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

Return flights

17 Aug - 26 Aug	Hawaiian Airlines
14 Aug - 19 Aug	Frontier Airlines
11 Aug - 25 Aug	Alaska Airlines
10 Aug - 15 Aug	Alaska Airlines
06 Aug - 12 Aug	Frontier Airlines
18 Aug - 25 Aug	Hawaiian Airlines
03 Aug - 13 Aug	Frontier Airlines
15 Aug - 22 Aug	Alaska Airlines
17 Aug - 25 Aug	Hawaiian Airlines
21 Aug - 24 Aug	Frontier Airlines
04 Aug - 04 Sep	Frontier Airlines
04 Aug - 04 Sep	United	direct

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

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 August from 369€

Return flights