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

Return flights

06 Dec - 11 Dec	LATAM Airlines Group
03 Dec - 10 Dec	Avianca
01 Dec - 12 Dec	Avianca
10 Dec - 16 Dec	Avianca
09 Dec - 16 Dec	Avianca
08 Dec - 14 Dec	Avianca
02 Dec - 14 Dec	Avianca
14 Dec - 31 Dec	Copa
25 Dec - 30 Dec	GOL Linhas Aéreas
14 Dec - 23 Dec	Copa
27 Dec - 01 Jan	LATAM Airlines Group
18 Dec - 06 Jan	GOL Linhas Aéreas
30 Dec - 12 Jan	GOL Linhas Aéreas
30 Dec - 16 Jan	GOL Linhas Aéreas
15 Dec - 03 Jan	LATAM Airlines Group
31 Dec - 07 Jan	Avianca
27 Dec - 02 Jan	LATAM Airlines Group
16 Dec - 01 Jan	GOL Linhas Aéreas
28 Dec - 02 Jan	LATAM Airlines Group
28 Dec - 03 Jan	LATAM Airlines Group

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 395€

Return flights