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

Return flights

02 Dec - 17 Dec	GOL Linhas Aéreas
01 Dec - 15 Dec	GOL Linhas Aéreas
06 Dec - 16 Dec	GOL Linhas Aéreas
18 Dec - 04 Jan	LATAM Airlines Group
30 Dec - 06 Jan	LATAM Airlines Group
30 Dec - 09 Jan	LATAM Airlines Group
20 Dec - 20 Jan	JetSmart
29 Dec - 13 Jan	Flybondi
27 Dec - 09 Jan	LATAM Airlines Group
29 Dec - 01 Jan	Sky Airline
25 Dec - 11 Jan	Avianca
25 Dec - 07 Jan	Sky Airline
30 Dec - 18 Jan	LATAM Airlines Group

Also check the deals for one-way flights from Buenos Aires to San Jose 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 Buenos Aires to San Jose in December from $536

Return flights