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 - 05 Dec	Avianca
02 Dec - 09 Dec	Avianca
04 Dec - 09 Dec	Avianca
04 Dec - 10 Dec	Avianca
05 Dec - 11 Dec	Avianca
03 Dec - 11 Dec	Avianca
07 Dec - 17 Dec	Copa
06 Dec - 15 Dec	Copa
06 Dec - 12 Dec	Copa
06 Dec - 09 Dec	Copa
01 Dec - 31 Jan	Avianca
29 Dec - 05 Jan	Copa
25 Dec - 23 Jan	Avianca
29 Dec - 15 Jan	Avianca
06 Dec - 11 Jan	Avianca
31 Dec - 16 Jan	Avianca
30 Dec - 16 Jan	Avianca
30 Dec - 08 Jan	Avianca
31 Dec - 07 Jan	Avianca
18 Dec - 12 Jan	Avianca

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 $371

Return flights