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

Return flights

27 Sep - 11 Oct	Spirit Airlines
27 Sep - 04 Oct	Spirit Airlines
13 Sep - 20 Sep	Spirit Airlines
06 Sep - 20 Sep	Spirit Airlines
06 Sep - 13 Sep	Spirit Airlines
19 Sep - 22 Sep	Spirit Airlines
02 Sep - 06 Sep	Spirit Airlines
05 Sep - 07 Sep	Frontier Airlines
03 Sep - 06 Sep	Spirit Airlines
06 Sep - 19 Sep	Spirit Airlines
13 Sep - 23 Sep	Spirit Airlines
26 Sep - 29 Sep	Spirit Airlines

Also check the deals for one-way flights from Philadelphia 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 Philadelphia to Oranjestad in September from 333€

Return flights