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

Return flights

24 Sep - 01 Oct	United
10 Sep - 24 Sep	United
09 Sep - 25 Sep	United
04 Sep - 07 Sep	Spirit Airlines
04 Sep - 24 Sep	Spirit Airlines
06 Sep - 24 Sep	Spirit Airlines
04 Sep - 14 Sep	Spirit Airlines
06 Sep - 14 Sep	Spirit Airlines
10 Sep - 01 Oct	Spirit Airlines
10 Sep - 14 Sep	Spirit Airlines
21 Sep - 01 Oct	Spirit Airlines
21 Sep - 24 Sep	Spirit Airlines

Also check the deals for one-way flights from San Diego 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 Diego to San Jose in September from 324€

Return flights