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

Return flights

01 Sep - 14 Sep	Spirit Airlines
12 Sep - 14 Sep	Spirit Airlines
27 Sep - 10 Oct	Spirit Airlines
06 Sep - 13 Sep	Spirit Airlines
08 Sep - 16 Sep	Spirit Airlines
05 Sep - 19 Sep	Spirit Airlines
03 Sep - 16 Sep	Spirit Airlines
08 Sep - 13 Sep	LATAM Airlines Group
12 Sep - 21 Sep	Spirit Airlines
08 Sep - 21 Sep	Spirit Airlines
12 Sep - 20 Sep	Spirit Airlines
25 Sep - 02 Oct	Spirit Airlines
26 Sep - 03 Oct	LATAM Airlines Group

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 710€

Return flights