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

Return flights

24 Sep - 29 Sep	Copa
13 Sep - 20 Sep	Avianca
18 Sep - 25 Sep	Avianca
09 Sep - 18 Sep	Avianca
05 Sep - 18 Sep	Avianca
05 Sep - 11 Sep	Avianca
01 Sep - 08 Sep	Avianca
13 Sep - 22 Sep	Avianca
03 Sep - 17 Sep	Avianca
04 Sep - 13 Sep	Avianca
30 Sep - 06 Oct	Avianca
23 Sep - 04 Oct	Avianca
26 Sep - 03 Oct	Avianca
28 Sep - 02 Oct	Avianca
30 Sep - 04 Oct	Avianca

Also check the deals for one-way flights from Sao Paulo 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 Sao Paulo to San Jose in September from 307€

Return flights