
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $624 (Mytrip) |
One-way from | $305 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $702 |
Good round-trip deal | $756 or less |
Good one-way deal | $398 or less |
Fly from
Fly to
Route
Depart
Return
Washington, D.C.London
IAD - STN
IADSTN
Washington, D.C. Dulles Intl
Mon 4/6
1:20 pm-10:10 pm
1 stop27h 50m
London Stansted
Tue 4/14
5:35 pm-11:35 am
1 stop23h 00m
BaltimoreLondon
BWI - LTN
BWILTN
Baltimore/Washington
Sat 5/16
8:30 pm-1:15 pm
1 stop11h 45m
London Luton
Wed 5/20
6:15 am-7:25 pm
1 stop18h 10m
Washington, D.C.London
IAD - LGW
IADLGW
Washington, D.C. Dulles Intl
Wed 4/29
1:20 pm-9:55 am
1 stop15h 35m
London Gatwick
Sun 5/3
5:35 pm-7:50 pm
1 stop31h 15m
Washington, D.C.London
IAD - LTN
IADLTN
Washington, D.C. Dulles Intl
Sun 4/12
1:20 pm-9:30 pm
2 stops27h 10m
London Luton
Tue 4/21
5:00 am-11:35 am
2 stops35h 35m
BaltimoreLondon
BWI - LTN
BWILTN
Baltimore/Washington
Tue 4/21
8:30 pm-12:55 pm
1 stop11h 25m
London Luton
Sun 4/26
6:25 am-7:25 pm
1 stop18h 00m
BaltimoreLondon
BWI - LTN
BWILTN
Baltimore/Washington
Sat 5/2
8:30 pm-1:15 pm
1 stop11h 45m
London Luton
Wed 5/6
6:15 am-7:25 pm
1 stop18h 10m
Washington, D.C.London
IAD - STN
IADSTN
Washington, D.C. Dulles Intl
Fri 9/11
9:45 pm-10:10 pm
1 stop19h 25m
London Stansted
Sun 9/20
6:55 am-7:50 pm
1 stop17h 55m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Tue 5/5
6:25 pm-6:55 am
Nonstop7h 30m
London Heathrow
Tue 5/19
6:50 am-2:20 pm
1 stop12h 30m
Washington, D.C.London
IAD - LGW
IADLGW
Washington, D.C. Dulles Intl
Mon 8/10
7:59 pm-4:00 pm
2 stops15h 01m
London Gatwick
Thu 8/20
10:25 am-7:35 pm
1 stop14h 10m
Washington, D.C.London
DCA - LHR
DCALHR
Washington, D.C. Reagan-National
Tue 5/5
11:00 am-9:35 am
2 stops17h 35m
London Heathrow
Wed 5/13
7:05 am-11:35 pm
2 stops21h 30m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
The best time to book flights from Washington, D.C. to London is 51 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, March is the cheapest month in which you can book a flight from Washington, D.C. to London (average of $31). Flying from Washington, D.C. to London in June is currently the most expensive (average of $699). 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 50% on your trip compared to booking a flight at noon.
New York (JFK) – chosen by Cheapflights users on 47% of 1-stop itineraries from Washington, D.C. to London on Cheapflights.
Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $538.
Flights via Montreal (YUL) have the shortest average one-way travel time for 1-stop routes: 9h 20m.
Flights via Zurich (ZRH) offer the fastest connection on this route, with an average layover time of 1h 23m.
About 19% of weekly flights between Washington, D.C. and London have experienced delays in the past year, with the average delay time being 164 minutes.
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
Monday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Over the last year, Virgin Atlantic have had the lowest number of delays on this route, with just 15% of flights being delayed.
Entertainment
Food
Comfort
Crew
Boarding
Overall
Reviews
Dane,Jan 2026
TYS - IAD
Entertainment
Food
Comfort
Crew
Boarding
Overall
Reviews
Dane,Jan 2026
TYS - IAD
Entertainment
Food
Comfort
Crew
Boarding
Overall
Reviews
Dane,Jan 2026
TYS - IAD
Entertainment
Food
Comfort
Crew
Boarding
Overall
Reviews
Dane,Jan 2026
TYS - IAD
Entertainment
Food
Comfort
Crew
Boarding
Overall
Reviews
Dane,Jan 2026
TYS - IAD
Entertainment
Food
Comfort
Crew
Boarding
Overall
Reviews
Dane,Jan 2026
TYS - IAD
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$231 | Average$788 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$395 | Average$549 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$398 | Average$626 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$406 | Average$468 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$454 | Average$598 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$462 | Average$858 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$497 | Average$809 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$520 | Average$804 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$527 | Average$732 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$529 | Average$762 | FlexibilityNo cancel fee | On-time70% |