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

Return flights

19 Aug - 23 Aug	TAP
18 Aug - 23 Aug	TAP
30 Aug - 15 Sep	TAP
26 Aug - 17 Sep	TAP
14 Aug - 21 Aug	Ryanair
21 Aug - 28 Aug	Ryanair
29 Aug - 13 Sep	TAP
11 Aug - 19 Aug	TAP
18 Aug - 31 Aug	TAP
04 Aug - 10 Aug	TAP
31 Aug - 12 Sep	Vueling Airlines
02 Aug - 10 Aug	Iberia
01 Aug - 10 Aug	Azul Airlines
02 Aug - 09 Aug	TAP

Also check the deals for one-way flights from Porto to Buenos Aires in August.

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 August from $1237

Return flights