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

Return flights

09 Dec - 16 Dec	United	direct
31 Dec - 14 Jan	Delta
14 Dec - 23 Dec	United	direct
16 Dec - 14 Jan	United	direct
28 Dec - 11 Jan	Scandinavian Airlines
23 Dec - 29 Dec	Lufthansa
23 Dec - 28 Dec	United
24 Dec - 28 Dec	United
31 Dec - 14 Jan	United	direct
29 Dec - 05 Jan	Lufthansa
28 Dec - 11 Jan	United	direct
24 Dec - 04 Jan	TAP
22 Dec - 27 Dec	TAP
23 Dec - 27 Dec	SWISS
21 Dec - 27 Dec	SWISS
23 Dec - 03 Jan	Delta
19 Dec - 26 Dec	Lufthansa	direct
20 Dec - 28 Dec	Scandinavian Airlines
18 Dec - 03 Jan	Condor
18 Dec - 03 Jan	United	direct

Also check the deals for one-way flights from San Francisco 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 San Francisco to Frankfurt in December from 631€

Return flights