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

Return flights

09 Oct - 10 Oct	LATAM Airlines Group
30 Oct - 04 Nov	Avianca
13 Oct - 24 Oct	Avianca
13 Oct - 20 Oct	Avianca
13 Oct - 25 Oct	Avianca
28 Oct - 04 Nov	Avianca
17 Oct - 26 Oct	LATAM Airlines Group
07 Oct - 10 Oct	LATAM Airlines Group
19 Oct - 08 Nov	LATAM Airlines Group
02 Oct - 12 Oct	LATAM Airlines Group
09 Oct - 15 Oct	GOL Linhas Aéreas
14 Oct - 25 Oct	GOL Linhas Aéreas
14 Oct - 21 Oct	GOL Linhas Aéreas
18 Oct - 02 Nov	GOL Linhas Aéreas
23 Oct - 10 Nov	Avianca
31 Oct - 07 Nov	Avianca
25 Oct - 22 Nov	Avianca
09 Oct - 02 Nov	Avianca
01 Oct - 05 Nov	Avianca

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

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 October from 401€

Return flights