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

Return flights

03 Sep - 17 Sep	Spirit Airlines
08 Sep - 16 Sep	Spirit Airlines
20 Sep - 25 Sep	Spirit Airlines
10 Sep - 18 Sep	Frontier Airlines
06 Sep - 13 Sep	Spirit Airlines
01 Sep - 10 Sep	Spirit Airlines
12 Sep - 27 Sep	Spirit Airlines
09 Sep - 18 Sep	Spirit Airlines
13 Sep - 20 Sep	Spirit Airlines
26 Sep - 28 Sep	Frontier Airlines
18 Sep - 11 Oct	Avianca
20 Sep - 04 Oct	Spirit Airlines
15 Sep - 07 Oct	LATAM Airlines Group
24 Sep - 19 Oct	Frontier Airlines

Also check the deals for one-way flights from New York 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 New York to Buenos Aires in September from 635€

Return flights