$572 Cheap Flights from London (STN) to Washington (IAD)

View $572 flight on Fri, Dec 26, 2025Opens in a new window

Popular airlines from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD)

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from London to Washington (STN-IAD)

Prices were available within the past 7 days and start at $572 for one-way flights and $991 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Royal Air Maroc
Fri, Dec 26 - Sun, Jan 11
STN
London
IAD
Washington
$991 Roundtrip, found 3 days ago
$991
Roundtrip
found 3 days ago
Select Royal Air Maroc flight, departing Fri, Dec 26 from London to Washington, returning Sun, Jan 11, priced at $991 found 3 days ago
Royal Air Maroc
Sun, Dec 14 - Fri, Jan 2
STN
London
IAD
Washington
$1,070 Roundtrip, found 4 days ago
$1,070
Roundtrip
found 4 days ago
Select Royal Air Maroc flight, departing Sun, Dec 14 from London to Washington, returning Fri, Jan 2, priced at $1,070 found 4 days ago
Royal Air Maroc
Fri, Dec 19 - Fri, Jan 2
STN
London
IAD
Washington
$1,292 Roundtrip, found 6 days ago
$1,292
Roundtrip
found 6 days ago
Select Royal Air Maroc flight, departing Fri, Dec 19 from London to Washington, returning Fri, Jan 2, priced at $1,292 found 6 days ago
Royal Air Maroc
Fri, Dec 19 - Sun, Jan 4
STN
London
IAD
Washington
$1,332 Roundtrip, found 3 days ago
$1,332
Roundtrip
found 3 days ago
Select Royal Air Maroc flight, departing Fri, Dec 19 from London to Washington, returning Sun, Jan 4, priced at $1,332 found 3 days ago
Royal Air Maroc
Sun, Dec 28 - Sun, Jan 4
STN
London
IAD
Washington
$1,382 Roundtrip, found 2 days ago
$1,382
Roundtrip
found 2 days ago
Select Royal Air Maroc flight, departing Sun, Dec 28 from London to Washington, returning Sun, Jan 4, priced at $1,382 found 2 days ago
Royal Air Maroc
Fri, Dec 19 - Fri, Jan 2
STN
London
IAD
Washington
$1,408 Roundtrip, found 3 days ago
$1,408
Roundtrip
found 3 days ago
Select Royal Air Maroc flight, departing Fri, Dec 19 from London to Washington, returning Fri, Jan 2, priced at $1,408 found 3 days ago
Royal Air Maroc
Sun, Dec 21 - Fri, Jan 2
STN
London
IAD
Washington
$1,410 Roundtrip, found 1 day ago
$1,410
Roundtrip
found 1 day ago
Select Royal Air Maroc flight, departing Sun, Dec 21 from London to Washington, returning Fri, Jan 2, priced at $1,410 found 1 day ago
Turkish Airlines
Sun, Jul 5 - Sat, Jul 18
STN
London
IAD
Washington
$1,798 Roundtrip, found 4 days ago
$1,798
Roundtrip
found 4 days ago
Select Turkish Airlines flight, departing Sun, Jul 5 from London to Washington, returning Sat, Jul 18, priced at $1,798 found 4 days ago

Frequently asked questions

How much does a flight from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD) cost?
Snag a cheap one-way flight from $572 or cheap return flight from $991 from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD) 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 Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD)?
Traveling in December can help you save, as it's the cheapest month for flights between STN and IAD. You'll often find the lowest prices during off-peak months.
Which airlines fly direct from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD)?
You can't take a direct flight to Washington Dulles Intl. Airport (IAD) from London (STN-Stansted). However, you can easily reach Washington without any layovers by departing from Heathrow Airport (LHR).
What is the cheapest airline that flies from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest STN to IAD flight.
How many flights per day from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD)?
Nonstop flights from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STN to IAD?
You'll generally find Tuesday the quietest day for flights, while Fridays are often 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 Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD)?
Select a flight from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD) that leaves before 3 PM to reduce the risk of cancellations and delays. Departures later than this 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.
Is it cheaper to buy a plane ticket from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD) last-minute?
Holding off until just before your trip to book your flight from STN to IAD often results in higher prices. While you may come across some last-minute deals, they're not always guaranteed. Be flexible with your itinerary to maximize your chances of landing a bargain.
Is it cheaper to book a STN to IAD flight and hotel package?
Compared with arranging flights and hotels separately, booking a STN to IAD flight and hotel package with Expedia could lead to significant savings. Better yet, having it all in one place will take the stress out of planning your trip. Just secure your flights and choose from our wide range of hotels, then tailor your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Stansted Airport (STN) to Washington Dulles Intl. Airport (IAD)?
Generally, it's possible to cancel or reschedule your STN to IAD flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Travel information

Origin airport
Stansted
Destination airport
Washington Dulles Intl.
Roundtrip price
$990
Distance
3686 mi

Book with confidence

Book with confidence

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 December. 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 $572 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.

 

London to Washington Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.