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$298+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — LHR
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to London Heathrow are usually found in February or January, booked 74 days in advance, depart on a Wednesday or Tuesday 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 June 12, 2025.

Round-trip from

$644
(Gotogate)

One-way from

$301
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$1,038

Good round-trip deal

$642 or less

Good one-way deal

$446 or less
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. 14% potential increase in price ($135 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Gotogate deal was found by Cheapflights users on 6/10. 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 9/18:30 pmBWI - LHR
1 stop18h 50mIcelandair
Sat 9/209:25 pmLHR - BWI
1 stop27h 00mIcelandair
Deal found 6/10$644
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/119:20 pmBWI - LHR
Nonstop7h 15mAmerican Airlines
Tue 9/161:10 pmLHR - BWI
1 stop14h 39mAmerican Airlines
Deal found 6/9$647
This Cheapflightsfares deal was found by Cheapflights users on 6/9. 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.
Wed 9/179:20 pmBWI - LHR
Nonstop7h 15mBritish Airways
Tue 9/234:35 pmLHR - BWI
Nonstop8h 00mBritish Airways
Deal found 6/9$649
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/135:15 pmBWI - LHR
1 stop10h 40mDelta
Tue 8/199:20 amLHR - BWI
1 stop13h 00mDelta
Deal found 6/10$652
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/306:35 pmIAD - LHR
Nonstop7h 20mUnited Airlines
Mon 8/412:10 pmLHR - IAD
1 stop33h 05mUnited Airlines
Deal found 6/10$656
This United Airlines deal was found by Cheapflights users on 6/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/310:51 amBWI - LHR
2 stops14h 54mUnited Airlines
Fri 9/123:20 pmLHR - BWI
2 stops23h 35mUnited Airlines
Deal found 6/9$657
This FlightHub deal was found by Cheapflights users on 6/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/229:35 amIAD - LHR
1 stop15h 55mMultiple Airlines
Mon 7/288:05 pmLHR - IAD
1 stop25h 10mMultiple Airlines
Deal found 6/9$657
This Virgin Atlantic deal was found by Cheapflights users on 6/10. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/164:51 pmDCA - LHR
1 stop10h 59mVirgin Atlantic
Sat 8/24:50 pmLHR - DCA
1 stop11h 45mVirgin Atlantic
Deal found 6/10$658
This Delta deal was found by Cheapflights users on 6/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/712:00 pmIAD - LHR
1 stop20h 10mDelta
Mon 7/218:10 pmLHR - IAD
1 stop20h 52mDelta
Deal found 6/9$658
This Air Canada deal was found by Cheapflights users on 6/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2011:00 amDCA - LHR
1 stop15h 10mMultiple Airlines
Tue 11/256:50 amLHR - DCA
2 stops13h 29mMultiple Airlines
Deal found 6/10$659
This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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 8/2410:05 pmIAD - LHR
1 stop18h 35mScandinavian Airlines
Sun 10/1910:20 amLHR - IAD
1 stop14h 39mScandinavian Airlines
Deal found 6/10$659
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/316:00 amDCA - LHR
1 stop23h 00mAir Canada
Wed 8/139:30 amLHR - DCA
1 stop17h 18mAir Canada
Deal found 6/10$660

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 June 12, 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

Mon 9/1

8:30 pm-8:20 pm

1 stop18h 50m

London Heathrow

Sat 9/20

9:25 pm-7:25 pm

1 stop27h 00m

$644

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Mon 8/11

9:20 pm-9:35 am

Nonstop7h 15m

London Heathrow

Tue 9/16

1:10 pm-10:49 pm

1 stop14h 39m

$647

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Wed 9/17

9:20 pm-9:35 am

Nonstop7h 15m

London Heathrow

Tue 9/23

4:35 pm-7:35 pm

Nonstop8h 00m

$649

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Wed 8/13

5:15 pm-8:55 am

1 stop10h 40m

London Heathrow

Tue 8/19

9:40 am-4:52 pm

1 stop12h 12m

$652

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 7/30

6:35 pm-6:55 am

Nonstop7h 20m

London Heathrow

Mon 8/4

12:10 pm-4:15 pm

1 stop33h 05m

$656

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 7/22

9:35 am-6:30 am

1 stop15h 55m

London Heathrow

Mon 7/28

8:05 pm-4:15 pm

1 stop25h 10m

$657

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Wed 9/3

10:51 am-6:45 am

2 stops14h 54m

London Heathrow

Fri 9/12

3:20 pm-9:55 am

2 stops23h 35m

$657

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Fri 7/18

1:08 pm-8:05 am

1 stop13h 57m

London Heathrow

Thu 7/31

9:40 am-10:04 pm

1 stop17h 24m

$658

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Wed 7/16

4:51 pm-8:50 am

1 stop10h 59m

London Heathrow

Sat 8/2

4:50 pm-11:35 pm

1 stop11h 45m

$658

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 7/7

12:00 pm-1:10 pm

1 stop20h 10m

London Heathrow

Mon 7/21

8:10 pm-12:02 pm

1 stop20h 52m

$658

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 60 results
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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

For evening departures, expect crowded check-in areas at IAD. Plan extra time for security and navigating the terminal layout.

Read more about IADby Ramsey Qubein
LHR

Take the Heathrow Express for the fastest route to central London from LHR. It connects to Paddington Station for further travel options.

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 June 9, 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 $1,108). 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 June 12, 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 15% 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 Wednesday 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.

Weekly flight availability from Washington, D.C. to London Heathrow Airport

Explore weekly flight availability from Washington, D.C. 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 June 12, 2025.

The most flights from WAS to LHR are scheduled on a Wednesday (27 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 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 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 June 12, 2025.
See what other customers who have flown with Delta, KLM and Austrian Airlines 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
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
802 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,290 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,623 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 $644. Additional round-trip tickets that might be worth considering are offered by American Airlines and British Airways, with the lowest prices starting at $647 and $650, respectively. Icelandair is currently priced 17% 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 $302 on Icelandair. Other airlines that offer cheap prices include TAP AIR PORTUGAL from $304 and JetBlue from $319 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: American Airlines (50%), Aer Lingus (50%), Finnair (50%).

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

    Looking at all options, your cheapest flight can be booked for $374. While the most popular route (Washington, D.C. Dulles Intl - London Heathrow) can be booked for $426 on average our data indicates $1,844 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 $66 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 $1,108). 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

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest$379Average$523FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$394Average$597FlexibilityNo cancel feeOn-time77%
DeltaCheapest$421Average$847FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$435Average$572FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$486Average$758FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$549Average$750FlexibilityNo cancel feeOn-time67%
LufthansaCheapest$552Average$868FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$555Average$758FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$562Average$719FlexibilityNo cancel feeOn-time77%
SWISSCheapest$572Average$789FlexibilityNo cancel feeOn-time79%

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