Cheapest return flights from Philadelphia to London in December from $472

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

Return flights

10 Dec - 23 Dec Aer Lingus
10 Dec - 17 Dec Aer Lingus
08 Dec - 18 Dec Aer Lingus
07 Dec - 16 Dec Aer Lingus
08 Dec - 18 Dec American Airlines direct
07 Dec - 16 Dec British Airways direct
10 Dec - 23 Dec British Airways direct
03 Dec - 14 Dec Aer Lingus
02 Dec - 07 Dec American Airlines
16 Dec - 23 Dec Aer Lingus
16 Dec - 16 Jan American Airlines
16 Dec - 16 Jan British Airways direct
12 Dec - 07 Jan American Airlines
11 Dec - 12 Jan British Airways direct
12 Dec - 12 Jan British Airways
12 Dec - 12 Jan Finnair direct
12 Dec - 07 Jan Finnair direct
17 Dec - 16 Jan American Airlines
17 Dec - 16 Jan British Airways direct
17 Dec - 07 Jan American Airlines

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

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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