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

Return flights

11 Sep - 24 Sep	Copa
23 Sep - 28 Sep	Copa
24 Sep - 28 Sep	Copa
15 Sep - 24 Sep	Hawaiian Airlines
30 Sep - 05 Oct	Hawaiian Airlines
06 Sep - 13 Sep	Alaska Airlines
15 Sep - 24 Sep	United	direct
11 Sep - 24 Sep	United	direct
07 Sep - 14 Sep	United	direct
05 Sep - 14 Sep	United	direct
06 Sep - 13 Sep	United	direct
30 Sep - 05 Oct	United	direct

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

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 September from 351€

Return flights