S$297 Cheap Flights from Washington to London

View S$297 flight on Sun, 28 Sep, 2025Opens in a new window

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

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Cheap Flights from Washington to London (IAD-LON)

Prices were available within the past 7 days and start at S$297 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 5 days ago
S$780
Return
found 5 days ago
Select Scandinavian Airlines flight, departing Mon, 24 Nov from Washington to London, returning Mon, 8 Dec, priced at S$780 found 5 days ago
United
Wed, 15 Oct - Fri, 7 Nov
IAD
Washington
LHR
London
S$796 Return, found 5 days ago
S$796
Return
found 5 days ago
Select United flight, departing Wed, 15 Oct from Washington to London, returning Fri, 7 Nov, priced at S$796 found 5 days ago
United
Wed, 3 Dec - Tue, 9 Dec
IAD
Washington
LHR
London
S$799 Return, found 10 hours ago
S$799
Return
found 10 hours ago
Select United flight, departing Wed, 3 Dec from Washington to London, returning Tue, 9 Dec, priced at S$799 found 10 hours ago
United
Tue, 7 Oct - Tue, 14 Oct
IAD
Washington
LHR
London
S$800 Return, found 5 days ago
S$800
Return
found 5 days ago
Select United flight, departing Tue, 7 Oct from Washington to London, returning Tue, 14 Oct, priced at S$800 found 5 days ago
United
Mon, 26 Jan - Fri, 13 Feb
IAD
Washington
LHR
London
S$804 Return, found 5 days ago
S$804
Return
found 5 days ago
Select United flight, departing Mon, 26 Jan from Washington to London, returning Fri, 13 Feb, priced at S$804 found 5 days ago
Delta
Wed, 3 Dec - Tue, 9 Dec
IAD
Washington
LHR
London
S$819 Return, found 10 hours ago
S$819
Return
found 10 hours ago
Select Delta flight, departing Wed, 3 Dec from Washington to London, returning Tue, 9 Dec, priced at S$819 found 10 hours ago
Virgin Atlantic
Wed, 3 Dec - Tue, 9 Dec
IAD
Washington
LHR
London
S$819 Return, found 10 hours ago
S$819
Return
found 10 hours ago
Select Virgin Atlantic flight, departing Wed, 3 Dec from Washington to London, returning Tue, 9 Dec, priced at S$819 found 10 hours ago
Air Canada
Tue, 7 Oct - Tue, 14 Oct
IAD
Washington
LHR
London
S$828 Return, found 5 days ago
S$828
Return
found 5 days ago
Select Air Canada flight, departing Tue, 7 Oct from Washington to London, returning Tue, 14 Oct, priced at S$828 found 5 days ago
British Airways
Wed, 3 Dec - Tue, 9 Dec
IAD
Washington
LHR
London
S$855 Return, found 10 hours ago
S$855
Return
found 10 hours ago
Select British Airways flight, departing Wed, 3 Dec from Washington to London, returning Tue, 9 Dec, priced at S$855 found 10 hours ago
Lufthansa
Wed, 3 Dec - Tue, 9 Dec
IAD
Washington
LHR
London
S$866 Return, found 10 hours ago
S$866
Return
found 10 hours ago
Select Lufthansa flight, departing Wed, 3 Dec from Washington to London, returning Tue, 9 Dec, priced at S$866 found 10 hours ago

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

March is typically the cheapest month to fly

From S$485 - S$989 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

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 TAP Portugal, Virgin Atlantic, Delta, United, Air Canada, British Airways, Air France, KLM, Scandinavian Airlines, Lufthansa. Our selection of flights from Washington Dulles Intl. to LON-All Airports 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 LON-All Airports that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$297 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 IAD to London (LON-All Airports)?
If you're travelling from Washington Dulles Intl. Airport (IAD) to London (LON-All Airports), round-trip journeys start from S$780. This figure is based on fares listed within the last 7 days on Expedia for flights departing within the next year, so don't let a good deal slip through your fingers. Book today and save yourself money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from IAD to London (LON-All Airports)?
This varies between airlines, as each has its own terms and conditions. Head to the Customer Service Portal, where there are easy-to-follow instructions on how to cancel your flight online.
How do I find cheap flights from Dulles Intl. Airport to London (LON-All Airports) 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 Dulles Intl. Airport to London (LON-All Airports) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from IAD to London (LON-All Airports)?
The distance is around 5,900 kilometres, so fill your carry-on luggage with whatever you need to make your journey comfortable. Wondering what to take on board your Chantilly to England flight? A travel pillow, earplugs and a sleep mask are among the essentials.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to London (LON-All Airports)?
United Airlines (UA) is the number one choice for many travellers. It offers 60 flights from Dulles Intl. Airport to London (LON-All Airports) each month. If you want more options, check out the fares from British Airways (BA). This airlines operates 60 monthly flights between these airports.
Are Dulles Intl. Airport to London (LON-All Airports) flight tickets cheaper when they're purchased at the last minute?
It is possible to pick up great last-minute deals from IAD to London (LON-All Airports), but it can also be hit-or-miss. As many airlines release seats up to a year in advance, it's worth keeping an eye on fares early and being ready to book when you spot a good bargain. Expedia compares carrier prices and updates flight deals regularly, so you can rest easy knowing you're always getting the latest offers.

Explore a world of travel with Expedia

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*Available to Expedia members.