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

Return flights

20 Sep - 25 Sep	Copa
09 Sep - 19 Oct	Copa
03 Sep - 17 Sep	Spirit Airlines
15 Sep - 07 Oct	Spirit Airlines
07 Sep - 08 Sep	Spirit Airlines
10 Sep - 19 Sep	Spirit Airlines
25 Sep - 29 Sep	Frontier Airlines
09 Sep - 18 Sep	Copa
19 Sep - 24 Sep	Copa
06 Sep - 18 Sep	Copa
20 Sep - 04 Oct	Copa
18 Sep - 11 Oct	Copa
01 Sep - 10 Sep	Avianca
08 Sep - 16 Sep	Avianca
24 Sep - 19 Oct	Avianca
20 Sep - 03 Oct	Frontier Airlines
30 Sep - 22 Oct	Copa

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 561€

Return flights