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

Return flights

05 Sep - 12 Sep	Avianca
05 Sep - 14 Sep	Avianca
23 Sep - 26 Sep	Avianca
26 Sep - 29 Sep	Avianca
26 Sep - 02 Oct	Avianca
30 Sep - 03 Oct	Avianca
29 Sep - 02 Oct	Avianca	direct
01 Sep - 05 Sep	Avianca
21 Sep - 26 Sep	Avianca
23 Sep - 29 Sep	Spirit Airlines
29 Sep - 06 Oct	Spirit Airlines
23 Sep - 06 Oct	Spirit Airlines
23 Sep - 02 Oct	Spirit Airlines
21 Sep - 29 Sep	Spirit Airlines
30 Sep - 06 Oct	Spirit Airlines
30 Sep - 02 Oct	Spirit Airlines
21 Sep - 06 Oct	Spirit Airlines
21 Sep - 02 Oct	Spirit Airlines
21 Sep - 23 Sep	Spirit Airlines
01 Sep - 18 Sep	Spirit Airlines

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 180€

Return flights