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

Return flights

27 Sep - 01 Oct	American Airlines
17 Sep - 24 Sep	Spirit Airlines
18 Sep - 24 Sep	Spirit Airlines
21 Sep - 28 Sep	Spirit Airlines
24 Sep - 28 Sep	Arajet
15 Sep - 20 Sep	American Airlines
25 Sep - 28 Sep	Spirit Airlines
27 Sep - 30 Sep	Spirit Airlines
09 Sep - 15 Sep	Spirit Airlines
26 Sep - 28 Sep	Spirit Airlines
13 Sep - 20 Sep	United	direct
27 Sep - 02 Oct	Spirit Airlines

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 $516

Return flights