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

Return flights

04 Dec - 10 Dec	LATAM Airlines Group
01 Dec - 09 Dec	Avianca
01 Dec - 10 Dec	Avianca
01 Dec - 15 Dec	Avianca
01 Dec - 08 Dec	Avianca
01 Dec - 11 Dec	Avianca
12 Dec - 12 Jan	Avianca
23 Dec - 10 Jan	Avianca
18 Dec - 04 Jan	Avianca
23 Dec - 31 Dec	Avianca
01 Dec - 01 Jan	Avianca
23 Dec - 12 Jan	Avianca
24 Dec - 04 Jan	Avianca
19 Dec - 04 Jan	LATAM Airlines Group
30 Dec - 09 Jan	LATAM Airlines Group
27 Dec - 15 Jan	Avianca
27 Dec - 09 Jan	Avianca

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 $487

Return flights