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

Return flights

03 Sep - 21 Sep	Copa
16 Sep - 25 Sep	Copa
04 Sep - 09 Sep	Copa
12 Sep - 21 Sep	Avianca
13 Sep - 20 Sep	Avianca
01 Sep - 05 Sep	Avianca
02 Sep - 06 Sep	Avianca
15 Sep - 24 Sep	Avianca
04 Sep - 11 Sep	GOL Linhas Aéreas	direct
04 Sep - 09 Sep	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 321€

Return flights