Expect long security queues at IAD, especially in the afternoon and evening. Arrive early to navigate the check-in and security process smoothly.
Round-trip from | $490 (Mytrip) |
---|---|
One-way from | $170 (Trip.com) |
Popular in | June |
Cheapest in | September |
Average price | $636 |
Good round-trip deal | $648 or less |
Good one-way deal | $384 or less |
Fly from
Fly to
Route
Depart
Return
Price
Washington, D.C.London
IAD - LTN
IADLTN
Washington, D.C. Dulles Intl
Wed 11/12
7:40 pm-8:50 pm
1 stop20h 10m
London Luton
Mon 11/17
8:00 am-6:30 pm
1 stop15h 30m
Washington, D.C.London
IAD - LGW
IADLGW
Washington, D.C. Dulles Intl
Mon 11/10
7:40 pm-10:55 am
1 stop10h 15m
London Gatwick
Fri 11/14
11:55 am-6:30 pm
1 stop11h 35m
Washington, D.C.London
IAD - LGW
IADLGW
Washington, D.C. Dulles Intl
Tue 11/4
7:40 pm-10:55 am
1 stop10h 15m
London Gatwick
Mon 11/10
11:55 am-6:30 pm
1 stop11h 35m
Washington, D.C.London
IAD - LGW
IADLGW
Washington, D.C. Dulles Intl
Sun 12/7
7:40 pm-10:55 am
1 stop10h 15m
London Gatwick
Thu 12/11
11:55 am-6:30 pm
1 stop11h 35m
Washington, D.C.London
IAD - LGW
IADLGW
Washington, D.C. Dulles Intl
Tue 10/21
8:30 pm-2:40 pm
1 stop13h 10m
London Gatwick
Sat 11/22
11:55 am-6:30 pm
1 stop11h 35m
Washington, D.C.London
IAD - LGW
IADLGW
Washington, D.C. Dulles Intl
Mon 11/24
7:40 pm-10:55 am
1 stop10h 15m
London Gatwick
Wed 12/3
11:55 am-6:30 pm
1 stop11h 35m
Washington, D.C.London
IAD - STN
IADSTN
Washington, D.C. Dulles Intl
Thu 10/16
10:20 pm-9:55 pm
2 stops18h 35m
London Stansted
Thu 10/23
8:20 am-3:20 pm
2 stops36h 00m
Washington, D.C.London
IAD - STN
IADSTN
Washington, D.C. Dulles Intl
Thu 12/4
7:40 pm-4:35 pm
2 stops15h 55m
London Stansted
Mon 12/8
6:30 am-6:30 pm
2 stops17h 00m
Washington, D.C.London
IAD - STN
IADSTN
Washington, D.C. Dulles Intl
Mon 10/27
6:30 pm-1:55 pm
2 stops15h 25m
London Stansted
Wed 11/5
7:40 am-9:00 pm
2 stops18h 20m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Tue 10/21
12:09 pm-9:35 am
2 stops16h 26m
London Heathrow
Fri 10/31
7:50 pm-7:50 pm
2 stops28h 00m
The best time to book flights from Washington, D.C. to London is 70 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, November is the cheapest month in which you can book a flight from Washington, D.C. to London (average of $661). Flying from Washington, D.C. to London in June is currently the most expensive (average of $1,097). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
A simple way to save on the total cost of your ticket is to fly from Washington, D.C. to London in the morning. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight at noon.
Travelers seeking maximum savings on their Washington, D.C. to London flight should consider departing on Wednesday mornings when fares are most often at their lowest. Wednesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from WAS to LON are scheduled on a Wednesday (32 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 on average).
Reykjavik (KEF) – chosen by Cheapflights users on 75% of 1-stop itineraries from Washington, D.C. to London on Cheapflights.
Dublin (DUB) is the most affordable 1-stop option, with an average round-trip price of $479.
Flights via Montreal (YUL) have the shortest average one-way travel time for 1-stop routes: 9h 20m.
Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average layover time of 1h 20m.
Crew
Food
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Julia,Sep 2025
BUF - DEN
Crew
Food
Boarding
Overall
Comfort
Entertainment
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Julia,Sep 2025
BUF - DEN
Crew
Food
Boarding
Overall
Comfort
Entertainment
Reviews
Julia,Sep 2025
BUF - DEN
Crew
Food
Boarding
Overall
Comfort
Entertainment
Reviews
Julia,Sep 2025
BUF - DEN
Crew
Food
Boarding
Overall
Comfort
Entertainment
Reviews
Julia,Sep 2025
BUF - DEN
Crew
Food
Boarding
Overall
Comfort
Entertainment
Reviews
Julia,Sep 2025
BUF - DEN
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$31 | Average$806 | FlexibilityNo cancel fee | On-time62% | |
Cheapest$313 | Average$486 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$421 | Average$797 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$424 | Average$597 | FlexibilityNo cancel fee | On-time77% | |
Cheapest$433 | Average$619 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$441 | Average$601 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$447 | Average$812 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$497 | Average$851 | FlexibilityNo cancel fee | On-time72% | |
Cheapest$497 | Average$854 | FlexibilityNo cancel fee | On-time71% | |
Cheapest$506 | Average$858 | FlexibilityNo cancel fee | On-time69% |