AirHint found the following cheapest return flights from San Francisco (SFO) to San Jose (SJO) in January 2026 (see full year).

Return flights

14 Jan - 19 Jan	Avianca
16 Jan - 30 Jan	Frontier Airlines
09 Jan - 25 Jan	Avianca
21 Jan - 04 Feb	Avianca
18 Jan - 25 Jan	Avianca
20 Jan - 04 Feb	Avianca
23 Jan - 04 Feb	Avianca
24 Jan - 04 Feb	Avianca
22 Jan - 04 Feb	Avianca
30 Jan - 08 Feb	Avianca
31 Jan - 08 Feb	Avianca
12 Jan - 26 Jan	Frontier Airlines
16 Jan - 21 Jan	Frontier Airlines
31 Jan - 23 Feb	Avianca
21 Jan - 28 Jan	Avianca
06 Jan - 27 Jan	Frontier Airlines
08 Jan - 12 Jan	Frontier Airlines
08 Jan - 16 Jan	Frontier Airlines
30 Jan - 08 Feb	United	direct
31 Jan - 08 Feb	United	direct

Also check the deals for one-way flights from San Francisco to San Jose in January.

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 January from 294€

Return flights