Cheapest return flights from Philadelphia to London in December from $527

AirHint found the following cheapest return flights from Philadelphia (PHL) to London (LGW) in December 2025 (see full year).

Return flights

05 Dec - 08 Dec Aer Lingus
03 Dec - 05 Dec Spirit Airlines
05 Dec - 09 Dec Aer Lingus
08 Dec - 15 Dec Frontier Airlines
04 Dec - 08 Dec Frontier Airlines
09 Dec - 15 Dec Lufthansa
13 Dec - 12 Jan Frontier Airlines
12 Dec - 18 Dec Aer Lingus
05 Dec - 10 Dec Spirit Airlines
12 Dec - 12 Jan Spirit Airlines
09 Dec - 19 Jan Frontier Airlines
01 Dec - 09 Dec Air Canada
07 Dec - 14 Dec Frontier Airlines
12 Dec - 13 Jan Spirit Airlines
31 Dec - 24 Jan Frontier Airlines
25 Dec - 17 Jan Frontier Airlines
27 Dec - 17 Jan Frontier Airlines
26 Dec - 17 Jan Frontier Airlines
24 Dec - 17 Jan Frontier Airlines
30 Dec - 10 Jan Air Canada

Also check the deals for one-way flights from Philadelphia to London in December.

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