S$496 Cheap Flights from Washington to London

View S$496 flight on Tue, 13 Jan, 2026Opens in a new window

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

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Cheap Flights from Washington to London (IAD-LHR)

Prices were available within the past 7 days and start at S$496 for one-way flights and S$815 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, 18 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
S$815 Return, found 1 day ago
S$815
Return
found 1 day ago
Select United flight, departing Sun, 18 Jan from Washington to London, returning Tue, 27 Jan, priced at S$815 found 1 day ago
United
Sun, 14 Dec - Thu, 25 Dec
IAD
Washington
LHR
London
S$834 Return, found 3 days ago
S$834
Return
found 3 days ago
Select United flight, departing Sun, 14 Dec from Washington to London, returning Thu, 25 Dec, priced at S$834 found 3 days ago
Delta
Sun, 18 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
S$835 Return, found 1 day ago
S$835
Return
found 1 day ago
Select Delta flight, departing Sun, 18 Jan from Washington to London, returning Tue, 27 Jan, priced at S$835 found 1 day ago
Delta
Sun, 14 Dec - Wed, 24 Dec
IAD
Washington
LHR
London
S$836 Return, found 3 days ago
S$836
Return
found 3 days ago
Select Delta flight, departing Sun, 14 Dec from Washington to London, returning Wed, 24 Dec, priced at S$836 found 3 days ago
United
Sun, 18 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
S$836 Return, found 1 day ago
S$836
Return
found 1 day ago
Select United flight, departing Sun, 18 Jan from Washington to London, returning Tue, 27 Jan, priced at S$836 found 1 day ago
Delta
Sun, 18 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
S$840 Return, found 1 day ago
S$840
Return
found 1 day ago
Select Delta flight, departing Sun, 18 Jan from Washington to London, returning Tue, 27 Jan, priced at S$840 found 1 day ago
Virgin Atlantic
Sun, 18 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
S$843 Return, found 1 day ago
S$843
Return
found 1 day ago
Select Virgin Atlantic flight, departing Sun, 18 Jan from Washington to London, returning Tue, 27 Jan, priced at S$843 found 1 day ago
Swiss International Air Lines
Mon, 15 Dec - Tue, 23 Dec
IAD
Washington
LHR
London
S$871 Return, found 3 days ago
S$871
Return
found 3 days ago
Select Swiss International Air Lines flight, departing Mon, 15 Dec from Washington to London, returning Tue, 23 Dec, priced at S$871 found 3 days ago
Austrian Airlines
Sun, 18 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
S$877 Return, found 1 day ago
S$877
Return
found 1 day ago
Select Austrian Airlines flight, departing Sun, 18 Jan from Washington to London, returning Tue, 27 Jan, priced at S$877 found 1 day ago
Air France
Sun, 18 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
S$879 Return, found 1 day ago
S$879
Return
found 1 day ago
Select Air France flight, departing Sun, 18 Jan from Washington to London, returning Tue, 27 Jan, priced at S$879 found 1 day ago

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

November is typically the cheapest month to fly

From S$578 - S$1,038 per traveller.
Washington to London route information
Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Delta, Finnair, Iberia, KLM, Lufthansa, Royal Air Maroc, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic, avianca
Return price
S$815
Distance
5866 km
Average flight time
12 hours 20 mins

Perfect flights from Washington to London

Your Journey from Washington to London

Start your unforgettable journey with Expedia. Our broad selection of flights from Washington to London 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 United, Virgin Atlantic, Delta, Air Canada, British Airways, KLM, Swiss International Air Lines, Austrian Airlines, Air France. Our selection of flights from Washington Dulles Intl. to Heathrow 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 Washington to London Flights

Experience the joy of finding cheap flights from Washington Dulles Intl. to Heathrow that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$496 and roundtrip prices from S$815*.
 

Pre-Flight Essentials

Ensure a smooth journey from Washington to London 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 London

Picture yourself stepping off the plane in London and immersing yourself in the unique atmosphere of London. 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 Washington to London 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 Washington to London.
 

Beyond the Flight – Exploring London

With Expedia, your adventure extends beyond the flight. Explore London 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 Washington to London 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 Washington to London 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 Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
Start packing your suitcase, because round-trip journeys from IAD to London Heathrow start from S$815. That's based on airfares listed within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book today to nab the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Dulles Intl. Airport to Heathrow Airport?
We understand that things come up unexpectedly, so we've made it as easy as possible for you to cancel your trip online. Just head to the Customer Service Portal and follow the instructions.
How do I find cheap flights from Dulles Intl. Airport to Heathrow Airport (LHR) 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 IAD to Heathrow Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Dulles Intl. Airport to LHR?
You'll have 5,900 kilometres to cover on the long-haul Chantilly to Hounslow route. Dress in layers of comfortable clothes and consider taking a sleep mask and earplugs.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to Heathrow Airport?
With 60 flights a month from Dulles Intl. Airport to LHR, United Airlines (UA) is an excellent choice. Another carrier operating on this route is British Airways (BA). You'll have 60 flights every month to choose from.
Are IAD to LHR flight tickets cheaper when they're purchased at the last minute?
Booking your trip from IAD to London Heathrow at the last minute could be your ticket to a great deal. However, it could end up costing a great deal more! If you'd prefer to err on the side of caution, book well ahead of your departure date. In fact, Expedia has some of the biggest bargains up to a year in advance. If your preferred carrier hasn't released tickets yet, check back regularly as deals are updated on Expedia all the time.

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