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

Return flights

02 Dec - 07 Dec	Ryanair
02 Dec - 06 Dec	Ryanair
01 Dec - 06 Dec	Ryanair
06 Dec - 08 Dec	Ryanair
01 Dec - 11 Dec	Ryanair
02 Dec - 12 Dec	Ryanair
04 Dec - 27 Jan	Ryanair
01 Dec - 15 Dec	TAP
01 Dec - 12 Dec	Ryanair
31 Dec - 15 Jan	TAP
23 Dec - 16 Jan	Ryanair
23 Dec - 17 Jan	Ryanair
15 Dec - 20 Jan	Ryanair
18 Dec - 28 Jan	LATAM Airlines Group
23 Dec - 12 Jan	Ryanair
26 Dec - 16 Jan	Ryanair
26 Dec - 14 Jan	Ryanair
06 Dec - 30 Dec	Ryanair
16 Dec - 20 Jan	Iberia
24 Dec - 28 Dec	TAP

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 896€

Return flights