S$498 Cheap Flights from Washington to London

View S$498 flight on Wed, 1 Apr, 2026Opens 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$498 for one-way flights and S$795 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, 27 Feb - Sat, 7 Mar
IAD
Washington
LHR
London
S$795 Return, found 2 days ago
S$795
Return
found 2 days ago
Select United flight, departing Fri, 27 Feb from Washington to London, returning Sat, 7 Mar, priced at S$795 found 2 days ago
United
Fri, 27 Feb - Sat, 7 Mar
IAD
Washington
LHR
London
S$795 Return, found 2 days ago
S$795
Return
found 2 days ago
Select United flight, departing Fri, 27 Feb from Washington to London, returning Sat, 7 Mar, priced at S$795 found 2 days ago
Scandinavian Airlines
Thu, 5 Feb - Sat, 14 Feb
IAD
Washington
LHR
London
S$797 Return, found 3 days ago
S$797
Return
found 3 days ago
Select Scandinavian Airlines flight, departing Thu, 5 Feb from Washington to London, returning Sat, 14 Feb, priced at S$797 found 3 days ago
Scandinavian Airlines
Thu, 5 Feb - Sat, 14 Feb
IAD
Washington
LHR
London
S$802 Return, found 3 days ago
S$802
Return
found 3 days ago
Select Scandinavian Airlines flight, departing Thu, 5 Feb from Washington to London, returning Sat, 14 Feb, priced at S$802 found 3 days ago
Air Canada
Fri, 27 Feb - Sat, 7 Mar
IAD
Washington
LHR
London
S$803 Return, found 2 days ago
S$803
Return
found 2 days ago
Select Air Canada flight, departing Fri, 27 Feb from Washington to London, returning Sat, 7 Mar, priced at S$803 found 2 days ago
Air Canada
Fri, 27 Feb - Sat, 7 Mar
IAD
Washington
LHR
London
S$804 Return, found 2 days ago
S$804
Return
found 2 days ago
Select Air Canada flight, departing Fri, 27 Feb from Washington to London, returning Sat, 7 Mar, priced at S$804 found 2 days ago
Scandinavian Airlines
Thu, 5 Feb - Sat, 14 Feb
IAD
Washington
LHR
London
S$806 Return, found 3 days ago
S$806
Return
found 3 days ago
Select Scandinavian Airlines flight, departing Thu, 5 Feb from Washington to London, returning Sat, 14 Feb, priced at S$806 found 3 days ago
United
Fri, 27 Feb - Sat, 7 Mar
IAD
Washington
LHR
London
S$813 Return, found 2 days ago
S$813
Return
found 2 days ago
Select United flight, departing Fri, 27 Feb from Washington to London, returning Sat, 7 Mar, priced at S$813 found 2 days ago
Brussels Airlines
Fri, 27 Feb - Sat, 7 Mar
IAD
Washington
LHR
London
S$827 Return, found 2 days ago
S$827
Return
found 2 days ago
Select Brussels Airlines flight, departing Fri, 27 Feb from Washington to London, returning Sat, 7 Mar, priced at S$827 found 2 days ago
Delta
Fri, 27 Feb - Sat, 7 Mar
IAD
Washington
LHR
London
S$832 Return, found 2 days ago
S$832
Return
found 2 days ago
Select Delta flight, departing Fri, 27 Feb from Washington to London, returning Sat, 7 Mar, priced at S$832 found 2 days ago

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

March is typically the cheapest month to fly

From S$562 - S$1,048 per traveller.

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$795. 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.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Return price
S$794
Distance
5866 km

Book with confidence

Perfect flights from Washington to London

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*Note: Prices may vary based on availability and are subject to change.
Perfect flights from Washington to London

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