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

Return flights

28 Sep - 17 Oct	Arajet
01 Sep - 09 Sep	Arajet
09 Sep - 23 Sep	Avianca
16 Sep - 23 Sep	GOL Linhas Aéreas
19 Sep - 25 Sep	United
13 Sep - 20 Sep	Avianca
05 Sep - 12 Sep	Avianca
15 Sep - 22 Sep	Avianca
01 Sep - 08 Sep	Avianca
09 Sep - 21 Sep	Avianca
26 Sep - 28 Sep	Copa

Also check the deals for one-way flights from Sao Paulo to San Juan 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 Juan in September from 368€

Return flights