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

Return flights

17 Sep - 22 Sep	Spirit Airlines
03 Sep - 10 Sep	Spirit Airlines
01 Sep - 07 Sep	Frontier Airlines
02 Sep - 10 Sep	Spirit Airlines
10 Sep - 18 Sep	Air Canada
09 Sep - 17 Sep	Air Canada
07 Sep - 13 Sep	Spirit Airlines
09 Sep - 30 Sep	Aeromexico
30 Sep - 14 Oct	Aeromexico
01 Sep - 03 Sep	Frontier Airlines
06 Sep - 19 Sep	Aeromexico
30 Sep - 08 Oct	Air Canada
26 Sep - 05 Oct	Aeromexico
28 Sep - 25 Oct	Air Canada
09 Sep - 19 Oct	United

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 $843

Return flights