
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $651 (Air Canada) |
One-way from | $317 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $794 |
Good round-trip deal | $734 or less |
Good one-way deal | $733 or less |
Fly from
Fly to
Route
Depart
Return
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Tue 8/11
8:45 am-4:45 pm
1 stop13h 00m
Washington, D.C. Dulles Intl
Sat 8/22
6:15 am-8:40 pm
1 stop9h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Mon 8/10
7:30 am-4:05 pm
1 stop13h 35m
Washington, D.C. Dulles Intl
Fri 8/21
6:30 pm-6:55 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - DCA
LHRDCA
London Heathrow
Tue 7/21
9:30 am-3:38 pm
1 stop11h 08m
Washington, D.C. Reagan-National
Tue 7/28
11:00 am-5:55 am
1 stop13h 55m
LondonWashington, D.C.
LHR - DCA
LHRDCA
London Heathrow
Fri 7/3
6:05 pm-12:01 am
1 stop10h 56m
Washington, D.C. Reagan-National
Wed 9/2
4:59 pm-8:00 am
1 stop10h 01m
LondonWashington, D.C.
LHR - DCA
LHRDCA
London Heathrow
Wed 7/15
1:45 pm-8:41 pm
1 stop11h 56m
Washington, D.C. Reagan-National
Wed 8/5
6:23 pm-9:10 am
1 stop9h 47m
LondonWashington, D.C.
LTN - IAD
LTNIAD
London Luton
Wed 7/29
6:15 am-10:15 pm
2 stops21h 00m
Washington, D.C. Dulles Intl
Wed 8/5
8:30 pm-9:15 pm
2 stops19h 45m
LondonWashington, D.C.
LHR - DCA
LHRDCA
London Heathrow
Thu 7/9
5:25 pm-11:31 pm
1 stop11h 06m
Washington, D.C. Reagan-National
Sat 7/11
7:58 pm-9:40 pm
1 stop20h 42m
LondonWashington, D.C.
LCY - IAD
LCYIAD
London City
Tue 7/7
7:15 pm-3:30 pm
1 stop25h 15m
Washington, D.C. Dulles Intl
Sun 7/12
5:40 pm-12:35 pm
1 stop13h 55m
LondonWashington, D.C.
LCY - IAD
LCYIAD
London City
Wed 7/1
7:15 pm-3:30 pm
1 stop25h 15m
Washington, D.C. Dulles Intl
Tue 7/14
5:40 pm-12:35 pm
1 stop13h 55m
LondonWashington, D.C.
LHR - DCA
LHRDCA
London Heathrow
Thu 8/6
5:25 pm-11:33 pm
1 stop11h 08m
Washington, D.C. Reagan-National
Sat 8/15
6:23 pm-9:50 am
1 stop10h 27m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
Currently, September is the cheapest month in which you can book a flight from London to Washington, D.C. (average of $597). Flying from London to Washington, D.C. in June is currently the most expensive (average of $879). 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.
When flying from London to Washington, D.C., the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
The most flights from LON to WAS are scheduled on a Wednesday (28 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (27 on average).
Dublin (DUB) – chosen by Cheapflights users on 40% of 1-stop itineraries from London to Washington, D.C. on Cheapflights.
Lisbon (LIS) is the most affordable 1-stop option, with an average round-trip price of $509.
Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 11h 05m.
Flights via Lisbon (LIS) offer the fastest connection on this route, with an average layover time of 1h 23m.
About 18% of weekly flights between London and Washington, D.C. have experienced delays in the past year, with the average delay time being 133 minutes.
Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Over the last year, United Airlines have had the lowest number of delays on this route, with just 12% of flights being delayed.
To ensure you get the cheapest price possible for a flight from London to Washington, D.C., you should look to book at least 79 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
Boarding
Food
Comfort
Entertainment
Overall
Crew
Reviews
Rakshith,May 2026
TPE - SEA
Boarding
Food
Comfort
Entertainment
Overall
Crew
Reviews
Rakshith,May 2026
TPE - SEA
Boarding
Food
Comfort
Entertainment
Overall
Crew
Reviews
Rakshith,May 2026
TPE - SEA
Boarding
Food
Comfort
Entertainment
Overall
Crew
Reviews
Rakshith,May 2026
TPE - SEA
Boarding
Food
Comfort
Entertainment
Overall
Crew
Reviews
Rakshith,May 2026
TPE - SEA
Boarding
Food
Comfort
Entertainment
Overall
Crew
Reviews
Rakshith,May 2026
TPE - SEA
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$320 | Average$968 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$466 | Average$664 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$473 | Average$730 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$523 | Average$742 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$534 | Average$743 | FlexibilityNo cancel fee | On-time78% | |
| Cheapest$559 | Average$796 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$567 | Average$772 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$571 | Average$770 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$635 | Average$663 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$658 | Average$804 | FlexibilityNo cancel fee | On-timeN/A |