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

Return flights

05 Sep - 13 Sep	Spirit Airlines
05 Sep - 16 Sep	Spirit Airlines
05 Sep - 08 Sep	Spirit Airlines
09 Sep - 13 Sep	Spirit Airlines
09 Sep - 16 Sep	Spirit Airlines
10 Sep - 13 Sep	Spirit Airlines
10 Sep - 16 Sep	Spirit Airlines
09 Sep - 25 Sep	Delta
22 Sep - 26 Sep	United
05 Sep - 26 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 295€

Return flights