AirHint found the following cheapest return flights from Miami (MIA) to Buenos Aires (AEP) in September 2025 (see full year).

Return flights

26 Sep - 29 Sep	Sky Airline
22 Sep - 24 Sep	LATAM Airlines Group
17 Sep - 24 Sep	Sky Airline
17 Sep - 24 Oct	Sky Airline
20 Sep - 22 Sep	Sky Airline
18 Sep - 28 Sep	Sky Airline
13 Sep - 19 Sep	Sky Airline
14 Sep - 19 Sep	Sky Airline
15 Sep - 19 Sep	Sky Airline
06 Sep - 15 Sep	Volaris Costa Rica
29 Sep - 19 Oct	Spirit Airlines
18 Sep - 24 Sep	Sky Airline
27 Sep - 15 Oct	Sky Airline
27 Sep - 18 Oct	Sky Airline
29 Sep - 31 Oct	Sky Airline
08 Sep - 06 Oct	Avianca
08 Sep - 03 Oct	Avianca
13 Sep - 03 Oct	Arajet
29 Sep - 08 Oct	Avianca
29 Sep - 12 Oct	Avianca

Also check the deals for one-way flights from Miami to Buenos Aires 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 Miami to Buenos Aires in September from $618

Return flights