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

Return flights

01 Dec - 22 Dec	Delta
24 Dec - 19 Jan	Delta
24 Dec - 12 Jan	Delta
27 Dec - 15 Jan	Delta
23 Dec - 26 Jan	Delta
23 Dec - 08 Jan	Delta
23 Dec - 19 Jan	Delta
01 Dec - 06 Dec	Delta
30 Dec - 18 Jan	Iberia For Level
27 Dec - 10 Jan	Delta
26 Dec - 05 Jan	Iberia For Level
01 Dec - 31 Dec	LATAM Airlines Group
25 Dec - 05 Jan	Iberia For Level
05 Dec - 20 Dec	LATAM Airlines Group
20 Dec - 27 Dec	Iberia For Level
14 Dec - 15 Dec	Air Europa
01 Dec - 01 Dec	Air France

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 833€

Return flights