Flights from London to Philadelphia

Our cheapest offers for flights from London to Philadelphia

Here you can compare cheap flights from London (LON) 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
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
Best option
London
Philadelphia
Outbound
20/03/26
direct
AY5467
08h 05min
Return
17/04/26
direct
AY3866
07h 10min
Finnair
£653
London
Philadelphia
Outbound
20/03/26
2 Stopovers (KEF, BOS)
FI0471, FI0635, FI7853
47h 38min
Return
17/04/26
2 Stopovers (BOS, KEF)
FI7854, FI0632, FI0472
25h 20min
Icelandair
£640
London
Philadelphia
Outbound
19/02/26
2 Stopovers (ZRH, YYZ)
LX0461, LX4640, AC8936
18h 41min
Return
22/02/26
2 Stopovers (ORD, ZRH)
LX3305, LX3205, LX0466
24h 40min
Swiss International Air Lines, Air Canada
£473
London
Philadelphia
Outbound
19/02/26
2 Stopovers (ZRH, ORD)
LX0461, LX3204, LX3304
41h 17min
Return
22/02/26
2 Stopovers (ORD, ZRH)
LX3305, LX3205, LX0466
24h 40min
Swiss International Air Lines ?
£480
London
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
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
Philadelphia
Outbound
19/02/26
2 Stopovers (LIS, BOS)
TP1335, TP0215, TP4355
18h 33min
Return
22/02/26
2 Stopovers (BOS, LIS)
TP4352, TP0216, TP1336
15h 19min
TAP Air Portugal ?
£505
London
Philadelphia
Outbound
19/02/26
2 Stopovers (LIS, BOS)
TP1335, TP0215, B60359
18h 33min
Return
22/02/26
2 Stopovers (BOS, LIS)
B60860, TP0216, TP1336
15h 19min
TAP Air Portugal, JetBlue Airways
£517
London
Philadelphia
Outbound
20/03/26
1 Stopover (DUB)
BA4460, AA0723
12h 05min
Return
17/04/26
1 Stopover (DUB)
AA0722, BA4461
11h 10min
British Airways, American Airlines
£532
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 to Philadelphia

Favourite airline: Aer Lingus
55 % of travellers choose to book flights on this route with Aer Lingus, British Airways and Virgin Atlantic.
Aer Lingus
29 %
British Airways
19 %
Virgin Atlantic
7 %
Stopover flights are the cheapest connection
Flights with a stopover are on average £325.00 cheaper than direct flights.
non stop flight
1 stop
2 stops
08h 20min
11h 10min
41h 43min
£ 1.034
£ 709
£ 827
Favourite connection: via Dublin
The most popular flights on this route are via Dublin and are booked by 52 % of all travellers.
Route
bookings
1 stopover Dublin
11h 10min, from £ 709
52 %
Direct flights
08h 20min, from £ 1.034
16 %
1 stopover Boston Logan
13h 19min, from £ 848
13 %

Important flight information

Flight information: London - Philadelphia

Outbound and return from £ 470,27
Flight duration min. 08:10 / max. 08:45
Return flight duration min. 07:00/ max. 07:25
Distance 5715 km
Flights per week 23
Departure airport Airport London (LCY, LGW, LHR, LTN, STN, SEN) (LON)
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