$238 Cheap Flights from Washington (IAD) to London (LGW)

View $238 flight on Mon, Aug 11, 2025Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW)

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Cheap Flights from Washington to London (IAD-LGW)

Prices were available within the past 7 days and start at $238 for one-way flights and $447 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Tue, Sep 9 - Tue, Sep 16
IAD
Washington
LGW
London
$447 Roundtrip, found 2 hours ago
$447
Roundtrip
found 2 hours ago
Select TAP Portugal flight, departing Tue, Sep 9 from Washington to London, returning Tue, Sep 16, priced at $447 found 2 hours ago
TAP Portugal
Thu, Oct 9 - Tue, Oct 14
IAD
Washington
LGW
London
$454 Roundtrip, found 1 hour ago
$454
Roundtrip
found 1 hour ago
Select TAP Portugal flight, departing Thu, Oct 9 from Washington to London, returning Tue, Oct 14, priced at $454 found 1 hour ago
TAP Portugal
Tue, Sep 2 - Tue, Sep 16
IAD
Washington
LGW
London
$455 Roundtrip, found 1 day ago
$455
Roundtrip
found 1 day ago
Select TAP Portugal flight, departing Tue, Sep 2 from Washington to London, returning Tue, Sep 16, priced at $455 found 1 day ago
TAP Portugal
Wed, Mar 18 - Wed, Mar 25
IAD
Washington
LGW
London
$461 Roundtrip, found 5 hours ago
$461
Roundtrip
found 5 hours ago
Select TAP Portugal flight, departing Wed, Mar 18 from Washington to London, returning Wed, Mar 25, priced at $461 found 5 hours ago
Icelandair
Fri, Mar 13 - Mon, Mar 16
IAD
Washington
LGW
London
$470 Roundtrip, found 4 hours ago
$470
Roundtrip
found 4 hours ago
Select Icelandair flight, departing Fri, Mar 13 from Washington to London, returning Mon, Mar 16, priced at $470 found 4 hours ago
American Airlines
Sun, Aug 17 - Thu, Aug 28
IAD
Washington
LGW
London
$493 Roundtrip, found 8 hours ago
$493
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Sun, Aug 17 from Washington to London, returning Thu, Aug 28, priced at $493 found 8 hours ago
Icelandair
Thu, Aug 14 - Wed, Aug 20
IAD
Washington
LGW
London
$499 Roundtrip, found 1 day ago
$499
Roundtrip
found 1 day ago
Select Icelandair flight, departing Thu, Aug 14 from Washington to London, returning Wed, Aug 20, priced at $499 found 1 day ago
American Airlines
Tue, Sep 9 - Tue, Sep 16
IAD
Washington
LGW
London
$501 Roundtrip, found 2 hours ago
$501
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Tue, Sep 9 from Washington to London, returning Tue, Sep 16, priced at $501 found 2 hours ago
Iberia
Mon, Aug 11 - Mon, Sep 8
IAD
Washington
LGW
London
$506 Roundtrip, found 1 day ago
$506
Roundtrip
found 1 day ago
Select Iberia flight, departing Mon, Aug 11 from Washington to London, returning Mon, Sep 8, priced at $506 found 1 day ago
British Airways
Wed, Aug 13 - Wed, Aug 27
IAD
Washington
LGW
London
$507 Roundtrip, found 6 days ago
$507
Roundtrip
found 6 days ago
Select British Airways flight, departing Wed, Aug 13 from Washington to London, returning Wed, Aug 27, priced at $507 found 6 days ago

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

September is typically the cheapest month to fly

From $454 - $914 per traveler.

Graph displaying average flight prices per month

Flights from Washington (IAD) to London (LGW)
Origin airport
Washington Dulles Intl.
Destination airport
Gatwick
Airlines serving
Air France, American Airlines, British Airways, Delta, ITA Airways, Iberia, Icelandair, KLM, Royal Air Maroc, Swiss International Air Lines, TAP Portugal, Turkish Airlines, Virgin Atlantic
Roundtrip price
$446
Distance
3685 mi

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 September. 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 2025. You can also book with separate airlines for your outbound and return journeys, from $238 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.

 

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW) cost?
Discover the latest flight deals from IAD to LGW by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from IAD to LGW?
The cheapest flights from IAD to LGW are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from IAD to LGW?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from IAD to LGW. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW)?
You'll need to hop on a flight with a layover when traveling from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from IAD to LGW?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW)?
Select a flight from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW) that takes off before 3 PM to reduce the likelihood of delays. Later departures are on average 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)?
Browse your flight options from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR). This is the only airport in London you can jet into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW) last-minute?
Holding off until just before your departure to book a ticket from IAD to LGW generally means paying more. While you might find some last-minute deals, they're not always guaranteed. Allow some flexibility in your schedule to boost your chances of scoring a bargain.
Is it cheaper to book an IAD to LGW flight and hotel package?
You'll generally save money by booking an IAD to LGW flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one place. Once you've chosen your preferred accommodations and flights, you can add extras like activities, car rentals and tours.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW)?
In most instances, you can cancel or modify your IAD to LGW flight. However, there may be additional charges, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's guidelines and fees on flight changes, or if you need more information, go to our Customer Service portal.

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*Available to One Key members.