S$917 Cheap Flights from London to Washington

View S$917 flight on Fri, 29 Aug, 2025Opens in a new window

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

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Cheap Flights from London to Washington (LHR-IAD)

Prices were available within the past 7 days and start at S$917 for one-way flights and S$645 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Tue, 26 Aug - Sun, 14 Sep
LHR
London
IAD
Washington
S$645 Return, found 4 days ago
S$645
Return
found 4 days ago
Select TAP Portugal flight, departing Tue, 26 Aug from London to Washington, returning Sun, 14 Sep, priced at S$645 found 4 days ago
Icelandair
Fri, 12 Sep - Fri, 3 Oct
LHR
London
IAD
Washington
S$728 Return, found 4 days ago
S$728
Return
found 4 days ago
Select Icelandair flight, departing Fri, 12 Sep from London to Washington, returning Fri, 3 Oct, priced at S$728 found 4 days ago
Virgin Atlantic
Fri, 31 Oct - Sat, 8 Nov
LHR
London
IAD
Washington
S$792 Return, found 2 days ago
S$792
Return
found 2 days ago
Select Virgin Atlantic flight, departing Fri, 31 Oct from London to Washington, returning Sat, 8 Nov, priced at S$792 found 2 days ago
Delta
Sun, 21 Sep - Tue, 30 Sep
LHR
London
IAD
Washington
S$792 Return, found 2 days ago
S$792
Return
found 2 days ago
Select Delta flight, departing Sun, 21 Sep from London to Washington, returning Tue, 30 Sep, priced at S$792 found 2 days ago
United
Thu, 25 Sep - Sun, 28 Sep
LHR
London
IAD
Washington
S$794 Return, found 5 days ago
S$794
Return
found 5 days ago
Select United flight, departing Thu, 25 Sep from London to Washington, returning Sun, 28 Sep, priced at S$794 found 5 days ago
Delta
Wed, 24 Sep - Wed, 1 Oct
LHR
London
IAD
Washington
S$796 Return, found 4 days ago
S$796
Return
found 4 days ago
Select Delta flight, departing Wed, 24 Sep from London to Washington, returning Wed, 1 Oct, priced at S$796 found 4 days ago
American Airlines
Thu, 20 Nov - Mon, 1 Dec
LHR
London
IAD
Washington
S$804 Return, found 4 days ago
S$804
Return
found 4 days ago
Select American Airlines flight, departing Thu, 20 Nov from London to Washington, returning Mon, 1 Dec, priced at S$804 found 4 days ago
Swiss International Air Lines
Thu, 25 Sep - Sun, 28 Sep
LHR
London
IAD
Washington
S$820 Return, found 5 days ago
S$820
Return
found 5 days ago
Select Swiss International Air Lines flight, departing Thu, 25 Sep from London to Washington, returning Sun, 28 Sep, priced at S$820 found 5 days ago
Austrian Airlines
Thu, 25 Sep - Sun, 28 Sep
LHR
London
IAD
Washington
S$821 Return, found 5 days ago
S$821
Return
found 5 days ago
Select Austrian Airlines flight, departing Thu, 25 Sep from London to Washington, returning Sun, 28 Sep, priced at S$821 found 5 days ago
Lufthansa
Thu, 25 Sep - Sun, 28 Sep
LHR
London
IAD
Washington
S$824 Return, found 5 days ago
S$824
Return
found 5 days ago
Select Lufthansa flight, departing Thu, 25 Sep from London to Washington, returning Sun, 28 Sep, priced at S$824 found 5 days ago

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

October is typically the cheapest month to fly

From S$603 - S$987 per traveller.

Graph displaying average flight prices per month

London to Washington route information
Origin airport
Heathrow
Destination airport
Washington Dulles Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Delta, Finnair, Iberia, KLM, Lufthansa, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic
Return price
S$644
Distance
5866 km
Average flight time
3 hours 15 mins

Perfect flights from London to Washington

Your Journey from London to Washington

Start your unforgettable journey with Expedia. Our broad selection of flights from London to Washington caters to every travel need. Whether you're yearning for a romantic escape, a solo adventure, or a cultural immersion, we've got you covered.
 

Choosing Your Ideal Flight

With Expedia, you have access to a wide range of airlines, including TAP Portugal, Icelandair, Virgin Atlantic, Delta, United, American Airlines, Swiss International Air Lines, Austrian Airlines, Lufthansa, Royal Air Maroc, avianca, Iberia. Our selection of flights from Heathrow to Washington Dulles Intl. caters to every traveler's requirements, ensuring your journey aligns with your schedule. With options from 20 airlines, you're bound to find the perfect flight.
 

Maximizing Value with London to Washington Flights

Experience the joy of finding cheap flights from Heathrow to Washington Dulles Intl. that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$917 and roundtrip prices from S$645*.
 

Pre-Flight Essentials

Ensure a smooth journey from London to Washington with Expedia. From information about check-in times and in-flight amenities to guidance on baggage policies, we provide all the essentials to prepare you for your flight.
 

Experience the Vibrant Washington

Picture yourself stepping off the plane in Washington and immersing yourself in the unique atmosphere of Chantilly. From local markets to cultural festivals, each city offers its distinct charm. Make the most of your trip by exploring local attractions and indulging in the local cuisine. With Expedia, explore all this and more, tailored to your budget.
 

Added Convenience on Your London to Washington Flight

Traveling with Expedia is more than just a flight. We offer details about in-flight amenities, baggage policies, and more to ensure a smooth and hassle-free journey. Choose from our variety of airlines and embark on a memorable journey from London to Washington.
 

Beyond the Flight – Exploring Washington

With Expedia, your adventure extends beyond the flight. Explore Washington at your own pace by renting a car or booking a hotel. Discover hidden gems off the beaten path and create unforgettable memories.
 

Book Your Flight from London to Washington with Confidence

Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support make your travel experience seamless and stress-free. Embark on your journey from London to Washington with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.

Frequently asked questions

How much is a flight from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
Within the past 7 days on Expedia, for flights departing within the next year, the lowest price advertised for a round-trip journey between London Heathrow and Dulles Intl. Airport was S$645. Fares this cheap don't wait forever, so make sure you book yours ASAP. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from LHR to Dulles Intl. Airport?
This can differ from airline to airline, as each has its own terms and conditions. Visit the Customer Service Portal, where you'll find easy instructions on how to cancel your flight online.
How do I find cheap flights from London Heathrow to IAD 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 Heathrow Airport to Dulles Intl. Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Heathrow Airport (LHR) to Dulles Intl. Airport?
With around 5,900 kilometres separating Heathrow Airport and IAD, your flight will be a long one. Pack wisely to make your time on board comfortable. Simple things like warm clothes and some noise-cancelling headphones can make the biggest difference.
Which airlines fly direct from LHR to Dulles Intl. Airport?
United Airlines (UA) is a popular choice. It offers 60 flights between LHR and Washington Dulles Intl. Airport (IAD) each month. You could also have a look at the airfares with British Airways (BA). This airline operates 60 flights every month between Hounslow and Chantilly.
Are London Heathrow to IAD flight tickets cheaper when they're purchased at the last minute?
Flight prices fluctuate, so not always. While last-minute deals between LHR and Washington Dulles Intl. Airport (IAD) are of course possible, it's also a good idea to keep a close eye on prices well before you fly. In fact, some air carriers publish their prices up to a year ahead of the departure date. Expedia is constantly updating the best bargains around, so check back often and be ready to grab your seat when fare prices drop.

Explore a world of travel with Expedia

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