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

Return flights

30 Sep - 18 Oct	Ethiopian Airlines
08 Sep - 24 Sep	SWISS
01 Sep - 17 Oct	Air France
02 Sep - 17 Sep	SWISS
03 Sep - 17 Sep	TAP
01 Sep - 17 Sep	Air France
15 Sep - 25 Sep	KLM
22 Sep - 13 Oct	TAP
03 Sep - 23 Sep	Lufthansa
06 Sep - 22 Sep	KLM
07 Sep - 14 Sep	Air Europa
03 Sep - 07 Sep	Air Europa

Also check the deals for one-way flights from Porto to Buenos Aires 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 Buenos Aires in September from 851€

Return flights