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

Return flights

19 Aug - 26 Aug	TAP
31 Aug - 17 Sep	TAP
29 Aug - 14 Sep	Air Europa
29 Aug - 11 Sep	Air Europa
09 Aug - 16 Aug	TAP
13 Aug - 20 Aug	TAP
14 Aug - 21 Aug	TAP
30 Aug - 17 Sep	TAP
16 Aug - 30 Aug	Air Europa
29 Aug - 17 Sep	TAP
11 Aug - 19 Aug	TAP
17 Aug - 30 Aug	TAP
15 Aug - 31 Aug	TAP
09 Aug - 14 Aug	TAP
16 Aug - 01 Sep	TAP
15 Aug - 29 Aug	TAP
31 Aug - 12 Sep	Vueling Airlines

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 941€

Return flights