AirHint found the following cheapest return flights from San Jose (SJO) to Buenos Aires (AEP) in January 2026 (see full year).

Return flights

23 Jan - 01 Feb	LATAM Airlines Group
04 Jan - 11 Jan	Copa
02 Jan - 09 Jan	Avianca
19 Jan - 25 Jan	Avianca
12 Jan - 19 Jan	Avianca
22 Jan - 02 Feb	Avianca
21 Jan - 28 Jan	Avianca
28 Jan - 04 Feb	Avianca
06 Jan - 19 Jan	Avianca
19 Jan - 26 Jan	Avianca
04 Jan - 16 Jan	Avianca
14 Jan - 27 Jan	Avianca
01 Jan - 14 Jan	Avianca

Also check the deals for one-way flights from San Jose to Buenos Aires in January.

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 January from 536€

Return flights