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 - 06 Oct	Avianca
25 Sep - 02 Oct	Avianca
25 Sep - 07 Oct	Avianca
09 Sep - 18 Sep	Copa
14 Sep - 20 Sep	Copa
06 Sep - 15 Sep	Copa
13 Sep - 20 Sep	Copa
19 Sep - 24 Sep	Copa
20 Sep - 25 Sep	Copa
06 Sep - 20 Sep	Copa
18 Sep - 20 Sep	Copa
19 Sep - 21 Sep	Copa
28 Sep - 11 Oct	Copa
23 Sep - 02 Oct	Copa
20 Sep - 04 Oct	Copa
27 Sep - 04 Oct	Copa
26 Sep - 03 Oct	Copa
25 Sep - 03 Oct	Copa
25 Sep - 04 Oct	GOL Linhas Aéreas	direct
05 Sep - 18 Sep	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 $334

Return flights