Flight Routes from Washington DC to London Heathrow

Trip type

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
05/20/26
1 Stopover (LIS)
TP0234, TP1368
12h 00min
Return
-
TAP Air Portugal
$437
Washington DC
London Heathrow
Outbound
05/16/26
1 Stopover (KEF)
FI0644, FI0454
18h 50min
Return
05/29/26
1 Stopover (KEF)
FI0455, FI0645
26h 55min
Icelandair
$634
Best option
Washington DC
London Heathrow
Outbound
05/16/26
direct
BA0292
07h 25min
Return
05/29/26
direct
BA0293
08h 15min
British Airways ?
$802
Washington DC
London Heathrow
Outbound
05/16/26
1 Stopover (KEF)
FI0644, FI0454
18h 50min
Return
05/29/26
1 Stopover (KEF)
FI0455, FI0645
26h 55min
Icelandair
$637
Washington DC
London Heathrow
Outbound
05/16/26
1 Stopover (KEF)
FI0644, FI0450
10h 25min
Return
05/29/26
1 Stopover (KEF)
FI0455, FI0645
26h 55min
Icelandair ?
$659
Washington DC
London Heathrow
Outbound
05/16/26
1 Stopover (KEF)
FI0644, FI0450
10h 25min
Return
05/29/26
1 Stopover (KEF)
FI0455, FI0645
26h 55min
Icelandair ?
$728
Washington DC
London Heathrow
Outbound
05/16/26
1 Stopover (KEF)
FI0644, FI0454
18h 50min
Return
05/29/26
1 Stopover (KEF)
FI0451, FI0645
11h 15min
Icelandair
$755
Washington DC
London Heathrow
Outbound
05/16/26
1 Stopover (CPH)
SK0926, SK0505
14h 40min
Return
05/29/26
1 Stopover (CPH)
SK0502, SK0925
11h 30min
SAS Scandinavian Airlines ?
$760
Washington DC
London Heathrow
Outbound
05/16/26
direct
BA0292
07h 25min
Return
05/29/26
1 Stopover (CLT)
BA1610, BA5183
11h 58min
British Airways ?
$812
Washington DC
London Heathrow
Outbound
07/26/26
1 Stopover (DUB)
EI0118, EI0162
10h 40min
Return
08/05/26
1 Stopover (DUB)
EI0163, EI0119
10h 50min
Aer Lingus Irish Airlines ?
$812
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 USD
433 USD
599 USD
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 USD
33 %
1 stopover Reykjavik-Keflavik International
18h 45min, from 433 USD
27 %
Direct flights
07h 20min, from 562 USD
22 %

Important flight information

Flight information: Washington DC - London Heathrow

Cheapest outbound flight from 436,97 USD
Roundtrip from 633,03 USD
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
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