$231 Cheap Flights from Washington (IAD) to London (LGW)

View $231 flight on Tue, Oct 21, 2025Opens in a new window

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

Cheap Flights from Washington to London (IAD-LGW)

Prices were available within the past 7 days and start at $231 for one-way flights and $396 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Fri, Jan 9 - Wed, Jan 14
IAD
Washington
LGW
London
$396 Roundtrip, found 14 hours ago
$396
Roundtrip
found 14 hours ago
Select Icelandair flight, departing Fri, Jan 9 from Washington to London, returning Wed, Jan 14, priced at $396 found 14 hours ago
TAP Portugal
Wed, Dec 3 - Wed, Dec 10
IAD
Washington
LGW
London
$444 Roundtrip, just found
$444
Roundtrip
just found
Select TAP Portugal flight, departing Wed, Dec 3 from Washington to London, returning Wed, Dec 10, priced at $444 just found
TAP Portugal
Tue, Jan 13 - Wed, Jan 21
IAD
Washington
LGW
London
$445 Roundtrip, found 2 days ago
$445
Roundtrip
found 2 days ago
Select TAP Portugal flight, departing Tue, Jan 13 from Washington to London, returning Wed, Jan 21, priced at $445 found 2 days ago
TAP Portugal
Wed, Dec 3 - Wed, Dec 10
IAD
Washington
LGW
London
$451 Roundtrip, just found
$451
Roundtrip
just found
Select TAP Portugal flight, departing Wed, Dec 3 from Washington to London, returning Wed, Dec 10, priced at $451 just found
TAP Portugal
Thu, Jan 29 - Tue, Feb 3
IAD
Washington
LGW
London
$452 Roundtrip, found 2 days ago
$452
Roundtrip
found 2 days ago
Select TAP Portugal flight, departing Thu, Jan 29 from Washington to London, returning Tue, Feb 3, priced at $452 found 2 days ago
TAP Portugal
Sun, Jan 25 - Tue, Feb 3
IAD
Washington
LGW
London
$459 Roundtrip, found 5 hours ago
$459
Roundtrip
found 5 hours ago
Select TAP Portugal flight, departing Sun, Jan 25 from Washington to London, returning Tue, Feb 3, priced at $459 found 5 hours ago
TAP Portugal
Sun, Nov 30 - Wed, Dec 10
IAD
Washington
LGW
London
$460 Roundtrip, found 2 hours ago
$460
Roundtrip
found 2 hours ago
Select TAP Portugal flight, departing Sun, Nov 30 from Washington to London, returning Wed, Dec 10, priced at $460 found 2 hours ago
American Airlines
Sun, Nov 23 - Wed, Dec 3
IAD
Washington
LGW
London
$562 Roundtrip, found 8 hours ago
$562
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Sun, Nov 23 from Washington to London, returning Wed, Dec 3, priced at $562 found 8 hours ago
Swiss International Air Lines
Sun, Nov 23 - Wed, Dec 3
IAD
Washington
LGW
London
$611 Roundtrip, found 8 hours ago
$611
Roundtrip
found 8 hours ago
Select Swiss International Air Lines flight, departing Sun, Nov 23 from Washington to London, returning Wed, Dec 3, priced at $611 found 8 hours ago
British Airways
Tue, Dec 2 - Wed, Dec 10
IAD
Washington
LGW
London
$613 Roundtrip, found 1 day ago
$613
Roundtrip
found 1 day ago
Select British Airways flight, departing Tue, Dec 2 from Washington to London, returning Wed, Dec 10, priced at $613 found 1 day ago

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

November is typically the cheapest month to fly

From $446 - $914 per traveler.

Alternative airports near London

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

Select flight to Heathrow LHR. Cheapest option available. Average driving time to city center is 28 minutes. Flights from $609
LHR
Heathrow
Cheapest
Average driving time to city center28 min
Flights from $609
Select flight to London City LCY. Closest option available. Average driving time to city center is 21 minutes. Flights from $684
LCY
London City
Closest
Average driving time to city center21 min
Flights from $684

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW) cost?
Secure a cheap one-way flight from $231 or cheap return flight from $396 from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW)?
January is the cheapest month to fly from IAD to LGW. Traveling during an off-peak travel window is often the key to better flight prices.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Gatwick Airport (LGW)?
Use the filters on Expedia to compare different airlines and find the cheapest carrier that'll fly you from IAD to LGW. Then, sort your results by "Price (lowest to highest)" to snag 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.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Gatwick
Airlines serving
American Airlines, British Airways, Iberia, Icelandair, Royal Air Maroc, Swiss International Air Lines, TAP Portugal, Turkish Airlines
Roundtrip price
$396
Distance
3685 mi

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 January. 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 $231 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

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*Available to One Key members.