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

Return flights

02 Dec - 09 Dec	Aer Lingus
04 Dec - 11 Dec	Frontier Airlines
03 Dec - 14 Dec	Spirit Airlines
09 Dec - 23 Dec	SWISS
09 Dec - 23 Dec	Discover Airlines	direct
11 Dec - 23 Dec	Air Canada
11 Dec - 18 Dec	Air Canada
11 Dec - 18 Dec	United	direct
11 Dec - 23 Dec	United	direct
02 Dec - 09 Dec	United	direct
23 Dec - 17 Jan	Air Canada
25 Dec - 17 Jan	Air Canada
16 Dec - 11 Jan	Frontier Airlines
16 Dec - 11 Jan	United	direct
25 Dec - 08 Jan	Discover Airlines	direct
27 Dec - 04 Jan	Frontier Airlines
23 Dec - 01 Jan	KLM
25 Dec - 01 Jan	Discover Airlines	direct
27 Dec - 04 Jan	Lufthansa	direct
20 Dec - 03 Jan	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 563€

Return flights