Flights from London to Washington DC

Our cheapest offers for flights from London to Washington DC

Here you can compare cheap flights from London (LON) to Washington DC (WAS) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to Washington DC. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
London
Washington-DC
Outbound
25/11/25
1 Stopover (KEF)
FI0471, FI0645
11h 25min
Return
30/11/25
1 Stopover (KEF)
FI0644, FI0470
10h 15min
Icelandair
£357
found 3 days ago
Best option
London
Washington-DC
Outbound
20/10/25
1 Stopover (AMS)
KL1002, KL0651
11h 55min
Return
11/11/25
direct
KL4809
07h 30min
KLM ?
£612
London
Washington-DC
Outbound
25/11/25
1 Stopover (KEF)
FI0471, FI0645
11h 25min
Return
30/11/25
1 Stopover (KEF)
FI0644, FI0470
10h 15min
Icelandair
£363
found 3 days ago
London
Washington-DC
Outbound
25/11/25
1 Stopover (KEF)
FI0471, FI0645
11h 25min
Return
30/11/25
1 Stopover (KEF)
FI0644, FI0470
10h 15min
Icelandair
£371
found 3 days ago
London
Washington-DC
Outbound
25/11/25
1 Stopover (KEF)
FI0471, FI0645
11h 25min
Return
30/11/25
1 Stopover (KEF)
FI0644, FI0470
10h 15min
Icelandair
£387
found 3 days ago
London
Washington-DC
Outbound
25/11/25
1 Stopover (LIS)
TP1363, TP0231
13h 35min
Return
30/11/25
1 Stopover (LIS)
TP0234, TP1356
14h 00min
TAP Air Portugal
£387
found 3 days ago
London
Washington-DC
Outbound
25/11/25
1 Stopover (LIS)
TP1363, TP0231
13h 35min
Return
30/11/25
1 Stopover (LIS)
TP0234, TP1366
19h 10min
TAP Air Portugal ?
£411
found 3 days ago
London
Washington-DC
Outbound
25/11/25
1 Stopover (LIS)
TP1363, TP0231
13h 35min
Return
30/11/25
1 Stopover (LIS)
TP0234, TP1356
14h 00min
TAP Air Portugal ?
£444
found 3 days ago
London
Washington-DC
Outbound
20/10/25
1 Stopover (KEF)
FI0473, FI0645
32h 40min
Return
11/11/25
1 Stopover (KEF)
FI0644, FI0470
10h 15min
Icelandair
£481
London
Washington-DC
Outbound
25/11/25
1 Stopover (DUB)
EI0151, EI0117
12h 45min
Return
30/11/25
1 Stopover (DUB)
EI0116, EI0152
10h 00min
Aer Lingus Irish Airlines ?
£488
found 3 days ago
Prices based on recent searches, subject to last-minute changes
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Tips and tricks to help you find cheap flights from London to Washington DC

Favourite airline: Icelandair
Flight tickets on the route London – Washington-DC are most frequently booked with Icelandair.
Icelandair
28 %
Aer Lingus
25 %
TAP Portugal
21 %
Cheapest weekday: Sunday
The cheapest days to fly on this route are Sunday.
Stopover flights are the cheapest connection
On this route, direct flights are £183.00 more expensive than flights with a stopover.
non stop flight
1 stop
2 stops
08h 05min
15h 25min
31h 33min
£655
£472
£1,151
Favourite connection: via Reykjavik-Keflavik
Flights with a stopover in Reykjavik-Keflavik are the most popular connection for this route.
Route
bookings
1 stopover Reykjavik-Keflavik International
15h 25min, from £472
29 %
1 stopover Dublin
13h 55min, from £652
27 %
1 stopover Lisbon
12h 25min, from £540
23 %

Important flight information

Flight information: London - Washington-DC

Outbound and return from £356.99
Flight duration min. 08:20 / max. 08:45
Return flight duration min. 07:00/ max. 08:22
Distance 5903 km
Flights per week 52
Departure airport Airport London (LCY, LGW, LHR, LTN, STN, SEN) (LON)
Arrival airport Airport Washington-DC (WAS)
Destination country Flights to United States
Alternative routes to United States
Flight destinations with a similar price