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£225 Cheap Flights from Washington (IAD) to London (LHR)

View £225 flight on Tue, 2 Mar 2027Opens in a new window

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

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

Prices were available within the past 7 days and start at £225 for one-way flights and £480 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Mon, 18 Jan - Sun, 24 Jan
IAD
Washington
LHR
London
£480 Return, found 4 days ago
£480
Return
found 4 days ago
Select Icelandair flight, departing Mon, 18 Jan from Washington to London, returning Sun, 24 Jan, priced at £480 found 4 days ago
Aer Lingus
Wed, 28 Oct - Thu, 12 Nov
IAD
Washington
LHR
London
£512 Return, just found
£512
Return
just found
Select Aer Lingus flight, departing Wed, 28 Oct from Washington to London, returning Thu, 12 Nov, priced at £512 just found
Iberia
Wed, 18 Nov - Wed, 25 Nov
IAD
Washington
LHR
London
£517 Return, found 22 hours ago
£517
Return
found 22 hours ago
Select Iberia flight, departing Wed, 18 Nov from Washington to London, returning Wed, 25 Nov, priced at £517 found 22 hours ago
United
Tue, 17 Nov - Thu, 26 Nov
IAD
Washington
LHR
London
£528 Return, found 1 day ago
£528
Return
found 1 day ago
Select United flight, departing Tue, 17 Nov from Washington to London, returning Thu, 26 Nov, priced at £528 found 1 day ago
British Airways
Mon, 1 Feb - Thu, 11 Feb
IAD
Washington
LHR
London
£529 Return, found 1 day ago
£529
Return
found 1 day ago
Select British Airways flight, departing Mon, 1 Feb from Washington to London, returning Thu, 11 Feb, priced at £529 found 1 day ago
Air France
Wed, 23 Sept - Wed, 30 Sept
IAD
Washington
LHR
London
£536 Return, found 1 day ago
£536
Return
found 1 day ago
Select Air France flight, departing Wed, 23 Sept from Washington to London, returning Wed, 30 Sept, priced at £536 found 1 day ago
KLM
Tue, 22 Sept - Thu, 1 Oct
IAD
Washington
LHR
London
£536 Return, found 19 hours ago
£536
Return
found 19 hours ago
Select KLM flight, departing Tue, 22 Sept from Washington to London, returning Thu, 1 Oct, priced at £536 found 19 hours ago
Virgin Atlantic
Wed, 30 Sept - Tue, 20 Oct
IAD
Washington
LHR
London
£536 Return, found 19 hours ago
£536
Return
found 19 hours ago
Select Virgin Atlantic flight, departing Wed, 30 Sept from Washington to London, returning Tue, 20 Oct, priced at £536 found 19 hours ago
Delta
Wed, 11 Nov - Wed, 18 Nov
IAD
Washington
LHR
London
£536 Return, found 1 day ago
£536
Return
found 1 day ago
Select Delta flight, departing Wed, 11 Nov from Washington to London, returning Wed, 18 Nov, priced at £536 found 1 day ago
Finnair
Tue, 17 Nov - Thu, 26 Nov
IAD
Washington
LHR
London
£541 Return, found 1 day ago
£541
Return
found 1 day ago
Select Finnair flight, departing Tue, 17 Nov from Washington to London, returning Thu, 26 Nov, priced at £541 found 1 day ago

Alternative airports near London

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

Select flight to Gatwick LGW. Average driving time to city centre is 52 minutes. Flights from £561
LGW
Gatwick
Average driving time to city centre52 min
Flights from £561
Select flight to London City LCY. Closest option available. Average driving time to city centre is 21 minutes. Flights from £895
LCY
London City
Closest
Average driving time to city centre21 min
Flights from £895

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

November is typically the cheapest month to fly

From £476 - £619 per traveller.

Frequently asked questions

How much does a flight from Washington, DC (IAD) to London (LHR) cost?
You can find one-way and return flights from Washington, DC (IAD) to London (LHR) with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when IAD to LHR ticket fares go up or down.
What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow)?
February is typically the cheapest month to fly from Washington Dulles Intl. (IAD) to London Heathrow (LHR), with average return fares around £490. February often sees lower prices because it falls after the busy holiday season, when travel demand tends to decrease, leading airlines to offer more competitive fares. Other cheap months to fly from Washington Dulles Intl. (IAD) to London Heathrow (LHR) include September and October.
Which airlines fly direct from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow)?
You have 3 airlines offering direct flights from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow). Here are the carriers:
  • British Airways operates 22 direct flights from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) every week.
  • United operates 14 direct flights from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) every week.
  • Virgin Atlantic operates 7 direct flights from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) every week.
How do I find cheap flights from Washington, DC (IAD) to London (LHR)?
To find a cheap flight from Washington, DC (IAD) to London (LHR), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Washington, DC (IAD) to London (LHR)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow)?
The earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) typically departs around 5:00 AM. This service is operated by American Airlines. This is a seasonal service, active in February and March. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
How long does it take to fly from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow)?
A non-stop flight from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) typically takes around 7 hours 30 minutes. This route covers a distance of approximately 5,901 kilometers. If you opt for a flight with one stop, your journey will usually be longer, taking about 12 hours 48 minutes. Flights with two or more stops will extend your travel time even further, to around 15 hours 30 minutes. Keep in mind that actual flight times can vary due to factors like wind patterns and specific routing.
Can you fly business or first class from Washington, DC (IAD) to London (LHR)?
Select the "Business class" and "First class" filters when looking for Washington, DC (IAD) to London (LHR) flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How much is a business class flight from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow)?
A direct, return business class ticket from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) typically costs between £7,309 - £12,063. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) if you opt for a connecting flight.
How do I earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) flight with Expedia?
It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for London (LHR) from Washington, DC (IAD)?
If you're planning to travel to London from Washington Dulles Intl. (IAD), you can fly directly into Heathrow (LHR). Some flights may connect through major hubs like Dublin (DUB), Charlotte-Douglas Intl. (CLT), or Liberty Intl. (EWR) before reaching London. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) at the last minute?
Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) flight and hotel package?
Securing a Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington, DC (IAD) to London (LHR)?
If you booked your Washington, DC (IAD) to London (LHR) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, ITA Airways, Iberia, Icelandair, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Return price
£480
Distance
5866 km
Average flight time
12 hours 28 mins

Book with confidence

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 Heathrow in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Washington Dulles Intl. to Heathrow.  

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 Heathrow (LHR)

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 Heathrow start at just £480 and range up to £541.  

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 Heathrow 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.  

Compare flights from Washington to London easily and book with confidence

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*Available to Expedia members.