$590 Cheap Flights from London (LHR) to Washington (IAD)

View $590 flight on Tue, Apr 7, 2026Opens in a new window

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

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Cheap Flights from London to Washington (LHR-IAD)

Prices were available within the past 7 days and start at $590 for one-way flights and $381 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Mon, Aug 25 - Wed, Sep 10
LHR
London
IAD
Washington
$381 Roundtrip, found 5 hours ago
$381
Roundtrip
found 5 hours ago
Select TAP Portugal flight, departing Mon, Aug 25 from London to Washington, returning Wed, Sep 10, priced at $381 found 5 hours ago
Lufthansa
Mon, Aug 25 - Wed, Sep 10
LHR
London
IAD
Washington
$470 Roundtrip, found 5 hours ago
$470
Roundtrip
found 5 hours ago
Select Lufthansa flight, departing Mon, Aug 25 from London to Washington, returning Wed, Sep 10, priced at $470 found 5 hours ago
Brussels Airlines
Mon, Aug 25 - Wed, Sep 10
LHR
London
IAD
Washington
$484 Roundtrip, found 5 hours ago
$484
Roundtrip
found 5 hours ago
Select Brussels Airlines flight, departing Mon, Aug 25 from London to Washington, returning Wed, Sep 10, priced at $484 found 5 hours ago
Austrian Airlines
Mon, Aug 25 - Wed, Sep 10
LHR
London
IAD
Washington
$502 Roundtrip, found 5 hours ago
$502
Roundtrip
found 5 hours ago
Select Austrian Airlines flight, departing Mon, Aug 25 from London to Washington, returning Wed, Sep 10, priced at $502 found 5 hours ago
Iberia
Mon, Aug 25 - Wed, Sep 10
LHR
London
IAD
Washington
$529 Roundtrip, found 5 hours ago
$529
Roundtrip
found 5 hours ago
Select Iberia flight, departing Mon, Aug 25 from London to Washington, returning Wed, Sep 10, priced at $529 found 5 hours ago
Scandinavian Airlines
Fri, Oct 17 - Thu, Oct 30
LHR
London
IAD
Washington
$532 Roundtrip, found 4 days ago
$532
Roundtrip
found 4 days ago
Select Scandinavian Airlines flight, departing Fri, Oct 17 from London to Washington, returning Thu, Oct 30, priced at $532 found 4 days ago
Swiss International Air Lines
Fri, Oct 17 - Mon, Nov 3
LHR
London
IAD
Washington
$572 Roundtrip, found 2 days ago
$572
Roundtrip
found 2 days ago
Select Swiss International Air Lines flight, departing Fri, Oct 17 from London to Washington, returning Mon, Nov 3, priced at $572 found 2 days ago
Icelandair
Fri, Oct 3 - Mon, Oct 6
LHR
London
IAD
Washington
$573 Roundtrip, found 4 hours ago
$573
Roundtrip
found 4 hours ago
Select Icelandair flight, departing Fri, Oct 3 from London to Washington, returning Mon, Oct 6, priced at $573 found 4 hours ago
Air Canada
Sun, Aug 31 - Mon, Oct 20
LHR
London
IAD
Washington
$597 Roundtrip, found 3 days ago
$597
Roundtrip
found 3 days ago
Select Air Canada flight, departing Sun, Aug 31 from London to Washington, returning Mon, Oct 20, priced at $597 found 3 days ago
British Airways
Sun, Nov 23 - Tue, Dec 2
LHR
London
IAD
Washington
$600 Roundtrip, found 7 hours ago
$600
Roundtrip
found 7 hours ago
Select British Airways flight, departing Sun, Nov 23 from London to Washington, returning Tue, Dec 2, priced at $600 found 7 hours ago

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

October is typically the cheapest month to fly

From $471 - $779 per traveler.

Graph displaying average flight prices per month

Flights from London (LHR) to Washington (IAD)
Origin airport
Heathrow
Destination airport
Washington Dulles Intl.
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
$415
Distance
3666 mi
Average flight time
3 hours 15 mins

London to Washington Flights

The cheapest times to fly from London to Washington

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 London to Washington are during the month of August. You can find some of the cheapest flights from London to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from London to Washington

Sunday is one of the best days to book for cheap flights from London to Washington: 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 London to Washington

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 London to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $590 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 London to Washington 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 London to Washington 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.

 

Frequently asked questions

How much does a flight from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD) cost?
Book cheap return tickets starting at $624 from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a British Airways flight leaving LHR on August 3 2025 and touching down at IAD. The price was last updated on July 7 2025 and has not changed since.
What is the cheapest month to fly from LHR to IAD?
The cheapest flights from LHR to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
Avoid the layovers and travel nonstop from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD) with 3 carriers, including:

  • United Airlines
  • British Airways
  • Virgin Atlantic

What is the cheapest airline that flies from LHR to IAD?
At the moment, the cheapest carrier offering one-way flights from LHR to IAD is Lufthansa. You can book a seat on this route from $1574. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from LHR on September 29 2025. Prices were last updated on July 7 2025 and have not changed since.
How many flights per day from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
When taking off from Heathrow Airport (LHR), you can choose from an average of 4 daily nonstop flights to Washington Dulles Intl. Airport (IAD).
What are the most popular departure times for flights from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
The 4 PM departures from LHR to IAD are the busiest. Prices can be higher for these popular slots. If you're looking to save, choose a less crowded time to fly.
What day of the week has the most flights from LHR to IAD?
Thursday offers the most flights from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD). Consider jetting off on this day and you'll have the best chance of finding a departure that fits your itinerary.
What is the earliest flight from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
The first flight of the day leaving Heathrow Airport (LHR) is at around 12:05PM UTC+0. Hop on this flight and you'll land at Washington Dulles Intl. Airport (IAD) at approximately 3:40PM UTC-5. The total time in the air is 8h 35m.
How long does it take to fly from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
Flights from LHR to IAD have an average travel time of 8 hours and 34 minutes. The distance between the two airports is 3,700 mi.
What airline has the least delays from LHR to IAD?
With 91% of flights generally arriving on time, Lufthansa has the best on-time performance for direct flights from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD). To keep track of your flight status and get notifications about any changes, simply head to the Expedia App.
What is the best time to fly from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
Book a flight from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD) that leaves before 3 PM to reduce the risk of cancellations and delays. Departures after this hour have a 22% higher chance of being canceled, on average.**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 Washington from Heathrow Airport (LHR)?
Take a direct flight from Heathrow Airport (LHR) to Washington and arrive at Washington Dulles Intl. Airport (IAD). Another entry point into the city is Baltimore Washington Intl. Thurgood Marshall Airport (BWI).
Is it cheaper to buy a plane ticket from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD) last-minute?
Last-minute bookings from LHR to IAD are typically more expensive. To lock in the best prices, start looking for flights as soon as possible. That said, if you're flexible with your travel dates, you may find a cheap ticket right before your trip.
Is it cheaper to book a LHR to IAD flight and hotel package?
Securing a LHR to IAD flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Pick from our extensive range of stays and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
Usually, it's possible to cancel or reschedule your LHR to IAD flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more information on our Customer Service portal.

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