
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $561 (oojo) |
One-way from | $196 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $644 |
Good round-trip deal | $681 or less |
Good one-way deal | $357 or less |
Fly from
Fly to
Route
Depart
Return
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Sun 4/19
8:20 pm-6:50 pm
2 stops17h 30m
London Heathrow
Sun 4/26
9:05 pm-5:00 pm
2 stops24h 55m
Washington, D.C.London
IAD - LTN
IADLTN
Washington, D.C. Dulles Intl
Fri 4/24
8:30 pm-5:25 pm
2 stops15h 55m
London Luton
Wed 4/29
6:15 am-7:20 pm
2 stops18h 05m
BaltimoreLondon
BWI - LGW
BWILGW
Baltimore/Washington
Wed 5/20
8:30 pm-11:45 am
1 stop10h 15m
London Gatwick
Thu 5/28
1:00 pm-7:25 pm
1 stop11h 25m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Mon 5/4
6:25 pm-6:55 am
Nonstop7h 30m
London Heathrow
Mon 5/11
12:10 pm-4:45 pm
1 stop33h 35m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Mon 3/9
7:59 pm-10:15 am
1 stop10h 16m
London Heathrow
Tue 3/17
4:50 pm-9:30 pm
Nonstop8h 40m
Washington, D.C.London
IAD - LTN
IADLTN
Washington, D.C. Dulles Intl
Mon 5/4
5:25 pm-7:05 pm
2 stops20h 40m
London Luton
Mon 5/11
8:25 am-1:30 pm
2 stops34h 05m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Wed 4/22
10:10 pm-10:40 am
Nonstop7h 30m
London Heathrow
Mon 4/27
5:50 pm-2:20 pm
1 stop25h 30m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Wed 3/18
1:13 pm-7:10 am
1 stop13h 57m
London Heathrow
Mon 4/13
11:05 am-2:20 pm
1 stop32h 15m
BaltimoreLondon
BWI - LHR
BWILHR
Baltimore/Washington
Tue 4/14
9:30 pm-9:50 am
Nonstop7h 20m
London Heathrow
Thu 4/23
4:25 pm-7:40 pm
Nonstop8h 15m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Mon 4/27
10:55 pm-11:20 am
Nonstop7h 25m
London Heathrow
Tue 5/5
5:55 pm-8:55 pm
Nonstop8h 00m
| 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 Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
The best time to book flights from Washington, D.C. to London is 47 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 $86). Flying from Washington, D.C. to London in June is currently the most expensive (average of $706). 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.
The most flights from WAS to LON are scheduled on a Wednesday (26 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (20 on average).
Reykjavik (KEF) – chosen by Cheapflights users on 73% 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 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 165 minutes.
Historically, flights departing in the morning 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, British Airways have had the lowest number of delays on this route, with just 15% of flights being delayed.
Overall
Food
Boarding
Crew
Comfort
Entertainment
Reviews
Dane,Jan 2026
TYS - IAD
Overall
Food
Boarding
Crew
Comfort
Entertainment
Reviews
Dane,Jan 2026
TYS - IAD
Overall
Food
Boarding
Crew
Comfort
Entertainment
Reviews
Dane,Jan 2026
TYS - IAD
Overall
Food
Boarding
Crew
Comfort
Entertainment
Reviews
Dane,Jan 2026
TYS - IAD
Overall
Food
Boarding
Crew
Comfort
Entertainment
Reviews
Dane,Jan 2026
TYS - IAD
Overall
Food
Boarding
Crew
Comfort
Entertainment
Reviews
Dane,Jan 2026
TYS - IAD
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$31 | Average$822 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$408 | Average$576 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$411 | Average$550 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$415 | Average$622 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$442 | Average$847 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$454 | Average$596 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$462 | Average$776 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$488 | Average$691 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$497 | Average$808 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$497 | Average$832 | FlexibilityNo cancel fee | On-time71% |