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

Return flights

01 Sep - 06 Sep	LATAM Airlines Group
05 Sep - 25 Sep	Avianca
08 Sep - 21 Sep	Avianca
16 Sep - 23 Sep	Avianca
11 Sep - 02 Oct	Avianca
13 Sep - 02 Oct	Avianca
13 Sep - 04 Oct	Avianca
30 Sep - 11 Oct	Avianca
13 Sep - 20 Sep	Avianca
24 Sep - 29 Sep	Avianca
11 Sep - 16 Sep	Avianca
09 Sep - 18 Sep	Avianca
16 Sep - 27 Sep	Avianca
19 Sep - 24 Sep	Avianca
30 Sep - 06 Oct	Avianca
25 Sep - 02 Oct	Avianca
25 Sep - 07 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 305€

Return flights