Cheap flights from London to Washington Dulles Intl

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The best prices from London to Washington Dulles Intl are usually found in February or March, booked 45 days in advance, depart on a Thursday or Wednesday and return on a Sunday

How to find the cheapest flight from
London (LON) to Washington Dulles Intl (IAD)

LON - IAD
Price
£433 - £624
IAD
Temperature
8 - 31 °C
IAD
Rainfall
64 - 113 mm

Popular in

August

High demand for flights, 18% potential price rise

Cheapest in

February

Best time to find cheap flights, 15% potential price drop

Round-trip from

£433

From London to Washington Dulles Intl

One-way from

£153

One-way flight from London to Washington Dulles Intl

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly return from London to Washington Dulles Intl?

Saturday flights are generally found to be more expensive for flights from London to Washington Dulles Intl. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Washington Dulles Intl.

How far in advance should I book a flight from London to Washington Dulles Intl?

Travellers have found it’s best to book a flight 34 days in advance to save up to 27% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 34 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London to Washington Dulles Intl 1-2 weeks in advance for as low as £547, or £639 for flights within the next 24 hours.

What is the cheapest month to fly from London to Washington Dulles Intl?

February can be a great time to fly to Washington Dulles Intl from London with a flight ticket averaging about £501. Cheapflights users have found deals in the month of February for as cheap as £335. The most expensive prices can be found in the month of July.

When is the cheapest time to fly from London to Washington Dulles Intl (LON - IAD)?

It’s optimal to fly from London to Washington Dulles Intl in the evening. By choosing this option you can save up to 5% on the cost of your flight, compared to a flight in the morning.

Cheap flights from London to Washington Dulles Intl in December, January 2021

The best prices found for LON to IAD flights in December, January
14 Dec - 15 Dec
£280pp
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow
13 Dec - 15 Dec
£284pp
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow
4 Dec - 15 Dec
£286pp
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow

London to Washington Dulles Intl 2021 flight deals

Cheap flights to Washington Dulles Intl from London found for this year
14 Dec - 15 Dec
£280pp
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow
13 Dec - 15 Dec
£284pp
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow
4 Dec - 15 Dec
£286pp
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow

Direct flights to Washington Dulles Intl from London

Save time with London to Washington Dulles Intl direct flight deals
3 Apr - 17 Apr
£317pp
LHR
London Heathrow
Virgin Atlantic
Direct
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Virgin Atlantic
Direct
LHR
London Heathrow
4 Feb - 7 Feb
£319pp
LHR
London Heathrow
Virgin Atlantic
Direct
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Virgin Atlantic
Direct
LHR
London Heathrow
20 Feb - 28 Feb
£320pp
LHR
London Heathrow
Virgin Atlantic
Direct
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Virgin Atlantic
Direct
LHR
London Heathrow

Last-minute flights from London to Washington Dulles Intl

Late deals on return flights to Washington Dulles Intl from London, departing today and this week
13 Dec - 15 Dec
£284pp
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow
10 Dec - 29 Dec
£314pp
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow
10 Dec - 12 Dec
£315pp
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow

One-way flights to Washington Dulles Intl from London

The cheapest one-way flights from London to Washington Dulles Intl
13:20 - 18:20
Multiple Airlines
2 stops
34h 00m
STN - IAD
Multiple Airlines
£154
Kiwi.com
01:25 - 18:20
Multiple Airlines
2 stops
45h 55m
LTN - IAD
Multiple Airlines
£161
Kiwi.com
17:05 - 18:20
Multiple Airlines
2 stops
30h 15m
STN - IAD
Multiple Airlines
£164
Kiwi.com

Related info for your journey

Useful info, stats and facts about London to Washington Dulles Intl flights.

Flight FAQs

From London to Washington Dulles Intl

Are flight prices decreasing from London to Washington Dulles Intl due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both London and Washington Dulles Intl for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

What safety measures are being taken by airlines flying from London to Washington Dulles Intl to control the spread of COVID-19?

New policies can now be found on Delta and Alitalia to help keep travellers safe while flying. New policies for travellers booking flights from London to Washington Dulles Intl include masks being provided and required on board, daily cleaning and sanitisation, use of HEPA filters, pre-flight testing for antibodies and symptoms, and socially-distanced seating (for a limited time). Keep in mind that policies will vary by airline.

Which airlines flying from London to Washington Dulles Intl have flexible cancellations due to COVID-19?

Virgin Atlantic, United Airlines, and British Airways are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from London to Washington Dulles Intl for under £299 on Cheapflights?

Yes, there are multiple flights from London to Washington Dulles Intl for under £299. The cheapest flight booked recently is on TAP AIR PORTUGAL for just £280, but on average you can expect to pay £306.

Are there direct flights from London to Washington Dulles Intl for under £374 on Cheapflights?

Cheapflights has 20 direct flights from London to Washington Dulles Intl under £374. A good price for a direct flight from London to Washington Dulles Intl is less than £383.

Are there last-minute flights available from London to Washington Dulles Intl for under £299?

There are currently 20+ open flights from London to Washington Dulles Intl within the next 7 days for less than £299.

Is London weather warmer or cooler than Washington Dulles Intl?

We forecast the temperature to be around the 31 °Cs in July, on average. The temperature in Washington Dulles Intl is generally hotter than in London. Book flights in a timely manner in correlation to your departure date.

How long does is the flight from London to Washington Dulles Intl?

KLM, Virgin Atlantic, and Delta can get you from London to Washington Dulles Intl in just under 8h 20m. Your travel time will be generally consistent. All flights are typically direct.

What are the cheapest airlines to flying from London to Washington Dulles Intl return?

According to our current data, TAP AIR PORTUGAL (£281), and Virgin Atlantic (£321) offers the cheapest pricing from London to Washington Dulles Intl. TAP AIR PORTUGAL is 45% cheaper than the average price of flights available within the next 90 days to this destination.

Alternative routes for London to Washington Dulles Intl

Destination information for Washington Dulles Intl

Things to know before you go. Useful info for your trip from London to Washington Dulles Intl
Today's exchange rate
£1 = $1.34
Flight duration
8h 00m
Average temperature for December in Washington Dulles Intl
9.0 °C
Avg rainfall for December in Washington Dulles Intl
81.0 mm

Airports servicing London

Stansted (STN)
City (LCY)
Gatwick (LGW)
Heathrow (LHR)
Luton (LTN)

Airports servicing Washington

Top 10 airlines from London to Washington Dulles Intl

The chart below displays the airlines Cheapflights users travelling from London to Washington Dulles Intl choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.

Airline Cheapest Average Flexibility On-time COVID-19 safety
TAP AIR PORTUGAL
£420 £585 No change fee N/A
Search TAP AIR PORTUGAL flights
Air Canada
£394 £653 No cancel fee 67%
Search Air Canada flights
SAS
£414 £725 No change fee 77%
Search SAS flights
Royal Air Maroc
£688 £751 No cancel fee 75%

We couldn't confirm the COVID-19 safety measures taken by Royal Air Maroc. Please check directly on their website for additional information.

Search Royal Air Maroc flights
American Airlines
£477 £758 No cancel fee 71%
Search American Airlines flights
SWISS
£645 £775 No change fee 79%
Search SWISS flights
Brussels Airlines
£479 £779 No change fee N/A
Search Brussels Airlines flights
Finnair
£500 £815 No change fee 76%
Search Finnair flights
Delta
£458 £870 No cancel fee N/A
Search Delta flights
Air France
£469 £878 No change fee 77%
Search Air France flights

Hourly flight availability from London to Washington Dulles Intl

Morning 6 AM to midday 62% of flight departures
Afternoon Midday to 6 PM 37% of flight departures
Early morning Midnight to 6 AM 1% of flight departures
Evening 6 PM to midnight 0% of flight departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from London to Washington Dulles Intl
Sunday
6 daily flights
Monday
11 daily flights
Tuesday
11 daily flights
Wednesday
11 daily flights
Thursday
11 daily flights
Friday
11 daily flights
Saturday
6 daily flights