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

Return flights

12 Dec - 20 Dec	Avianca
05 Dec - 12 Dec	Avianca
16 Dec - 29 Dec	Avianca
08 Dec - 12 Dec	Copa
01 Dec - 10 Jan	Copa
19 Dec - 05 Jan	Avianca
24 Dec - 08 Jan	Copa
11 Dec - 21 Dec	Avianca
25 Dec - 05 Jan	Avianca
21 Dec - 10 Jan	Avianca
21 Dec - 28 Dec	Avianca
08 Dec - 18 Dec	Copa
08 Dec - 19 Dec	Copa
31 Dec - 09 Jan	Avianca
26 Dec - 08 Jan	Avianca
30 Dec - 13 Jan	Avianca
27 Dec - 09 Jan	Avianca
30 Dec - 12 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 $552

Return flights