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

Return flights

03 Dec - 17 Dec	Iberia
06 Dec - 09 Dec	Spirit Airlines
16 Dec - 05 Jan	British Airways
08 Dec - 11 Dec	Frontier Airlines
25 Dec - 08 Jan	British Airways
04 Dec - 18 Dec	British Airways
06 Dec - 20 Dec	British Airways
04 Dec - 18 Dec	Lufthansa	direct
06 Dec - 20 Dec	Discover Airlines	direct
29 Dec - 04 Jan	Aer Lingus
25 Dec - 08 Jan	Discover Airlines	direct
23 Dec - 30 Dec	Lufthansa	direct
28 Dec - 04 Jan	British Airways
30 Dec - 04 Jan	British Airways
27 Dec - 04 Jan	British Airways
26 Dec - 04 Jan	British Airways
26 Dec - 03 Jan	British Airways
23 Dec - 03 Jan	British Airways
18 Dec - 25 Dec	Discover Airlines	direct
21 Dec - 23 Dec	jetBlue

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 $663

Return flights