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

Return flights

23 Aug - 01 Sep	GOL Linhas Aéreas
26 Aug - 02 Sep	GOL Linhas Aéreas
22 Aug - 29 Aug	LATAM Airlines Group
28 Aug - 04 Sep	Avianca
26 Aug - 04 Sep	Avianca
19 Aug - 29 Aug	Avianca
19 Aug - 25 Aug	Avianca
21 Aug - 30 Aug	Avianca
21 Aug - 31 Aug	Avianca
19 Aug - 30 Aug	Avianca
28 Aug - 03 Sep	Avianca
11 Aug - 20 Aug	Avianca
24 Aug - 29 Aug	Avianca
22 Aug - 12 Sep	Avianca
06 Aug - 13 Aug	Copa
14 Aug - 18 Aug	GOL Linhas Aéreas
23 Aug - 13 Sep	Avianca
09 Aug - 21 Sep	Avianca

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

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 August from 420€

Return flights