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
11/09/25
1 Stopover (LIS)
TP0234, TP1366
19h 10min
Return
12/07/25
1 Stopover (LIS)
TP1367, TP0233
13h 35min
TAP Air Portugal ?
$436
Best option
Washington DC
London Heathrow
Outbound
11/09/25
direct
BA0292
07h 15min
Return
12/07/25
direct
BA0293
08h 30min
British Airways ?
$637
Washington DC
London Heathrow
Outbound
11/09/25
1 Stopover (LIS)
TP0234, TP1366
19h 10min
Return
12/07/25
1 Stopover (LIS)
TP1369, TP0231
24h 20min
TAP Air Portugal
$438
Washington DC
London Heathrow
Outbound
11/09/25
1 Stopover (LIS)
TP0234, TP1358
18h 05min
Return
12/07/25
1 Stopover (LIS)
TP1369, TP0231
24h 20min
TAP Air Portugal
$451
Washington DC
London Heathrow
Outbound
11/09/25
1 Stopover (LIS)
TP0234, TP1356
14h 00min
Return
12/07/25
1 Stopover (LIS)
TP1367, TP0233
13h 35min
TAP Air Portugal
$471
Washington DC
London Heathrow
Outbound
11/09/25
1 Stopover (LIS)
TP0234, TP1356
14h 00min
Return
12/07/25
1 Stopover (LIS)
TP1367, TP0233
13h 35min
TAP Air Portugal ?
$526
Washington DC
London Heathrow
Outbound
11/09/25
1 Stopover (KEF)
FI0644, FI0450
10h 10min
Return
12/07/25
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Icelandair ?
$582
Washington DC
London Heathrow
Outbound
11/09/25
direct
IB3589
07h 10min
Return
12/07/25
direct
IB3590
08h 25min
Iberia ?
$668
Washington DC
London Heathrow
Outbound
11/09/25
direct
AY7001
07h 15min
Return
12/07/25
1 Stopover (DUB)
AY8033, AY8327
12h 45min
Finnair ?
$805
Washington DC
London Heathrow
Outbound
11/09/25
1 Stopover (DUB)
AY8326, AY8032
10h 00min
Return
12/07/25
1 Stopover (DUB)
AY8033, AY8327
12h 45min
Finnair ?
$809
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 $435.36
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 flights to London Heathrow
Flight destinations with a similar price
Flight destinations with a similar price