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

Return flights

16 Sep - 07 Oct	Spirit Airlines
22 Sep - 30 Sep	Frontier Airlines
22 Sep - 25 Sep	Frontier Airlines
24 Sep - 01 Oct	Spirit Airlines
17 Sep - 01 Oct	Spirit Airlines
17 Sep - 20 Sep	Spirit Airlines
15 Sep - 22 Sep	Spirit Airlines
27 Sep - 06 Oct	Spirit Airlines
14 Sep - 22 Sep	Air Canada
12 Sep - 17 Sep	Air Canada
13 Sep - 18 Sep	Frontier Airlines
13 Sep - 20 Sep	Frontier Airlines
15 Sep - 28 Sep	Spirit Airlines
12 Sep - 21 Sep	Spirit Airlines
24 Sep - 08 Oct	Spirit Airlines
24 Sep - 02 Oct	Spirit Airlines
21 Sep - 05 Oct	Frontier Airlines
30 Sep - 09 Oct	Aeromexico

Also check the deals for one-way flights from Newark 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 Newark to Buenos Aires in September from $790

Return flights