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

Return flights

10 Dec - 15 Dec	Aer Lingus
09 Dec - 16 Dec	Iberia
10 Dec - 14 Dec	Aer Lingus
29 Dec - 09 Jan	Air Canada
03 Dec - 11 Dec	Iberia
04 Dec - 11 Dec	Frontier Airlines
06 Dec - 09 Dec	TAP
25 Dec - 08 Jan	Frontier Airlines
03 Dec - 10 Dec	Frontier Airlines
24 Dec - 07 Jan	Frontier Airlines
16 Dec - 23 Dec	Aer Lingus
22 Dec - 05 Jan	Frontier Airlines
28 Dec - 06 Jan	United
25 Dec - 08 Jan	Discover Airlines	direct
16 Dec - 31 Dec	Aer Lingus
25 Dec - 01 Jan	Discover Airlines	direct
09 Dec - 16 Dec	Lufthansa	direct
29 Dec - 02 Jan	Air Canada
19 Dec - 01 Jan	Spirit Airlines

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

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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Cheapest return flights from Philadelphia to Frankfurt in December from $800

Return flights