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

Return flights

02 Dec - 08 Dec	GOL Linhas Aéreas
25 Dec - 07 Jan	GOL Linhas Aéreas
10 Dec - 16 Dec	Avianca
23 Dec - 13 Jan	GOL Linhas Aéreas
19 Dec - 15 Jan	LATAM Airlines Group
08 Dec - 14 Dec	Avianca
19 Dec - 30 Dec	Avianca
15 Dec - 22 Dec	Avianca
01 Dec - 07 Dec	Avianca
01 Dec - 19 Dec	Avianca
24 Dec - 29 Dec	Avianca
26 Dec - 02 Jan	Avianca
19 Dec - 31 Dec	Avianca
26 Dec - 30 Dec	Avianca
07 Dec - 12 Jan	Avianca
30 Dec - 12 Jan	Avianca
20 Dec - 01 Jan	Avianca
29 Dec - 05 Jan	Avianca
19 Dec - 07 Jan	Avianca
16 Dec - 03 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 438€

Return flights