Flights from London Heathrow to Washington DC

Our cheapest offers for flights from London Heathrow to Washington DC

Here you can compare cheap flights from London Heathrow (LHR) to Washington DC (IAD) 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 Heathrow
Washington DC
Outbound
09/10/25
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Return
14/10/25
1 Stopover (KEF)
FI0644, FI0450
10h 25min
Icelandair
£512
Best option
London Heathrow
Washington DC
Outbound
17/06/25
direct
AF9651
08h 25min
Return
01/07/25
direct
AF9652
07h 30min
Air France ?
£615
London Heathrow
Washington DC
Outbound
20/10/25
1 Stopover (KEF)
FI0455, FI0645
26h 55min
Return
11/11/25
1 Stopover (KEF)
FI0644, FI0450
10h 10min
Icelandair
£515
London Heathrow
Washington DC
Outbound
09/10/25
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Return
14/10/25
1 Stopover (KEF)
FI0644, FI0450
10h 25min
Icelandair ?
£531
London Heathrow
Washington DC
Outbound
20/10/25
1 Stopover (KEF)
FI0455, FI0645
26h 55min
Return
11/11/25
1 Stopover (KEF)
FI0644, FI0450
10h 10min
Icelandair
£533
London Heathrow
Washington DC
Outbound
20/10/25
1 Stopover (KEF)
FI0455, FI0645
26h 55min
Return
11/11/25
1 Stopover (KEF)
FI0644, FI0450
10h 10min
Icelandair ?
£552
London Heathrow
Washington DC
Outbound
09/10/25
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Return
14/10/25
1 Stopover (KEF)
FI0644, FI0454
18h 50min
Icelandair
£553
London Heathrow
Washington DC
Outbound
03/09/25
1 Stopover (CPH)
SK0502, SK0925
14h 39min
Return
15/09/25
1 Stopover (CPH)
SK0926, SK1517
14h 35min
SAS Scandinavian Airlines ?
£570
London Heathrow
Washington DC
Outbound
13/10/25
1 Stopover (LIS)
TP1369, TP0231
24h 30min
Return
15/10/25
1 Stopover (LIS)
TP0232, TP1366
24h 05min
TAP Air Portugal
£592
London Heathrow
Washington DC
Outbound
03/09/25
1 Stopover (CPH)
SK1508, SK0925
29h 29min
Return
15/09/25
1 Stopover (CPH)
SK0926, SK1507
15h 25min
SAS Scandinavian Airlines ?
£595
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 Heathrow to Washington DC

Favourite airline: Aer Lingus
The majority of passengers on the route London Heathrow – Washington DC prefer to fly with Aer Lingus.
Aer Lingus
32 %
TAP Portugal
25 %
Icelandair
18 %
Cheapest weekday: Saturday
Compared to other weekdays, flights are cheapest on Saturday.
Stopover flights are the cheapest connection
Flights with a stopover are on average £183.00 cheaper than direct flights.
non stop flight
1 stop
08h 05min
15h 25min
£655
£472
Favourite connection: via Dublin
Stopover flights on this route are especially popular via Dublin, making up 33 % of bookings.
Route
bookings
1 stopover Dublin
13h 55min, from £652
33 %
1 stopover Lisbon
12h 25min, from £540
26 %
1 stopover Reykjavik-Keflavik International
15h 25min, from £472
19 %

Important flight information

Flight information: London Heathrow - Washington DC

Outbound and return from £511.81
Flight duration min. 08:20 / max. 08:45
Return flight duration min. 07:00/ max. 07:25
Distance 5908 km
Flights per week 52
Departure airport Airport London Heathrow (LHR)
Arrival airport Airport Washington DC - Dulles International Airport, DC (IAD)
Destination country Flights to United States
Alternative routes to United States
Alternative flights to Washington DC
Popular destinations for onward travel
Flight destinations with a similar price