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

Return flights

23 Sep - 30 Sep	Spirit Airlines
19 Sep - 22 Sep	United
26 Sep - 28 Sep	United
30 Sep - 04 Oct	Spirit Airlines
04 Sep - 07 Sep	Spirit Airlines
13 Sep - 15 Sep	Spirit Airlines
13 Sep - 21 Sep	Spirit Airlines
29 Sep - 03 Oct	Spirit Airlines
12 Sep - 14 Sep	Frontier Airlines
22 Sep - 03 Oct	Spirit Airlines
12 Sep - 03 Oct	Spirit Airlines
20 Sep - 27 Sep	Spirit Airlines
11 Sep - 15 Sep	Frontier Airlines
19 Sep - 03 Oct	Spirit Airlines
11 Sep - 11 Oct	Frontier Airlines
26 Sep - 03 Oct	Spirit Airlines

Also check the deals for one-way flights from Los Angeles 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 Los Angeles to San Jose in September from 275€

Return flights