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

Return flights

25 Dec - 11 Jan	Frontier Airlines
23 Dec - 17 Jan	Spirit Airlines
24 Dec - 10 Jan	Spirit Airlines
18 Dec - 10 Jan	Spirit Airlines
31 Dec - 07 Jan	Lufthansa
30 Dec - 06 Jan	jetBlue
16 Dec - 23 Dec	Aer Lingus
07 Dec - 21 Dec	Frontier Airlines
13 Dec - 31 Dec	Frontier Airlines
28 Dec - 06 Jan	United
25 Dec - 01 Jan	Lufthansa	direct
25 Dec - 11 Jan	Discover Airlines	direct
06 Dec - 20 Dec	Frontier Airlines
17 Dec - 31 Dec	Spirit Airlines
06 Dec - 20 Dec	Discover Airlines	direct
16 Dec - 31 Dec	Frontier Airlines
25 Dec - 08 Jan	Lufthansa	direct
23 Dec - 30 Dec	Discover Airlines	direct

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 733€

Return flights