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

Return flights

04 Dec - 28 Jan	LATAM Airlines Group
01 Dec - 15 Dec	LATAM Airlines Group
07 Dec - 15 Dec	LATAM Airlines Group
01 Dec - 12 Dec	LATAM Airlines Group
01 Dec - 14 Dec	LATAM Airlines Group
08 Dec - 15 Dec	LATAM Airlines Group
01 Dec - 16 Dec	LATAM Airlines Group
04 Dec - 10 Dec	Azul Airlines
09 Dec - 15 Dec	Azul Airlines
21 Dec - 19 Jan	TAAG Angola Airlines
05 Dec - 21 Jan	Azul Airlines
01 Dec - 31 Dec	Azul Airlines
09 Dec - 13 Jan	Azul Airlines
01 Dec - 29 Dec	Azul Airlines
23 Dec - 12 Jan	TAAG Angola Airlines
09 Dec - 12 Jan	Azul Airlines
07 Dec - 19 Jan	Vueling Airlines
23 Dec - 26 Jan	LATAM Airlines Group
04 Dec - 15 Jan	LATAM Airlines Group
26 Dec - 23 Jan	LATAM Airlines Group

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 $1050

Return flights