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

Return flights

05 Dec - 08 Dec	Iberia
05 Dec - 30 Dec	LATAM Airlines Group
01 Dec - 15 Dec	LATAM Airlines Group
06 Dec - 30 Dec	LATAM Airlines Group
01 Dec - 18 Jan	Vueling Airlines
24 Dec - 17 Jan	Azul Airlines
22 Dec - 13 Jan	Ryanair
19 Dec - 27 Dec	Ryanair
22 Dec - 10 Jan	Ryanair
21 Dec - 06 Jan	Ryanair
04 Dec - 08 Jan	Ryanair
27 Dec - 06 Jan	Ryanair
22 Dec - 06 Jan	Ryanair
20 Dec - 06 Jan	Ryanair
20 Dec - 10 Jan	TAP
21 Dec - 28 Dec	LATAM Airlines Group

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 957€

Return flights