AirHint found the following cheapest return flights from Rio De Janeiro (SDU) to Porto (OPO) in September 2025 (see full year).

Return flights

29 Sep - 20 Oct	Azul Airlines
01 Sep - 08 Sep	Azul Airlines
25 Sep - 04 Oct	Azul Airlines
12 Sep - 15 Sep	LATAM Airlines Group
11 Sep - 14 Sep	LATAM Airlines Group
02 Sep - 09 Sep	LATAM Airlines Group

Also check the deals for one-way flights from Rio De Janeiro to Porto 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 Rio De Janeiro to Porto in September from $997

Return flights