Flights from Washington DC to London Heathrow

Our cheapest offers for flights from Washington DC to London Heathrow

Here you can compare cheap flights from Washington DC (IAD) to London Heathrow (LHR) 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 London Heathrow. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
Washington DC
London Heathrow
Outbound
03/04/25
1 Stopover (KEF)
FI0644, FI0454
18h 50min
Return
03/29/25
1 Stopover (KEF)
FI0455, FI0645
26h 35min
Icelandair
$430
Best option
Washington DC
London Heathrow
Outbound
02/09/25
direct
AY5416
07h 15min
Return
02/21/25
direct
AY5417
08h 25min
Finnair
$568
Washington DC
London Heathrow
Outbound
03/04/25
1 Stopover (KEF)
FI0644, FI0454
18h 50min
Return
03/29/25
1 Stopover (KEF)
FI0455, FI0645
26h 35min
Icelandair
$431
Washington DC
London Heathrow
Outbound
02/23/25
1 Stopover (CPH)
SK0926, SK0505
17h 50min
Return
03/15/25
1 Stopover (CPH)
SK0500, SK0925
14h 00min
SAS Scandinavian Airlines ?
$437
Washington DC
London Heathrow
Outbound
03/21/25
1 Stopover (CPH)
SK0926, SK0505
17h 50min
Return
04/10/25
1 Stopover (CPH)
SK0502, SK0925
14h 39min
SAS Scandinavian Airlines
$441
Washington DC
London Heathrow
Outbound
03/21/25
1 Stopover (CPH)
SK0926, SK0501
11h 10min
Return
04/10/25
2 Stopovers (OSL, CPH)
SK0802, SK1467, SK0925
17h 54min
SAS Scandinavian Airlines
$442
Washington DC
London Heathrow
Outbound
03/21/25
1 Stopover (CPH)
SK0926, SK0505
17h 50min
Return
04/10/25
1 Stopover (CPH)
SK0502, SK0925
14h 39min
SAS Scandinavian Airlines
$443
Washington DC
London Heathrow
Outbound
03/21/25
1 Stopover (CPH)
SK0926, SK0505
17h 50min
Return
04/10/25
1 Stopover (CPH)
SK0502, SK0925
14h 39min
SAS Scandinavian Airlines ?
$447
Washington DC
London Heathrow
Outbound
02/07/25
1 Stopover (KEF)
FI0644, FI0454
18h 50min
Return
03/09/25
1 Stopover (KEF)
FI0455, FI0645
26h 45min
Icelandair ?
$449
Washington DC
London Heathrow
Outbound
02/23/25
1 Stopover (CPH)
SK0926, SK0501
11h 10min
Return
03/15/25
1 Stopover (CPH)
SK0500, SK0925
14h 00min
SAS Scandinavian Airlines ?
$452
Prices based on recent searches, subject to last-minute changes
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Tips and tricks to help you find cheap flights from Washington DC to London Heathrow

Favorite airline: Aer Lingus
Aer Lingus is the most popular airline for flights from Washington DC to London Heathrow.
Aer Lingus
30 %
Icelandair
24 %
British Airways
17 %
Cheapest weekday: Thursday
Compared to other weekdays, flights are cheapest on Thursday.
Stopover flights are the cheapest connection
Compared to flights with a stopover, direct flights are $129.00 more expensive on this route.
non stop flight
1 stop
2 stops
07h 20min
18h 45min
21h 40min
$ 562
$ 433
$ 599
Favourite connection: via Dublin
When booking flights from Washington DC to London Heathrow 33 % of travelers prefer to fly via Dublin.
Route
bookings
1 stopover Dublin
11h 00min, from $ 442
33 %
1 stopover Reykjavik-Keflavik International
18h 45min, from $ 433
27 %
Direct flights
07h 20min, from $ 562
22 %

Important flight information

Flight information: Washington DC - London Heathrow

Roundtrip from $ 429,01
Flight duration min. 07:00 / max. 07:25
Return flight duration min. 08:20/ max. 08:45
Distance 5908 km
Flights per week 52
Departure airport Airport Washington DC - Dulles International Airport, DC (IAD)
Arrival airport Airport London Heathrow (LHR)
Destination country Flights to United Kingdom
Alternative routes to United Kingdom
Alternative flights to London Heathrow
Flight destinations with a similar price
Flight destinations with a similar price