AirHint found the following cheapest return flights from Porto (OPO) to Buenos Aires (AEP) in October 2025 (see full year).

Return flights

21 Oct - 29 Oct	Azul Airlines
16 Oct - 23 Oct	Ryanair
12 Oct - 19 Oct	Royal Air Maroc
31 Oct - 22 Nov	TAP
13 Oct - 27 Oct	Ryanair
31 Oct - 07 Nov	TAP
15 Oct - 31 Oct	Air Europa
01 Oct - 29 Oct	Air Europa
13 Oct - 20 Oct	Ryanair
21 Oct - 26 Oct	Azul Airlines
16 Oct - 04 Nov	Azul Airlines
26 Oct - 14 Nov	TAP
03 Oct - 11 Oct	Air Europa
17 Oct - 24 Oct	TAP
02 Oct - 01 Nov	TAP

Also check the deals for one-way flights from Porto to Buenos Aires 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 Porto to Buenos Aires in October from 887€

Return flights