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 - 22 Sep	Copa
26 Sep - 29 Sep	Avianca
12 Sep - 19 Sep	Avianca	direct
05 Sep - 12 Sep	Avianca
15 Sep - 22 Sep	Avianca	direct
05 Sep - 15 Sep	Avianca
05 Sep - 14 Sep	Avianca
06 Sep - 15 Sep	Avianca
01 Sep - 05 Sep	Avianca
19 Sep - 22 Sep	Avianca	direct
26 Sep - 03 Oct	Avianca

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 160€

Return flights