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

Return flights

22 Sep - 31 Oct	Air Europa
24 Sep - 26 Oct	Air Europa
23 Sep - 19 Oct	Air Europa
24 Sep - 23 Oct	TAP
24 Sep - 24 Oct	Air Europa
24 Sep - 25 Oct	Air Europa
26 Sep - 14 Oct	Air Europa
06 Sep - 19 Oct	Air Europa
09 Sep - 02 Oct	Air Europa
10 Sep - 01 Oct	Air Europa
22 Sep - 30 Sep	Air Europa
23 Sep - 30 Sep	Air Europa
09 Sep - 30 Sep	Air Europa
20 Sep - 30 Sep	Air Europa
18 Sep - 30 Sep	Air Europa
11 Sep - 30 Sep	Air Europa
04 Sep - 30 Sep	Air Europa
16 Sep - 29 Sep	Air Europa
16 Sep - 30 Sep	Air Europa
02 Sep - 30 Sep	Air Europa

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 520€

Return flights