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

Return flights

08 Dec - 14 Dec	Ethiopian Airlines
08 Dec - 13 Dec	Ethiopian Airlines
01 Dec - 04 Dec	Ethiopian Airlines
15 Dec - 06 Jan	Ethiopian Airlines
01 Dec - 11 Jan	Ethiopian Airlines
02 Dec - 11 Jan	Ethiopian Airlines
20 Dec - 03 Jan	Ethiopian Airlines
27 Dec - 03 Jan	Ethiopian Airlines
18 Dec - 08 Jan	Ethiopian Airlines
01 Dec - 04 Jan	Ethiopian Airlines
03 Dec - 06 Dec	Lufthansa
03 Dec - 14 Jan	Iberia
11 Dec - 31 Dec	SWISS
03 Dec - 11 Jan	Iberia
23 Dec - 17 Jan	SWISS

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

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 December from $981

Return flights