Flights from London Heathrow to Philadelphia

Our cheapest offers for flights from London Heathrow to Philadelphia

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

Outbound Return Airlines Shop Baggage Price
London Heathrow
Philadelphia
Outbound
04/11/25
1 Stopover (DUB)
BA5951, BA1580
11h 05min
Return
03/12/25
direct
BA0066
07h 00min
British Airways ?
£419
Best option
London Heathrow
Philadelphia
Outbound
08/12/25
direct
BA1588
08h 05min
Return
24/12/25
direct
BA0066
07h 00min
British Airways ?
£520
London Heathrow
Philadelphia
Outbound
04/11/25
1 Stopover (DUB)
EI0155, EI0115
11h 10min
Return
03/12/25
1 Stopover (DUB)
EI0114, EI0154
10h 35min
Aer Lingus Irish Airlines
£420
London Heathrow
Philadelphia
Outbound
08/12/25
2 Stopovers (BRU, YUL)
AC6330, AC0833, AC8859
12h 57min
Return
24/12/25
1 Stopover (YUL)
AC8862, AC0864
10h 40min
Air Canada ?
£458
London Heathrow
Philadelphia
Outbound
08/12/25
2 Stopovers (BRU, YUL)
AC6330, AC0833, AC8859
12h 57min
Return
24/12/25
1 Stopover (YUL)
LH6565, LH6839
10h 40min
Air Canada
£467
London Heathrow
Philadelphia
Outbound
08/12/25
2 Stopovers (BRU, YUL)
AC6330, AC0833, AC8859
12h 57min
Return
24/12/25
1 Stopover (YUL)
LH6565, LH6839
10h 40min
Air Canada
£469
London Heathrow
Philadelphia
Outbound
19/02/26
1 Stopover (DUB)
BA5951, BA1580
11h 05min
Return
22/02/26
1 Stopover (DUB)
BA1579, BA5964
11h 15min
British Airways ?
£471
London Heathrow
Philadelphia
Outbound
19/02/26
1 Stopover (YYZ)
LH6584, AC8936
14h 56min
Return
22/02/26
1 Stopover (YUL)
AC8862, AC0864
10h 40min
Lufthansa, Air Canada
£480
London Heathrow
Philadelphia
Outbound
19/02/26
1 Stopover (YYZ)
AC0857, AC8936
14h 56min
Return
22/02/26
1 Stopover (YUL)
AC8862, AC0864
10h 40min
Air Canada
£484
London Heathrow
Philadelphia
Outbound
08/12/25
1 Stopover (DUB)
BA0824, AY3803
12h 25min
Return
24/12/25
1 Stopover (BOS)
AA0877, AY3778
10h 25min
British Airways, Finnair
£488
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 Philadelphia

Favourite airline: Aer Lingus
76 % of flights booked on the route from London Heathrow to Philadelphia are booked with Aer Lingus, British Airways and United Airlines.
Aer Lingus
45 %
British Airways
21 %
United Airlines
10 %
Stopover flights are the cheapest connection
Compared to flights with a stopover, direct flights are £325.00 more expensive on this route.
non stop flight
1 stop
2 stops
08h 20min
11h 10min
51h 25min
£1,034
£709
£1,282
Favourite connection: via Dublin
When booking flights from London Heathrow to Philadelphia 59 % of travellers prefer to fly via Dublin.
Route
bookings
1 stopover Dublin
11h 10min, from £709
59 %
Direct flights
08h 20min, from £1,034
19 %
1 stopover Montréal-Pierre Elliott Trudeau International Airport
30h 04min, from £839
11 %

Important flight information

Flight information: London Heathrow - Philadelphia

Outbound and return from £418.07
Flight duration min. 08:10 / max. 08:45
Return flight duration min. 07:00/ max. 07:25
Distance 5696 km
Flights per week 23
Departure airport Airport London Heathrow (LHR)
Arrival airport Airport Philadelphia International Airport, PA (PHL)
Destination country Flights to United States
Alternative routes to United States
Alternative flights to Philadelphia
Flight destinations with a similar price