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

Return flights

11 Dec - 18 Jan	Spirit Airlines
14 Dec - 18 Jan	Frontier Airlines
30 Dec - 13 Jan	Frontier Airlines
09 Dec - 15 Jan	Aer Lingus
15 Dec - 23 Dec	Frontier Airlines
28 Dec - 06 Jan	United
23 Dec - 30 Dec	Air Canada
25 Dec - 30 Dec	United	direct
20 Dec - 28 Dec	Frontier Airlines
16 Dec - 31 Dec	Frontier Airlines
23 Dec - 04 Jan	Spirit Airlines
23 Dec - 30 Dec	Lufthansa	direct
16 Dec - 18 Dec	Aer Lingus
09 Dec - 15 Jan	Lufthansa	direct
11 Dec - 18 Jan	Lufthansa	direct
19 Dec - 01 Jan	Frontier Airlines
13 Dec - 20 Dec	United	direct
16 Dec - 23 Dec	Lufthansa	direct
15 Dec - 19 Dec	Air Canada
22 Dec - 03 Jan	Frontier 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 830€

Return flights