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

Return flights

03 Dec - 08 Dec	Avianca
05 Dec - 12 Dec	LATAM Airlines Group
05 Dec - 08 Dec	Avianca
03 Dec - 10 Dec	Avianca
04 Dec - 11 Dec	LATAM Airlines Group
08 Dec - 20 Dec	LATAM Airlines Group
10 Dec - 16 Dec	Avianca
09 Dec - 16 Dec	Avianca
04 Dec - 10 Dec	Avianca
29 Dec - 15 Jan	LATAM Airlines Group
30 Dec - 27 Jan	LATAM Airlines Group
23 Dec - 06 Jan	LATAM Airlines Group
20 Dec - 30 Dec	Copa
15 Dec - 05 Jan	LATAM Airlines Group
20 Dec - 08 Jan	Avianca
25 Dec - 10 Jan	Avianca
30 Dec - 16 Jan	Avianca
31 Dec - 16 Jan	LATAM Airlines Group
20 Dec - 01 Jan	Copa
18 Dec - 05 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 447€

Return flights