.m.-7:15 p.m.

1 stop15h 15m

C$ 902

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/4

Showing 1-10 of 25 results
1
2
3

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 11 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 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 15 April 2025.

It’s optimal to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport at noon. By choosing this option you can save up to 7% on the cost of your flight, compared to 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 15 April 2025.

The most flights from IAD to LHR are scheduled on a Monday (25 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (21 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 15 April 2025.
Peruse reviews from past customers who have flown with Delta, Air France and SWISS 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
7,917 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

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
7,917 reviews
Delta
8.0
Very good
7,917 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

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
1,269 reviews
Delta
8.0
Very good
7,917 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

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
7.5
Good
1,435 reviews
Delta
8.0
Very good
7,917 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

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
1,578 reviews
Delta
8.0
Very good
7,917 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

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.
United Airlines
7.4
Good
8,658 reviews
Delta
8.0
Very good
7,917 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

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?

    According to our current data, Scandinavian Airlines (C$ 830), United Airlines (C$ 836), and Icelandair (C$ 837) 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 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?

    C$ 385 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on Virgin Atlantic and United Airlines, with prices starting from C$ 548 and C$ 558, 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 Delta (94%), Singapore Airlines (92%) or Virgin Atlantic (92%) 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$ 1,182, our data shows the cheapest flight currently is C$ 953. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay C$ 923 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers 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?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from Dulles Intl today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Heathrow?

Millions of users choose and trust Cheapflights to book the best flight deals from Dulles Intl to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Dulles Intl to Heathrow with no change fees?

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.

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!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.