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

Return flights

01 Sep - 07 Sep	Frontier Airlines
17 Sep - 29 Sep	Air Canada
16 Sep - 24 Sep	Air Canada
19 Sep - 29 Sep	Air Canada
01 Sep - 15 Sep	jetBlue
09 Sep - 19 Oct	Aeromexico
25 Sep - 07 Oct	United
08 Sep - 16 Sep	Delta
16 Sep - 26 Sep	United
17 Sep - 28 Sep	Delta
25 Sep - 05 Oct	Delta
28 Sep - 05 Oct	United
19 Sep - 05 Oct	Delta
19 Sep - 26 Sep	Delta
20 Sep - 26 Sep	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.

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Cheapest return flights from Newark to Buenos Aires in September from 754€

Return flights