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

Return flights

14 Oct - 11 Nov	Iberia
26 Oct - 10 Nov	Iberia
25 Oct - 10 Nov	Iberia
22 Oct - 10 Nov	Iberia
26 Oct - 28 Nov	Iberia
20 Oct - 10 Nov	Iberia
16 Oct - 13 Nov	Iberia
30 Oct - 13 Nov	Iberia
28 Oct - 30 Nov	Iberia
15 Oct - 30 Nov	Iberia
14 Oct - 24 Oct	TAP
03 Oct - 10 Oct	TAAG Angola Airlines
17 Oct - 31 Oct	TAP
16 Oct - 31 Oct	TAP
13 Oct - 24 Oct	TAP
07 Oct - 23 Oct	TAP
19 Oct - 29 Oct	TAP
03 Oct - 19 Oct	TAAG Angola Airlines
10 Oct - 19 Oct	TAAG Angola Airlines
16 Oct - 29 Oct	Air Europa

Also check the deals for one-way flights from Sao Paulo to Porto in October.

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 October from $639

Return flights