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

Return flights

22 Sep - 28 Sep	Avianca
18 Sep - 25 Sep	Avianca
10 Sep - 14 Sep	Avianca
11 Sep - 18 Sep	Avianca
12 Sep - 19 Sep	Avianca
30 Sep - 06 Oct	Avianca
20 Sep - 28 Sep	Copa
16 Sep - 20 Sep	Copa
17 Sep - 21 Sep	Copa
22 Sep - 09 Oct	Copa
22 Sep - 29 Sep	Copa
23 Sep - 30 Sep	Copa
26 Sep - 03 Oct	Copa

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 284€

Return flights