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

Return flights

01 Sep - 11 Sep	Frontier Airlines
15 Sep - 29 Sep	Frontier Airlines
08 Sep - 15 Sep	Frontier Airlines
26 Sep - 05 Oct	Spirit Airlines
01 Sep - 07 Sep	Frontier Airlines
09 Sep - 22 Sep	Spirit Airlines
16 Sep - 24 Sep	Frontier Airlines
16 Sep - 23 Sep	Spirit Airlines
01 Sep - 29 Sep	Air Canada
24 Sep - 01 Oct	Air Canada
08 Sep - 16 Sep	Frontier Airlines
09 Sep - 19 Oct	Spirit Airlines
05 Sep - 13 Sep	Frontier Airlines
24 Sep - 25 Oct	Air Canada
24 Sep - 02 Oct	Air Canada
27 Sep - 02 Oct	Air Canada
29 Sep - 08 Oct	Air Canada
29 Sep - 12 Oct	Delta

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.

Book a cheap hotel in Buenos Aires

Cheap car rent in Buenos Aires

Cheapest return flights from Newark to Buenos Aires in September from 706€

Return flights