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$240+ Cheap flights from Washington, D.C. (WAS) to Heathrow (LHR)

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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — LHR
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to London Heathrow are usually found in October or February, booked 74 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from Washington, D.C. to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) 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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$550
(Gotogate)

One-way from

$240
(oojo)

Popular in

June

Cheapest in

October

Average price

$697

Good round-trip deal

$693 or less

Good one-way deal

$447 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-London Heathrow flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-London Heathrow flights.
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From Washington, D.C. (WAS) to London Heathrow
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One-way flight from Washington, D.C. (WAS) to London Heathrow
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Highest demand for flights based on searches. 16% potential increase in price ($153 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($28 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. (WAS) to London Heathrow.
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Price to beat on a one-way flight from Washington, D.C. (WAS) to London Heathrow.
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Find flight deals from Washington, D.C. to Heathrow

Cheapest flights from Washington, D.C. to Heathrow
Explore the most affordable flight options available from Washington, D.C. to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

This Mytrip deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/18:30 pmBWI - LHR
1 stop18h 50mIcelandair
Wed 5/71:05 pmLHR - BWI
1 stop11h 20mIcelandair
Deal found 3/27$550
This Mytrip deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/56:50 pmBWI - LHR
2 stops18h 40mMultiple Airlines
Wed 5/216:40 amLHR - BWI
2 stops16h 00mMultiple Airlines
Deal found 3/26$582
This Gotogate deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/128:30 pmIAD - LHR
1 stop18h 50mIcelandair
Mon 5/199:25 pmLHR - IAD
1 stop26h 55mIcelandair
Deal found 3/27$591
This Booking.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/3010:05 pmIAD - LHR
1 stop30h 15mScandinavian Airlines
Sun 9/79:05 pmLHR - IAD
2 stops27h 54mScandinavian Airlines
Deal found 3/27$592
This JetBlue deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/226:30 amDCA - LHR
1 stop9h 15mJetBlue
Thu 10/911:55 amLHR - DCA
1 stop16h 04mJetBlue
Deal found 3/26$593
This eDestinos deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2310:40 pmIAD - LHR
Nonstop7h 25mIberia
Wed 4/306:15 amLHR - IAD
1 stop13h 45mIberia
Deal found 3/27$604
This eDestinos deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/239:00 pmIAD - LHR
1 stop11h 25mAer Lingus
Wed 4/301:25 pmLHR - IAD
1 stop11h 05mAer Lingus
Deal found 3/27$618
This Cheapflightsfares deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/219:20 pmBWI - LHR
Nonstop7h 15mIberia
Tue 9/304:35 pmLHR - BWI
Nonstop8h 00mIberia
Deal found 3/27$642
This Booking.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/215:50 pmIAD - LHR
Nonstop7h 30mVirgin Atlantic
Tue 4/299:00 amLHR - IAD
1 stop12h 20mVirgin Atlantic
Deal found 3/27$643
This Gotogate deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2112:55 pmDCA - LHR
1 stop12h 35mAir Canada
Tue 4/293:50 pmLHR - DCA
1 stop11h 38mAir Canada
Deal found 3/27$644
This oojo deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/2010:40 pmIAD - LHR
Nonstop7h 25mBritish Airways
Thu 5/86:15 amLHR - IAD
2 stops22h 47mBritish Airways
Deal found 3/27$647
This TAP AIR PORTUGAL deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/115:30 pmIAD - LHR
1 stop24h 10mTAP AIR PORTUGAL
Wed 11/196:30 pmLHR - IAD
1 stop25h 45mTAP AIR PORTUGAL
Deal found 3/27$648

Cheapflights Fare Finder

Customize your flight search to find flights from Washington, D.C. 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 2,558,603 searches. Data last updated March 28, 2025.
Use the filters below to find and compare flights from Washington, D.C. to London Heathrow Airport that are best for you.

Fly from

Washington, D.C.

Fly to

Heathrow

Route

Depart

Return

Price

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Thu 5/1

8:30 pm-8:20 pm

1 stop18h 50m

London Heathrow

Wed 5/7

1:05 pm-7:25 pm

1 stop11h 20m

$550

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Mon 5/5

6:50 pm-6:30 pm

2 stops18h 40m

London Heathrow

Wed 5/21

6:40 am-5:40 pm

2 stops16h 00m

$581

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 5/4

10:05 pm-9:40 pm

1 stop18h 35m

London Heathrow

Sun 5/11

10:20 am-7:59 pm

1 stop14h 39m

$591

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Thu 4/3

10:39 am-6:30 am

1 stop14h 51m

London Heathrow

Thu 4/10

8:25 am-4:59 pm

1 stop13h 34m

$593

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 5/1

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

Sun 5/11

9:25 pm-7:20 pm

1 stop26h 55m

$599

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 4/23

10:40 pm-11:05 am

Nonstop7h 25m

London Heathrow

Wed 4/30

6:15 am-3:00 pm

1 stop13h 45m

$604

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 4/21

5:50 pm-6:20 am

Nonstop7h 30m

London Heathrow

Tue 4/29

11:45 am-3:35 pm

1 stop32h 50m

$619

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 4/23

5:20 pm-9:05 am

1 stop10h 45m

London Heathrow

Thu 4/24

12:00 pm-6:55 pm

1 stop11h 55m

$624

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 5/21

10:15 pm-10:40 am

Nonstop7h 25m

London Heathrow

Fri 5/23

8:40 am-4:15 pm

1 stop12h 35m

$630

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 4/15

3:55 pm-6:30 am

1 stop9h 35m

London Heathrow

Wed 4/23

7:30 pm-2:35 pm

1 stop24h 05m

$636

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 60 results
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Compare providers for flights from Washington, D.C. to Heathrow

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to Heathrow in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C.-London Heathrow Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-London Heathrow Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C.-London Heathrow Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Washington, D.C. to London Heathrow Airport flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to London Heathrow Airport trip
Airports
IAD

In the afternoon and evening, IAD's check-in area can be crowded. Arrive early to navigate the busy terminals efficiently.

Read more about IADby Ramsey Qubein
LHR

For quick access to central London, take the Heathrow Express to Paddington Station. It's the fastest way into town from LHR.

Read more about LHRby Ramsey Qubein
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR and IAD

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Best time to book a flight from Washington, D.C. to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Washington, D.C. 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. to London Heathrow Airport

How far ahead should I book a flight from Washington, D.C. to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to Heathrow. Price data was last updated on March 21, 2025.

Booking 74 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Washington, D.C. to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Washington, D.C. to London Heathrow Airport (average of $661). Flying from Washington, D.C. to London Heathrow Airport in June is currently the most expensive (average of $1,115). 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 WAS to LHR?

Find hourly flight availability from Washington, D.C. 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 March 28, 2025.

It’s typically best to fly out from Washington, D.C. to London Heathrow Airport in the morning. Doing so could potentially save you 19% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Washington, D.C. to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Heathrow. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. to London Heathrow Airport flight should consider departing on Tuesday mornings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 March 28, 2025.
See what other customers who have flown with Delta, KLM and Finnair from Washington, D.C. to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,896 reviews

Entertainment

7.9

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.3

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

Entertainment

7.9

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.3

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
1,321 reviews
Delta
8.0
Very good
7,896 reviews

Entertainment

7.9

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.3

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
1,267 reviews
Delta
8.0
Very good
7,896 reviews

Entertainment

7.9

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.3

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
1,570 reviews
Delta
8.0
Very good
7,896 reviews

Entertainment

7.9

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.3

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
1,424 reviews
Delta
8.0
Very good
7,896 reviews

Entertainment

7.9

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.3

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 Washington, D.C. 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. to London Heathrow Airport round-trip?

    Flying on Icelandair is currently your cheapest option to London Heathrow Airport, with prices starting at $550. Additional round-trip tickets that might be worth considering are offered by Scandinavian Airlines and JetBlue, with the lowest prices starting at $591 and $593, respectively. Icelandair is currently priced 29% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Washington, D.C. to London Heathrow Airport one-way?

    One-way options have recently been found by users for as low as $240 on Icelandair. Other airlines that offer cheap prices include TAP AIR PORTUGAL from $245 and JetBlue from $249 one-way.

  • What are the most popular routes from Washington, D.C. to London Heathrow Airport?

    The most popular flight routes from Washington, D.C. to London Heathrow Airport are Washington, D.C. Dulles Intl - London Heathrow, Baltimore/Washington - London Heathrow and Washington, D.C. Reagan-National - London Heathrow.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. to London Heathrow Airport on time: KLM (94%), Delta (94%), Air France (93%).

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

    Looking at all options, your cheapest flight can be booked for $380. While the most popular route (Washington, D.C. Dulles Intl - London Heathrow) can be booked for $398 on average our data indicates $2,637 when flying from Washington, D.C. to London Heathrow Airport.

  • Where are the most common layover locations when flying from Washington, D.C. to London Heathrow Airport?

    Washington, D.C. to London Heathrow Airport flights have a layover in Reykjavik most of the time.

  • What are some popular things to do or see while on a layover in Reykjavik?

    Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are the most popular attractions in Reykjavik if you're in need of something to do during your layover. Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool can be accessed by traveling approximately 23.2 mi, 23.3 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Those looking to explore during their layover in Reykjavik can rent a car from Reykjavik Keflavik Intl for about $55 per day.

  • Where are the least popular layover locations for Washington, D.C. to London Heathrow Airport flights?

    Washington, D.C. to London Heathrow Airport flights that have layovers will least frequently stop in Dublin.

  • Can I find deals for flights from Washington, D.C. to Heathrow that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Heathrow.

  • Can I find deals for business class flights from Washington, D.C. to Heathrow?

    Yes. Cheapflights offers flight deals from Washington, D.C. 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. to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Washington, D.C. to London Heathrow Airport (average of $661). Flying from Washington, D.C. to London Heathrow Airport in June is currently the most expensive (average of $1,115). 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

Traveling to a place near Washington, D.C.?

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Top 10 airlines flying from Washington, D.C. to Heathrow

Discover the top 10 airlines that operate flights from Washington, D.C. 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 2,558,603 searches. Data last updated March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$370Average$598FlexibilityNo cancel feeOn-time77%
PLAYCheapest$384Average$528FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$474Average$617FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$486Average$758FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$498Average$680FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$549Average$750FlexibilityNo cancel feeOn-time67%
DeltaCheapest$560Average$888FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$562Average$755FlexibilityNo cancel feeOn-time77%
FinnairCheapest$571Average$764FlexibilityNo cancel feeOn-time76%
SWISSCheapest$572Average$806FlexibilityNo cancel feeOn-time79%
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