AirHint found the following cheapest return flights from Sao Paulo (GRU) to Porto (OPO) in September 2026 (see full year).

Return flights

28 Sep - 27 Oct	British Airways
29 Sep - 12 Oct	British Airways
30 Sep - 15 Oct	Iberia
16 Sep - 20 Sep	Royal Air Maroc
25 Sep - 10 Oct	Royal Air Maroc
16 Sep - 04 Oct	Royal Air Maroc
16 Sep - 02 Oct	Royal Air Maroc
24 Sep - 20 Oct	Iberia
27 Sep - 12 Oct	Iberia
15 Sep - 29 Sep	Iberia
21 Sep - 28 Sep	Iberia
24 Sep - 09 Oct	Iberia
14 Sep - 28 Sep	Iberia
08 Sep - 15 Sep	Iberia
08 Sep - 22 Sep	Iberia
06 Sep - 16 Sep	British Airways
08 Sep - 19 Sep	Iberia
14 Sep - 21 Sep	Iberia
19 Sep - 01 Oct	Iberia
08 Sep - 25 Sep	Iberia

Also check the deals for one-way flights from Sao Paulo 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 Sao Paulo to Porto in September from 613€

Return flights