£173 Cheap Flights from Washington (IAD) to London (LON)

View £173 flight on Sun, 14 Sep 2025Opens in a new window

Popular airlines from Washington Dulles International Airport (IAD) to London

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Cheap Flights from Washington (IAD) to London (LON)

Prices were available within the past 7 days and start at £173 for one-way flights and £330 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Thu, 15 Jan - Wed, 28 Jan
IAD
Washington
LGW
London
£330 Return, found 4 days ago
£330
Return
found 4 days ago
Select TAP Portugal flight, departing Thu, 15 Jan from Washington to London, returning Wed, 28 Jan, priced at £330 found 4 days ago
TAP Portugal
Thu, 15 Jan - Wed, 28 Jan
IAD
Washington
LHR
London
£333 Return, found 4 days ago
£333
Return
found 4 days ago
Select TAP Portugal flight, departing Thu, 15 Jan from Washington to London, returning Wed, 28 Jan, priced at £333 found 4 days ago
Aer Lingus
Mon, 4 Aug - Wed, 27 Aug
IAD
Washington
LHR
London
£359 Return, found 1 day ago
£359
Return
found 1 day ago
Select Aer Lingus flight, departing Mon, 4 Aug from Washington to London, returning Wed, 27 Aug, priced at £359 found 1 day ago
United
Sun, 3 Aug - Wed, 20 Aug
IAD
Washington
LHR
London
£374 Return, found 2 days ago
£374
Return
found 2 days ago
Select United flight, departing Sun, 3 Aug from Washington to London, returning Wed, 20 Aug, priced at £374 found 2 days ago
Iberia
Wed, 13 Aug - Thu, 11 Sep
IAD
Washington
LGW
London
£374 Return, found 1 day ago
£374
Return
found 1 day ago
Select Iberia flight, departing Wed, 13 Aug from Washington to London, returning Thu, 11 Sep, priced at £374 found 1 day ago
British Airways
Sun, 14 Sep - Mon, 22 Sep
IAD
Washington
LHR
London
£375 Return, found 1 day ago
£375
Return
found 1 day ago
Select British Airways flight, departing Sun, 14 Sep from Washington to London, returning Mon, 22 Sep, priced at £375 found 1 day ago
Virgin Atlantic
Mon, 1 Dec - Wed, 10 Dec
IAD
Washington
LHR
London
£377 Return, found 1 day ago
£377
Return
found 1 day ago
Select Virgin Atlantic flight, departing Mon, 1 Dec from Washington to London, returning Wed, 10 Dec, priced at £377 found 1 day ago
Virgin Atlantic
Mon, 1 Dec - Wed, 10 Dec
IAD
Washington
LHR
London
£382 Return, found 1 day ago
£382
Return
found 1 day ago
Select Virgin Atlantic flight, departing Mon, 1 Dec from Washington to London, returning Wed, 10 Dec, priced at £382 found 1 day ago
Icelandair
Wed, 3 Dec - Sat, 6 Dec
IAD
Washington
LGW
London
£385 Return, found 6 days ago
£385
Return
found 6 days ago
Select Icelandair flight, departing Wed, 3 Dec from Washington to London, returning Sat, 6 Dec, priced at £385 found 6 days ago
American Airlines
Sat, 23 Aug - Fri, 12 Sep
IAD
Washington
LGW
London
£395 Return, found 2 days ago
£395
Return
found 2 days ago
Select American Airlines flight, departing Sat, 23 Aug from Washington to London, returning Fri, 12 Sep, priced at £395 found 2 days ago

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

March is typically the cheapest month to fly

From £282 - £556 per traveller.

Graph displaying average flight prices per month

Flight from Washington to London route information
Origin airport
Washington Dulles Intl.
Destination airport
Gatwick
Return price
£329
Distance
5896 km

Compare flights from Washington to London easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Washington to London. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to LON-All Airports in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Washington Dulles Intl. to LON-All Airports.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Washington Dulles Intl. (IAD) to LON-All Airports (LON)

The easiest way to view the best deals on flights from Washington to London today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Washington Dulles Intl. to LON-All Airports start at just £330 and range up to £395.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Washington and London
  • booking your flight during January, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Washington to London flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Washington Dulles Intl. to LON-All Airports for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Frequently asked questions

How much is a flight from IAD to London (LON-All Airports)?
If you're travelling from Washington Dulles Intl. Airport (IAD) to London (LON-All Airports), round-trip journeys start from £330. This figure is based on fares listed within the last 7 days on Expedia for flights departing within the next year, so don't let a good deal slip through your fingers. Book today and save yourself money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from IAD to London (LON-All Airports)?
This varies between airlines, as each has its own terms and conditions. Head to the Customer Service Portal, where there are easy-to-follow instructions on how to cancel your flight online.
How do I find cheap flights from Dulles Intl. Airport to London (LON-All Airports) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Dulles Intl. Airport to London (LON-All Airports) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from IAD to London (LON-All Airports)?
The distance is around 5,900 kilometres, so fill your carry-on luggage with whatever you need to make your journey comfortable. Wondering what to take on board your Chantilly to England flight? A travel pillow, earplugs and a sleep mask are among the essentials.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to London (LON-All Airports)?
United Airlines (UA) is the number one choice for many travellers. It offers 60 flights from Dulles Intl. Airport to London (LON-All Airports) each month. If you want more options, check out the fares from British Airways (BA). This airlines operates 60 monthly flights between these airports.
Are Dulles Intl. Airport to London (LON-All Airports) flight tickets cheaper when they're purchased at the last minute?
It is possible to pick up great last-minute deals from IAD to London (LON-All Airports), but it can also be hit-or-miss. As many airlines release seats up to a year in advance, it's worth keeping an eye on fares early and being ready to book when you spot a good bargain. Expedia compares carrier prices and updates flight deals regularly, so you can rest easy knowing you're always getting the latest offers.

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