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

Return flights

24 Sep - 25 Oct	Air Europa
11 Sep - 30 Sep	TAP
22 Sep - 07 Oct	Air Europa
19 Sep - 07 Oct	Air Europa
20 Sep - 07 Oct	Air Europa
07 Sep - 18 Oct	Air Europa
19 Sep - 02 Oct	Air Europa
09 Sep - 30 Sep	TAP
09 Sep - 23 Sep	TAP
06 Sep - 19 Oct	TAP
04 Sep - 21 Oct	TAP
03 Sep - 28 Oct	TAP
16 Sep - 23 Sep	TAP
11 Sep - 18 Sep	TAP
10 Sep - 18 Sep	TAP
02 Sep - 30 Oct	Air Europa
12 Sep - 23 Sep	Air Europa
15 Sep - 30 Sep	TAP
17 Sep - 24 Sep	TAP
03 Sep - 18 Sep	TAP

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

Return flights