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

Return flights

01 Dec - 14 Dec	LATAM Airlines Group
01 Dec - 09 Dec	Avianca
04 Dec - 12 Dec	Avianca
09 Dec - 16 Dec	Avianca
03 Dec - 07 Dec	Avianca
16 Dec - 29 Dec	Avianca
21 Dec - 08 Jan	Avianca
22 Dec - 08 Jan	Avianca
15 Dec - 21 Dec	Avianca
12 Dec - 21 Dec	Avianca
01 Dec - 21 Dec	Avianca
16 Dec - 01 Jan	Avianca
23 Dec - 31 Dec	Avianca
24 Dec - 02 Jan	Avianca
26 Dec - 09 Jan	Avianca
19 Dec - 02 Jan	Avianca
20 Dec - 07 Jan	Avianca
27 Dec - 08 Jan	Avianca
16 Dec - 08 Jan	Avianca
06 Dec - 13 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.

Book a cheap hotel in Buenos Aires

Cheap car rent in Buenos Aires

Cheapest return flights from San Jose to Buenos Aires in December from 434€

Return flights