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
02/02/26
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Return
16/02/26
1 Stopover (KEF)
FI0644, FI0450
10h 10min
Icelandair
£325
Best option
London Heathrow
Washington DC
Outbound
19/02/26
direct
BA0217
08h 25min
Return
22/02/26
direct
BA0216
07h 10min
British Airways
£411
London Heathrow
Washington DC
Outbound
09/12/25
1 Stopover (DUB)
BA5959, BA6159
12h 20min
Return
02/01/26
1 Stopover (DUB)
BA6158, BA5964
11h 25min
British Airways
£1,194
London Heathrow
Washington DC
Outbound
02/02/26
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Return
16/02/26
1 Stopover (KEF)
FI0644, FI0450
10h 10min
Icelandair
£329
London Heathrow
Washington DC
Outbound
02/02/26
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Return
16/02/26
1 Stopover (KEF)
FI0644, FI0450
10h 10min
Icelandair
£336
London Heathrow
Washington DC
Outbound
02/02/26
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Return
16/02/26
1 Stopover (KEF)
FI0644, FI0450
10h 10min
Icelandair
£345
London Heathrow
Washington DC
Outbound
20/03/26
1 Stopover (LIS)
TP1363, TP0233
20h 00min
Return
17/04/26
1 Stopover (LIS)
TP0232, TP1364
20h 45min
TAP Air Portugal
£388
London Heathrow
Washington DC
Outbound
20/03/26
1 Stopover (LIS)
TP1363, TP0233
20h 00min
Return
17/04/26
1 Stopover (LIS)
TP0232, TP1356
12h 15min
TAP Air Portugal ?
£394
London Heathrow
Washington DC
Outbound
02/02/26
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Return
16/02/26
1 Stopover (KEF)
FI0644, FI0450
10h 10min
Icelandair ?
£397
London Heathrow
Washington DC
Outbound
31/01/26
1 Stopover (LIS)
TP1363, TP0231
14h 15min
Return
03/02/26
1 Stopover (LIS)
TP0232, TP1366
24h 10min
TAP Air Portugal
£407
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 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 £324.99
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