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

Return flights

01 Dec - 07 Dec	TAP
03 Dec - 06 Dec	Lufthansa
04 Dec - 11 Dec	TAP
04 Dec - 09 Dec	TAP
01 Dec - 06 Dec	Ryanair
04 Dec - 29 Jan	LATAM Airlines Group
04 Dec - 07 Dec	TAP
03 Dec - 07 Dec	TAP
05 Dec - 08 Dec	Air Europa
01 Dec - 11 Dec	TAP
02 Dec - 07 Dec	TAP
26 Dec - 29 Jan	LATAM Airlines Group
04 Dec - 26 Jan	LATAM Airlines Group
24 Dec - 25 Jan	TAP
31 Dec - 17 Jan	Ryanair
02 Dec - 15 Jan	easyJet
18 Dec - 22 Jan	TAP
31 Dec - 14 Jan	Ryanair
30 Dec - 17 Jan	TAP
31 Dec - 15 Jan	Ryanair

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.

Book a cheap hotel in Buenos Aires

Cheap car rent in Buenos Aires

Cheapest return flights from Porto to Buenos Aires in December from $1089

Return flights