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

Return flights

19 Sep - 26 Sep	Avianca	direct
02 Sep - 08 Sep	Avianca
26 Sep - 03 Oct	Avianca
26 Sep - 29 Sep	Copa
11 Sep - 18 Sep	Copa
08 Sep - 12 Sep	Copa
05 Sep - 07 Sep	Avianca
06 Sep - 11 Sep	Avianca
26 Sep - 03 Oct	Avianca	direct
05 Sep - 13 Sep	Avianca
22 Sep - 06 Oct	Spirit Airlines
22 Sep - 10 Oct	Spirit Airlines
22 Sep - 11 Oct	Spirit Airlines
11 Sep - 15 Sep	Copa
21 Sep - 06 Oct	Spirit Airlines
21 Sep - 10 Oct	Spirit Airlines
21 Sep - 11 Oct	Spirit Airlines
01 Sep - 08 Sep	Copa

Also check the deals for one-way flights from San Jose to San Juan 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 Jose to San Juan in September from $214

Return flights