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

Return flights

01 Sep - 30 Sep	Avianca
04 Sep - 11 Sep	Avianca
23 Sep - 30 Sep	Copa
04 Sep - 15 Sep	Copa
05 Sep - 21 Sep	Copa
05 Sep - 14 Sep	Copa
10 Sep - 15 Sep	Copa
11 Sep - 17 Sep	Copa
22 Sep - 29 Sep	Copa
15 Sep - 19 Sep	Copa
29 Sep - 11 Oct	Copa
29 Sep - 04 Oct	Copa
22 Sep - 01 Oct	Copa
28 Sep - 04 Oct	Copa
30 Sep - 14 Oct	Copa
23 Sep - 04 Oct	GOL Linhas Aéreas	direct

Also check the deals for one-way flights from San Jose to Sao Paulo 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 Sao Paulo in September from $339

Return flights