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

Return flights

06 Sep - 14 Sep	Avianca
11 Sep - 21 Sep	Avianca
23 Sep - 30 Sep	Avianca
04 Sep - 09 Sep	Avianca
01 Sep - 07 Sep	Avianca
02 Sep - 14 Sep	Avianca
01 Sep - 10 Sep	LATAM Airlines Group
04 Sep - 09 Oct	LATAM Airlines Group
04 Sep - 08 Sep	LATAM Airlines Group
02 Sep - 10 Sep	LATAM Airlines Group
25 Sep - 28 Sep	LATAM Airlines Group
22 Sep - 03 Oct	Avianca
22 Sep - 02 Oct	Copa
22 Sep - 01 Oct	Avianca
18 Sep - 09 Oct	Avianca

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

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 September from 450€

Return flights