£401 Cheap Flights from London (LHR) to Washington (IAD)

View £401 flight on Mon, 23 Nov 2026Opens in a new window

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

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 25% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

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

Prices were available within the past 7 days and start at £401 for one-way flights and £459 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Mon, 11 Jan - Fri, 15 Jan
LHR
London
IAD
Washington
£459 Return, found 3 days ago
£459
Return
found 3 days ago
Select Icelandair flight, departing Mon, 11 Jan from London to Washington, returning Fri, 15 Jan, priced at £459 found 3 days ago
Virgin Atlantic
Thu, 24 Sept - Thu, 1 Oct
LHR
London
IAD
Washington
£496 Return, found 5 days ago
£496
Return
found 5 days ago
Select Virgin Atlantic flight, departing Thu, 24 Sept from London to Washington, returning Thu, 1 Oct, priced at £496 found 5 days ago
KLM
Thu, 24 Sept - Thu, 1 Oct
LHR
London
IAD
Washington
£496 Return, found 5 days ago
£496
Return
found 5 days ago
Select KLM flight, departing Thu, 24 Sept from London to Washington, returning Thu, 1 Oct, priced at £496 found 5 days ago
Delta
Thu, 24 Sept - Thu, 1 Oct
LHR
London
IAD
Washington
£496 Return, found 5 days ago
£496
Return
found 5 days ago
Select Delta flight, departing Thu, 24 Sept from London to Washington, returning Thu, 1 Oct, priced at £496 found 5 days ago
British Airways
Tue, 29 Sept - Thu, 15 Oct
LHR
London
IAD
Washington
£497 Return, found 23 hours ago
£497
Return
found 23 hours ago
Select British Airways flight, departing Tue, 29 Sept from London to Washington, returning Thu, 15 Oct, priced at £497 found 23 hours ago
Iberia
Wed, 18 Nov - Mon, 23 Nov
LHR
London
IAD
Washington
£500 Return, found 4 hours ago
£500
Return
found 4 hours ago
Select Iberia flight, departing Wed, 18 Nov from London to Washington, returning Mon, 23 Nov, priced at £500 found 4 hours ago
Air France
Thu, 24 Sept - Thu, 1 Oct
LHR
London
IAD
Washington
£501 Return, found 5 days ago
£501
Return
found 5 days ago
Select Air France flight, departing Thu, 24 Sept from London to Washington, returning Thu, 1 Oct, priced at £501 found 5 days ago
American Airlines
Mon, 28 Sept - Thu, 15 Oct
LHR
London
IAD
Washington
£502 Return, found 4 days ago
£502
Return
found 4 days ago
Select American Airlines flight, departing Mon, 28 Sept from London to Washington, returning Thu, 15 Oct, priced at £502 found 4 days ago
Swiss International Air Lines
Sun, 15 Nov - Sun, 29 Nov
LHR
London
IAD
Washington
£508 Return, found 2 days ago
£508
Return
found 2 days ago
Select Swiss International Air Lines flight, departing Sun, 15 Nov from London to Washington, returning Sun, 29 Nov, priced at £508 found 2 days ago
Austrian Airlines
Thu, 3 Sept - Mon, 14 Sept
LHR
London
IAD
Washington
£510 Return, just found
£510
Return
just found
Select Austrian Airlines flight, departing Thu, 3 Sept from London to Washington, returning Mon, 14 Sept, priced at £510 just found

Alternative airports near Washington

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

Select flight to Ronald Reagan Washington National DCA. Closest option available. Average driving time to city centre is 8 minutes. Flights from £684
DCA
Ronald Reagan Washington National
Closest
Average driving time to city centre8 min
Flights from £684

Frequently asked questions

How much does a flight from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.) cost?
One-way flights typically cost between £497 and £3,110 and return flights often range between £532 and £4,517. 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 the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.
What is the cheapest month to fly from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
September is typically the cheapest month to fly from London Heathrow (LHR) to Washington Dulles Intl. (IAD), with average return fares of approximately £469. This is about 26% lower than the average price throughout the year. September often sees lower prices as the peak summer travel season ends and demand decreases. Other cheap months to fly from London Heathrow (LHR) to Washington Dulles Intl. (IAD) include February and October.
Which airlines fly direct from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
Enter LHR to IAD and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
To find a cheap flight from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.), 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 airline to fly with from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
The best airline to fly with from London Heathrow (LHR) to Washington, DC (IAD) will differ from traveller to traveller. If you like to fly early, UA offers early morning flights. If price is the most important factor, VS typically offers the lowest fares. BA offers the most daily flights from London Heathrow (LHR) to Washington, DC (IAD), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
Based on booking data from the past year, the best time to fly from London Heathrow (LHR) to Washington, DC (IAD) for a good balance of price and availability is typically September or October. These months offer the cheapest average prices for a return flight, around £469. While May and July are the most popular months for travel, September and October provide a great opportunity to find more affordable fares while still having plenty of flight options available.
How many flights per day from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
There are approximately 6 nonstop flights per day from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.). For even more choice, look at flights that include layovers, as there are around 187 connecting flights per day. Some common connection points include Unknown (DUB), John F. Kennedy Intl. (JFK), and Schiphol (AMS).
What is the earliest flight from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
The earliest flight from London Heathrow (LHR) to Washington Dulles Intl. (IAD) typically departs at approximately 6:00 AM local time. This service is operated by BT and LX. This is a seasonal service active in March, April, May, June, July, August, and September. An early departure like this can help maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
You'll find the most flights from London Heathrow (LHR) to Washington Dulles Intl. (IAD) on a Thursday, with around 111 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include British Airways, United Airlines, and Lufthansa.
What are the most popular departure times for flights from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
The most popular departure times for flights from London Heathrow (LHR) to Washington, DC (IAD) are in the morning, from 6am to 9am. About 39% of passengers prefer this time. Many major carriers, including Lufthansa, United Airlines and SWISS, offer flights during this window. This timing works well because it allows you to start your journey early and arrive in Washington, DC with plenty of time to settle in.
How long does it take to fly from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
Flying nonstop from LHR to IAD takes around 8 hours 20 minutes, with the route covering approximately 3,667 miles. Flights with a layover typically take 4 hours 10 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
Select the "Business class" and "First class" filters when looking for LHR to IAD 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 London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
A direct, return business class ticket from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.) typically costs between £12,229 - £14,372. You may also be able to find a cheaper business class journey between London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Anaa (AAA) (AAA) to Toronto, ON (YYZ-Pearson Intl.) (YYZ) if you opt for a connecting flight.
How do I earn miles on a London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.) flight with Expedia?
It's easy to earn miles on a London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.) 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 Washington from Heathrow (LHR)?
From Heathrow (LHR), you can fly into Washington Dulles Intl. (IAD) and Ronald Reagan Washington National (DCA) in Washington. Some flights may connect through major hubs like Humberto Delgado (LIS), Arlanda (ARN), Logan Intl. (BOS) before reaching Washington. 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 London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.) at the last minute?
Typically, booking a last minute flight from London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.) 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 London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.) flight and hotel package?
Securing a London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.) 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 London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.)?
If you booked your London (LHR-Heathrow) to Washington, DC (IAD-Washington Dulles Intl.) 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
Heathrow
Destination airport
Washington Dulles Intl.
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
£459
Distance
5866 km
Average flight time
3 hours 11 mins

Book with confidence

Compare flights from London to Washington easily and book with confidence

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

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 Heathrow (LHR) to Washington Dulles Intl. (IAD)

The easiest way to view the best deals on flights from London to Washington 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 Heathrow to Washington Dulles Intl. start at just £459 and range up to £510.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near London and Washington
  • 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 London to Washington flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Heathrow to Washington Dulles Intl. 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 London to Washington easily and book with confidence

Explore a world of travel with Expedia

*Available to Expedia members.