S$494 Cheap Flights from Washington to London

View S$494 flight on Wed, 1 Oct, 2025Opens 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$494 for one-way flights and S$780 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Mon, 24 Nov - Mon, 8 Dec
IAD
Washington
LHR
London
S$780 Return, found 7 hours ago
S$780
Return
found 7 hours ago
Select Scandinavian Airlines flight, departing Mon, 24 Nov from Washington to London, returning Mon, 8 Dec, priced at S$780 found 7 hours ago
United
Mon, 29 Sep - Mon, 6 Oct
IAD
Washington
LHR
London
S$795 Return, found 5 days ago
S$795
Return
found 5 days ago
Select United flight, departing Mon, 29 Sep from Washington to London, returning Mon, 6 Oct, priced at S$795 found 5 days ago
United
Wed, 15 Oct - Fri, 7 Nov
IAD
Washington
LHR
London
S$796 Return, found 7 hours ago
S$796
Return
found 7 hours ago
Select United flight, departing Wed, 15 Oct from Washington to London, returning Fri, 7 Nov, priced at S$796 found 7 hours ago
United
Mon, 1 Sep - Tue, 9 Sep
IAD
Washington
LHR
London
S$799 Return, found 5 days ago
S$799
Return
found 5 days ago
Select United flight, departing Mon, 1 Sep from Washington to London, returning Tue, 9 Sep, priced at S$799 found 5 days ago
United
Tue, 7 Oct - Tue, 14 Oct
IAD
Washington
LHR
London
S$800 Return, just found
S$800
Return
just found
Select United flight, departing Tue, 7 Oct from Washington to London, returning Tue, 14 Oct, priced at S$800 just found
Delta
Mon, 1 Sep - Tue, 9 Sep
IAD
Washington
LHR
London
S$819 Return, found 5 days ago
S$819
Return
found 5 days ago
Select Delta flight, departing Mon, 1 Sep from Washington to London, returning Tue, 9 Sep, priced at S$819 found 5 days ago
Virgin Atlantic
Mon, 1 Sep - Tue, 9 Sep
IAD
Washington
LHR
London
S$819 Return, found 5 days ago
S$819
Return
found 5 days ago
Select Virgin Atlantic flight, departing Mon, 1 Sep from Washington to London, returning Tue, 9 Sep, priced at S$819 found 5 days ago
Air Canada
Tue, 7 Oct - Tue, 14 Oct
IAD
Washington
LHR
London
S$828 Return, just found
S$828
Return
just found
Select Air Canada flight, departing Tue, 7 Oct from Washington to London, returning Tue, 14 Oct, priced at S$828 just found
Swiss International Air Lines
Mon, 29 Sep - Mon, 6 Oct
IAD
Washington
LHR
London
S$852 Return, found 5 days ago
S$852
Return
found 5 days ago
Select Swiss International Air Lines flight, departing Mon, 29 Sep from Washington to London, returning Mon, 6 Oct, priced at S$852 found 5 days ago
British Airways
Tue, 7 Oct - Tue, 14 Oct
IAD
Washington
LHR
London
S$856 Return, just found
S$856
Return
just found
Select British Airways flight, departing Tue, 7 Oct from Washington to London, returning Tue, 14 Oct, priced at S$856 just found

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

October is typically the cheapest month to fly

From S$574 - S$1,060 per traveller.

Graph displaying average flight prices per month

Washington to London route information
Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Return price
S$780
Distance
5866 km
Average flight time
12 hours 22 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 Virgin Atlantic, United, Delta, Air Canada, British Airways, Scandinavian Airlines, Swiss International Air Lines. 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$494 and roundtrip prices from S$780*.
 

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 . 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$780. 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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