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

Return flights

04 Dec - 08 Dec	Avianca
04 Dec - 09 Dec	Avianca
07 Dec - 13 Dec	Flybondi
15 Dec - 15 Jan	LATAM Airlines Group
08 Dec - 14 Dec	JetSmart
03 Dec - 10 Dec	Flybondi
14 Dec - 20 Dec	JetSmart
01 Dec - 15 Dec	JetSmart
02 Dec - 01 Jan	LATAM Airlines Group
09 Dec - 15 Dec	Sky Airline
23 Dec - 02 Jan	Sky Airline
30 Dec - 16 Jan	Sky Airline
02 Dec - 13 Dec	LATAM Airlines Group
08 Dec - 11 Dec	Flybondi
18 Dec - 04 Jan	Aerolíneas Argentinas
29 Dec - 13 Jan	Sky Airline
01 Dec - 15 Jan	Sky Airline
27 Dec - 09 Jan	Flybondi
25 Dec - 11 Jan	LATAM Airlines Group
28 Dec - 11 Jan	JetSmart

Also check the deals for one-way flights from Buenos Aires to San Jose 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 Buenos Aires to San Jose in December from 515€

Return flights