AirHint found the following cheapest return flights from San Francisco (SFO) to Cluj-napoca (CLJ) in December 2025 (see full year).

Return flights

31 Dec - 21 Jan	Lufthansa
30 Dec - 20 Jan	Lufthansa
09 Dec - 16 Dec	Lufthansa
09 Dec - 23 Dec	Lufthansa
07 Dec - 23 Dec	Lufthansa
30 Dec - 27 Jan	Lufthansa
31 Dec - 19 Jan	Lufthansa
08 Dec - 22 Dec	Lufthansa
08 Dec - 15 Dec	Lufthansa
08 Dec - 25 Dec	Lufthansa
02 Dec - 16 Dec	Lufthansa
05 Dec - 15 Dec	Lufthansa
02 Dec - 09 Dec	Lufthansa
26 Dec - 16 Jan	Lufthansa
09 Dec - 08 Jan	Lufthansa
10 Dec - 17 Dec	Lufthansa
24 Dec - 14 Jan	Lufthansa
23 Dec - 15 Jan	Lufthansa
23 Dec - 13 Jan	Lufthansa
24 Dec - 07 Jan	Lufthansa

Also check the deals for one-way flights from San Francisco to Cluj-napoca 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 Cluj-napoca in December from $414

Return flights