AirHint found the following cheapest return flights from Chicago (ORD) to Oranjestad (AUA) in September 2025 (see full year).

Return flights

13 Sep - 20 Sep	Spirit Airlines
18 Sep - 22 Sep	Spirit Airlines
26 Sep - 29 Sep	Frontier Airlines
19 Sep - 23 Sep	Frontier Airlines
08 Sep - 15 Sep	Copa
12 Sep - 14 Sep	Frontier Airlines
03 Sep - 08 Sep	Spirit Airlines
25 Sep - 28 Sep	Spirit Airlines
09 Sep - 16 Sep	Avianca
28 Sep - 03 Oct	United

Also check the deals for one-way flights from Chicago to Oranjestad 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 Chicago to Oranjestad in September from 332€

Return flights