$377 Cheap Flights from Washington (IAD) to London (LHR)

View $377 flight on Mon, Mar 16, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)

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Cheap Flights from Washington to London (IAD-LHR)

Prices were available within the past 7 days and start at $377 for one-way flights and $466 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Sun, Apr 26 - Wed, May 6
IAD
Washington
LHR
London
$466 Roundtrip, found 4 hours ago
$466
Roundtrip
found 4 hours ago
Select TAP Portugal flight, departing Sun, Apr 26 from Washington to London, returning Wed, May 6, priced at $466 found 4 hours ago
Icelandair
Thu, Oct 22 - Fri, Oct 30
IAD
Washington
LHR
London
$478 Roundtrip, found 5 hours ago
$478
Roundtrip
found 5 hours ago
Select Icelandair flight, departing Thu, Oct 22 from Washington to London, returning Fri, Oct 30, priced at $478 found 5 hours ago
Scandinavian Airlines
Thu, Oct 22 - Fri, Oct 30
IAD
Washington
LHR
London
$511 Roundtrip, found 5 hours ago
$511
Roundtrip
found 5 hours ago
Select Scandinavian Airlines flight, departing Thu, Oct 22 from Washington to London, returning Fri, Oct 30, priced at $511 found 5 hours ago
Lufthansa
Wed, Jul 22 - Fri, Aug 21
IAD
Washington
LHR
London
$535 Roundtrip, found 2 days ago
$535
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Wed, Jul 22 from Washington to London, returning Fri, Aug 21, priced at $535 found 2 days ago
United
Wed, Jul 22 - Fri, Aug 21
IAD
Washington
LHR
London
$554 Roundtrip, found 2 days ago
$554
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jul 22 from Washington to London, returning Fri, Aug 21, priced at $554 found 2 days ago
Air Canada
Wed, Jul 22 - Fri, Aug 21
IAD
Washington
LHR
London
$555 Roundtrip, found 2 days ago
$555
Roundtrip
found 2 days ago
Select Air Canada flight, departing Wed, Jul 22 from Washington to London, returning Fri, Aug 21, priced at $555 found 2 days ago
Virgin Atlantic
Tue, Aug 4 - Tue, Aug 11
IAD
Washington
LHR
London
$602 Roundtrip, found 13 hours ago
$602
Roundtrip
found 13 hours ago
Select Virgin Atlantic flight, departing Tue, Aug 4 from Washington to London, returning Tue, Aug 11, priced at $602 found 13 hours ago
Delta
Thu, Apr 2 - Wed, Apr 8
IAD
Washington
LHR
London
$614 Roundtrip, found 8 hours ago
$614
Roundtrip
found 8 hours ago
Select Delta flight, departing Thu, Apr 2 from Washington to London, returning Wed, Apr 8, priced at $614 found 8 hours ago
Swiss International Air Lines
Thu, Oct 22 - Fri, Oct 30
IAD
Washington
LHR
London
$624 Roundtrip, found 5 hours ago
$624
Roundtrip
found 5 hours ago
Select Swiss International Air Lines flight, departing Thu, Oct 22 from Washington to London, returning Fri, Oct 30, priced at $624 found 5 hours ago
Brussels Airlines
Sun, Aug 2 - Sat, Aug 22
IAD
Washington
LHR
London
$635 Roundtrip, found 1 day ago
$635
Roundtrip
found 1 day ago
Select Brussels Airlines flight, departing Sun, Aug 2 from Washington to London, returning Sat, Aug 22, priced at $635 found 1 day ago

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Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Gatwick LGW. Average driving time to city center is 52 minutes. Flights from $1,296
LGW
Gatwick
Average driving time to city center52 min
Flights from $1,296
Select flight to London City LCY. Closest option available. Average driving time to city center is 21 minutes. Flights from $898
LCY
London City
Closest
Average driving time to city center21 min
Flights from $898

Find the cheapest month to fly from Washington (IAD) to London (LHR)

February is typically the cheapest month to fly

From $444 - $791 per traveler.

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR) cost?
Get a cheap one-way flight from $377 or cheap return flight from $466 from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
Planning your getaway for April is a great way to save, as it's the cheapest month for flights between IAD and LHR. You'll typically find the lowest fares during off-peak months.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
Skip the layovers and fly direct to Heathrow Airport (LHR) from Washington Dulles Intl. Airport (IAD) with 3 carriers, including:

  • British Airways
  • United Airlines
  • Virgin Atlantic

What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
The cheapest airline to offer flights between Washington Dulles Intl. Airport (IAD) and Heathrow Airport (LHR) will vary based on your travel plans. Virgin Atlantic and British Airways are just some good options offering reasonable prices. Use Expedia's filter tool to compare airlines in one place and find the right IAD to LHR flight that fits your budget.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
When flying out of Washington Dulles Intl. Airport (IAD), you can take your pick from an average of 4 daily direct flights to Heathrow Airport (LHR).
What are the most popular departure times for flights from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
The 6 PM departures from IAD to LHR are the most sought after. Prices can be higher for these popular slots. If you want to save on your trip, book during off-peak hours.
What day of the week has the most flights from IAD to LHR?
Depart on a Friday if you're looking for the best selection of flights from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR).
What is the earliest flight from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
The earliest flight taking off from Washington Dulles Intl. Airport (IAD) is at around 6:00PM UTC-5. Board this plane and you'll touch down at Heathrow Airport (LHR) at approximately 6:15AM UTC+0. The entire trip takes 7h 15m.
How long does it take to fly from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
The average flight duration from IAD to LHR is 7 hours and 17 minutes, covering a distance of 3,700 mi.
What airline has the least delays from IAD to LHR?
With 80% of journeys typically arriving as scheduled, American Airlines has the best on-time performance for nonstop flights from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR). To check your flight status and receive notifications if anything changes, use the Expedia App.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
To avoid possible delays on the Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR) route, aim to fly before 3 PM. Departures after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for London from Washington Dulles Intl. Airport (IAD)?
Heathrow Airport (LHR) is the only airport in London with direct flights from Washington Dulles Intl. Airport (IAD). Compare your options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR) last-minute?
Booking your ticket from IAD to LHR just before your trip is typically more expensive. However, if there's some wiggle room with your itinerary, you could grab a cheap last-minute fare.
Is it cheaper to book an IAD to LHR flight and hotel package?
You can save money by booking an IAD to LHR flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. After selecting your preferred accommodations and flights, consider adding extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
You can usually cancel or reschedule your IAD to LHR flight. However, for bookings made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Roundtrip price
$466
Distance
3666 mi
Average flight time
11 hours 20 mins

Book with confidence

Washington to London Flights

The cheapest times to fly from Washington to London

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to London are during the month of April. You can find some of the cheapest flights from Washington to London with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to London

Sunday is one of the best days to book for cheap flights from Washington to London: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to London

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to London in 2026. You can also book with separate airlines for your outbound and return journeys, from $377 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to London flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to London airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Washington to London Flights

*Flight schedules are subject to change.

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