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

Return flights

29 Sep - 07 Oct	LATAM Airlines Group
28 Sep - 06 Oct	LATAM Airlines Group
28 Sep - 08 Oct	LATAM Airlines Group
24 Sep - 04 Oct	LATAM Airlines Group
29 Sep - 05 Oct	LATAM Airlines Group
25 Sep - 02 Oct	LATAM Airlines Group
23 Sep - 02 Oct	Avianca
22 Sep - 30 Sep	Avianca
30 Sep - 14 Oct	Avianca
18 Sep - 09 Oct	Avianca
29 Sep - 03 Oct	Avianca
18 Sep - 25 Sep	Avianca
20 Sep - 27 Sep	Avianca
24 Sep - 29 Sep	Avianca
25 Sep - 29 Sep	Avianca
23 Sep - 27 Sep	Avianca
19 Sep - 28 Sep	LATAM Airlines Group
25 Sep - 28 Sep	Avianca
15 Sep - 26 Sep	Avianca
16 Sep - 26 Sep	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 415€

Return flights