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

Return flights

03 Dec - 09 Dec	TAP
29 Dec - 10 Jan	Scandinavian Airlines
08 Dec - 22 Dec	TAP
07 Dec - 14 Dec	Scandinavian Airlines
01 Dec - 26 Dec	TAP
11 Dec - 07 Jan	Scandinavian Airlines
11 Dec - 01 Jan	Scandinavian Airlines
07 Dec - 27 Dec	Scandinavian Airlines
11 Dec - 25 Dec	Hawaiian Airlines
11 Dec - 13 Dec	Condor
15 Dec - 10 Jan	TAP
15 Dec - 22 Dec	TAP
15 Dec - 27 Dec	TAP
17 Dec - 21 Dec	TAP
09 Dec - 03 Jan	Flair Airlines
24 Dec - 04 Jan	TAP
08 Dec - 03 Jan	TAP
17 Dec - 01 Jan	Icelandair
11 Dec - 07 Jan	United	direct
15 Dec - 10 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 $550

Return flights