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

Return flights

12 Sep - 16 Sep	Azul Airlines
08 Sep - 16 Sep	GOL Linhas Aéreas
14 Sep - 21 Sep	GOL Linhas Aéreas	direct
14 Sep - 20 Sep	GOL Linhas Aéreas
18 Sep - 24 Sep	LATAM Airlines Group	direct
08 Sep - 12 Sep	GOL Linhas Aéreas	direct
07 Sep - 15 Sep	LATAM Airlines Group	direct
21 Sep - 03 Oct	LATAM Airlines Group
12 Sep - 12 Oct	Azul Airlines
23 Sep - 29 Sep	LATAM Airlines Group

Also check the deals for one-way flights from Sao Paulo to Asuncion 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 Asuncion in September from $191

Return flights