AirHint found the following cheapest return flights from Islip (ISP) to West Palm Beach (PBI) in December 2025 (see full year).
Return flights
| 18 Dec - 20 Dec | Frontier Airlines | direct | |
| 24 Dec - 04 Jan | Southwest Airlines | ||
| 27 Dec - 11 Jan | Southwest Airlines | ||
| 26 Dec - 05 Jan | Southwest Airlines | ||
| 24 Dec - 04 Jan | Frontier Airlines | direct |
Also check the deals for one-way flights from Islip to West Palm Beach in December.
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