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

Return flights

05 Dec - 08 Dec	Frontier Airlines
12 Dec - 12 Jan	Frontier Airlines
13 Dec - 21 Dec	Alaska Airlines
16 Dec - 31 Dec	American Airlines
05 Dec - 08 Dec	United	direct
24 Dec - 31 Dec	Aeromexico
17 Dec - 21 Dec	Hawaiian Airlines
26 Dec - 05 Jan	Avianca
24 Dec - 28 Dec	Aeromexico
17 Dec - 26 Dec	Frontier Airlines
26 Dec - 31 Dec	Avianca
23 Dec - 31 Dec	Aeromexico
25 Dec - 07 Jan	Alaska Airlines
18 Dec - 01 Jan	Alaska Airlines
26 Dec - 03 Jan	Avianca
27 Dec - 04 Jan	Avianca
26 Dec - 02 Jan	Avianca
25 Dec - 02 Jan	Alaska Airlines
26 Dec - 04 Jan	Avianca
18 Dec - 02 Jan	Frontier Airlines

Also check the deals for one-way flights from San Francisco to San Jose 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 San Jose in December from 337€

Return flights