Menu

Cheap flights from Washington Dulles Intl (IAD) to London (LON)

Know your dates, get live prices in seconds:

From
To
Depart
Return
Any month
Compare vs. Cheapflights |
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime

We work with more than 300 partners to bring you better travel deals

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

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

IAD - LON
Price
$546 - $974
LON
Temperature
48.2 - 73.4 °F
LON
Rainfall
1.4 - 2.8 inches
Popular in June High demand for flights, 29% potential price rise
Cheapest in February Best time to find cheap flights, 21% potential price drop
Round-trip from $546 From Washington Dulles Intl to London
One-way from $172 One-way flight from Washington Dulles Intl to London
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 round-trip from Washington Dulles Intl to London?

Monday is generally a great day to depart. Flying on this day could help you save up to 10%.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 51 days in advance, which can save you up to 38% on flights from Washington Dulles Intl to London compared to booking the week you need them. Waiting 51 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $813. For sooner than that we have options available in the next 3 days from $886.

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

Our data shows that February tends to be the cheapest month to fly to London from Washington Dulles Intl. Users have commonly found prices around $634 for the month, but tickets can be as low as $394. Due to multiple factors, prepare for potentially higher prices in June.

Cheap flights from Washington Dulles Intl to London in July, August 2020

The best prices found for IAD to LON flights for July, August
14 Jul - 11 Aug
$572pp
IAD
Washington Dulles Intl
Multiple Airlines
 
1 STOP
LTN
London Luton
LTN
London Luton
Multiple Airlines
 
1 STOP
IAD
Washington Dulles Intl
8 Jul - 2 Aug
$582pp
IAD
Washington Dulles Intl
Multiple Airlines
 
1 STOP
LTN
London Luton
LTN
London Luton
Multiple Airlines
   
2 STOPS
IAD
Washington Dulles Intl
12 Jul - 11 Aug
$586pp
IAD
Washington Dulles Intl
Multiple Airlines
 
1 STOP
LTN
London Luton
LTN
London Luton
Multiple Airlines
 
1 STOP
IAD
Washington Dulles Intl

Washington Dulles Intl to London 2020 flight deals

Cheap flights to London from Washington Dulles Intl found for this year
30 Oct - 20 Nov
$416pp
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
4 Sep - 18 Sep
$418pp
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl
4 Sep - 19 Sep
$419pp
IAD
Washington Dulles Intl
TAP AIR PORTUGAL
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
TAP AIR PORTUGAL
 
1 STOP
IAD
Washington Dulles Intl

Non-stop flights to London from Washington Dulles Intl

Save time with Washington Dulles Intl to London direct flight deals
19 Oct - 2 Nov
$597pp
IAD
Washington Dulles Intl
Multiple Airlines
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Iberia
Non-Stop
IAD
Washington Dulles Intl
19 Oct - 2 Nov
$600pp
IAD
Washington Dulles Intl
Austrian Airlines
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Austrian Airlines
Non-Stop
IAD
Washington Dulles Intl
9 Nov - 16 Nov
$603pp
IAD
Washington Dulles Intl
Multiple Airlines
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Lufthansa
Non-Stop
IAD
Washington Dulles Intl

Last minute flights from Washington Dulles Intl to London

Late deals on round-trip flights to London from Washington Dulles Intl, departing today and this week
23 Jun - 14 Jul
$723pp
IAD
Washington Dulles Intl
Lufthansa
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Lufthansa
 
1 STOP
IAD
Washington Dulles Intl
23 Jun - 14 Jul
$724pp
IAD
Washington Dulles Intl
Brussels Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Brussels Airlines
 
1 STOP
IAD
Washington Dulles Intl
25 Jun - 7 Jul
$783pp
IAD
Washington Dulles Intl
Brussels Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Brussels Airlines
 
1 STOP
IAD
Washington Dulles Intl

One-way flights to London from Washington Dulles Intl

The cheapest one-way flights from Washington Dulles Intl to London
6:35 pm - 6:55 pm
TAP AIR PORTUGAL
1 Stop
19h 20m
IAD - LHR
TAP AIR PORTUGAL
$172
mytrip.com
6:35 pm - 2:50 pm
TAP AIR PORTUGAL
1 Stop
15h 15m
IAD - LHR
TAP AIR PORTUGAL
$173
mytrip.com
6:35 pm - 1:45 pm
TAP AIR PORTUGAL
1 Stop
14h 10m
IAD - LHR
TAP AIR PORTUGAL
$175
Gotogate

Related info for your journey

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

Flight FAQs

From Washington Dulles Intl to London

Are flight prices decreasing from Washington Dulles Intl to London 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 Washington Dulles Intl and London 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.

Can I find flights from Washington Dulles Intl to London for under $500 on Cheapflights?

Yes, there are multiple flights from Washington Dulles Intl to London for under $500. The cheapest flight booked recently is on TAP AIR PORTUGAL for just $416, but on average you can expect to pay $425.

Are there nonstop flights from Washington Dulles Intl to London for under $600 on Cheapflights?

Cheapflights has at least 20 direct flights from Washington Dulles Intl to London under $600. A good price for a nonstop flight from Washington Dulles Intl to London is less than $614.

Are there last-minute flights available from Washington Dulles Intl to London for under $800?

There are currently 20+ open flights from Washington Dulles Intl to London within the next 7 days for less than $800.

What is the cheapest airline for this route?

When searching, try setting your filters to view flights for United Air Lines Inc., as currently they have the cheapest options available from Washington Dulles Intl to London. On average you can find 78 flights for this flight path daily.

Is Washington Dulles Intl weather warmer or cooler than London?

We forecast the temperature to be around the 88 °F's in July, on average. The temperature in London is generally colder than in Washington Dulles Intl. Book flights in a timely manner in correlation to your departure date.

Alternative routes for Washington Dulles Intl to London

Destination information for London

Things to know before you go. Useful info for your trip from Washington Dulles Intl to London
Today's exchange rate
$1 = £0.80
Average temperature for July in London
73.4 °F
Avg rainfall for July in London
1.6 ″

Airports servicing Washington

Airports servicing London

Heathrow (LHR)
Luton (LTN)
Stansted (STN)
City (LCY)
Southend (SEN)

Hourly flight availability from Washington Dulles Intl to London

Evening 6 PM to midnight 100% of IAD to LON departures
Early morning Midnight to 6 AM 0% of IAD to LON departures
Morning 6 AM to noon 0% of IAD to LON departures
Afternoon Noon to 6 PM 0% of IAD to LON departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Washington Dulles Intl to London
Sunday
11 daily flights
Monday
11 daily flights
Tuesday
11 daily flights
Wednesday
11 daily flights
Thursday
11 daily flights
Friday
11 daily flights
Saturday
11 daily flights