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
04 Dec - 11 Dec	Ryanair
02 Dec - 14 Dec	SWISS
01 Dec - 09 Dec	LATAM Airlines Group
08 Dec - 27 Dec	Delta
05 Dec - 27 Dec	Delta
31 Dec - 19 Jan	Delta
31 Dec - 18 Jan	Delta
04 Dec - 28 Jan	Delta
31 Dec - 28 Jan	Delta
10 Dec - 19 Jan	Delta
01 Dec - 12 Dec	LATAM Airlines Group
05 Dec - 09 Dec	Delta
03 Dec - 15 Jan	Delta
24 Dec - 11 Jan	Delta
25 Dec - 15 Jan	Delta
25 Dec - 11 Jan	Delta
09 Dec - 12 Jan	Delta
07 Dec - 14 Dec	LATAM Airlines Group
04 Dec - 10 Dec	easyJet

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 836€

Return flights