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

Return flights

16 Sep - 26 Sep	Avianca
04 Sep - 13 Sep	Spirit Airlines
04 Sep - 06 Sep	Spirit Airlines
05 Sep - 13 Sep	Spirit Airlines
05 Sep - 06 Sep	Spirit Airlines
17 Sep - 03 Oct	Spirit Airlines
14 Sep - 03 Oct	Spirit Airlines
04 Sep - 12 Sep	Spirit Airlines
04 Sep - 11 Sep	Spirit Airlines
04 Sep - 10 Sep	Spirit Airlines
05 Sep - 11 Sep	Spirit Airlines
05 Sep - 10 Sep	Spirit Airlines
26 Sep - 03 Oct	Spirit Airlines
15 Sep - 03 Oct	Spirit Airlines
26 Sep - 13 Oct	Spirit Airlines

Also check the deals for one-way flights from San Juan 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 Juan to San Jose in September from $233

Return flights