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

Return flights

01 Dec - 29 Dec	Delta
08 Dec - 24 Jan	Delta
25 Dec - 22 Jan	Delta
09 Dec - 12 Jan	Delta
24 Dec - 12 Jan	Delta
30 Dec - 18 Jan	Delta
08 Dec - 12 Jan	Delta
31 Dec - 19 Jan	Delta
31 Dec - 18 Jan	Delta
10 Dec - 19 Jan	Delta
10 Dec - 12 Jan	Delta
05 Dec - 08 Dec	Delta
04 Dec - 10 Dec	Lufthansa
03 Dec - 10 Dec	Vueling Airlines
05 Dec - 11 Dec	Air Europa
01 Dec - 15 Dec	Lufthansa
01 Dec - 12 Dec	Lufthansa
06 Dec - 13 Dec	LATAM Airlines Group
07 Dec - 16 Dec	Air Europa
07 Dec - 17 Dec	Air Europa

Also check the deals for one-way flights from Lisbon 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 Lisbon to Buenos Aires in December from $969

Return flights