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

Return flights

21 Dec - 07 Jan	Alaska Airlines
15 Dec - 05 Jan	LATAM Airlines Group
22 Dec - 06 Jan	LATAM Airlines Group
22 Dec - 07 Jan	LATAM Airlines Group
19 Dec - 07 Jan	Volaris
15 Dec - 04 Jan	LATAM Airlines Group
22 Dec - 05 Jan	LATAM Airlines Group
19 Dec - 06 Jan	Volaris
20 Dec - 07 Jan	LATAM Airlines Group

Also check the deals for one-way flights from San Jose 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 San Jose to Buenos Aires in December from $1829

Return flights