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

Return flights

28 Sep - 09 Oct	TAP
25 Sep - 17 Oct	TAP
25 Sep - 16 Oct	TAP
16 Sep - 29 Sep	TAP
29 Sep - 16 Oct	TAP
30 Sep - 14 Oct	TAP
19 Sep - 04 Oct	TAP
19 Sep - 22 Sep	TAP
08 Sep - 16 Sep	TAP
30 Sep - 30 Oct	TAP
06 Sep - 22 Sep	TAP
23 Sep - 16 Oct	TAP
24 Sep - 15 Oct	TAP
09 Sep - 17 Sep	TAP
30 Sep - 17 Oct	TAP
10 Sep - 30 Sep	TAP
18 Sep - 29 Sep	TAP
10 Sep - 20 Sep	TAP
09 Sep - 23 Sep	TAP
09 Sep - 24 Sep	TAP

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 $667

Return flights