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

Return flights

01 Dec - 15 Dec	LATAM Airlines Group
05 Dec - 19 Dec	LATAM Airlines Group
03 Dec - 22 Dec	Avianca
10 Dec - 16 Dec	Copa
05 Dec - 21 Dec	LATAM Airlines Group
17 Dec - 29 Dec	LATAM Airlines Group
24 Dec - 31 Jan	Copa
04 Dec - 20 Dec	GOL Linhas Aéreas
26 Dec - 08 Jan	Avianca
24 Dec - 31 Dec	Copa
25 Dec - 01 Jan	Copa
26 Dec - 14 Jan	Avianca
31 Dec - 12 Jan	Copa
29 Dec - 12 Jan	Copa
25 Dec - 11 Jan	Copa
30 Dec - 06 Jan	Avianca
29 Dec - 03 Jan	Avianca
24 Dec - 02 Jan	Copa

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 $538

Return flights