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

Return flights

30 Sep - 07 Oct	American Airlines
06 Sep - 13 Sep	Delta
02 Sep - 07 Sep	Spirit Airlines
13 Sep - 20 Sep	United	direct
17 Sep - 24 Sep	Spirit Airlines
20 Sep - 24 Sep	Spirit Airlines
12 Sep - 15 Sep	Spirit Airlines
27 Sep - 02 Oct	Spirit Airlines
13 Sep - 18 Sep	Spirit Airlines
03 Sep - 10 Sep	Arajet
10 Sep - 17 Sep	Spirit Airlines
05 Sep - 10 Sep	Frontier Airlines
26 Sep - 03 Oct	jetBlue

Also check the deals for one-way flights from Newark to Willemstad 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 Willemstad in September from 344€

Return flights