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

Return flights

09 Sep - 19 Oct	Avianca
10 Sep - 17 Sep	Avianca
29 Sep - 06 Oct	Avianca
02 Sep - 08 Sep	Avianca
09 Sep - 16 Sep	Avianca
15 Sep - 29 Sep	Avianca
16 Sep - 24 Sep	Avianca
16 Sep - 23 Sep	Avianca
12 Sep - 03 Oct	Avianca
05 Sep - 13 Sep	Avianca
12 Sep - 16 Sep	Avianca
18 Sep - 11 Oct	Avianca
17 Sep - 24 Sep	Avianca
01 Sep - 29 Sep	Frontier Airlines
29 Sep - 12 Oct	Avianca
26 Sep - 05 Oct	Avianca
24 Sep - 25 Oct	Avianca
27 Sep - 06 Oct	Avianca
29 Sep - 08 Oct	LATAM Airlines Group

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 690€

Return flights