12 destinations have scheduled flights from ISP, about 116 departures a week. Weekly frequencies come from airline schedules and observed departures, not live status.
| Destination | Flights per week | Airlines | Typical duration |
|---|---|---|---|
| Baltimore/Washington International Thurgood Marshall Airport (BWI) | 23 | Southwest Airlines Co. | — |
| Palm Beach International Airport (PBI) | 21 | Top Air (Turkey), Southwest Airlines Co. | — |
| Orlando International Airport (MCO) | 20 | Southwest Airlines Co., Frontier Airlines, Inc. | — |
| Fort Lauderdale Hollywood International Airport (FLL) | 12 | Top Air (Turkey) | — |
| Tampa International Airport (TPA) | 12 | Frontier Airlines, Inc., Top Air (Turkey) | — |
| Southwest Florida International Airport (RSW) | 9 | Mexicana, Top Air (Turkey) | — |
| Boston Logan International Airport (BOS) | 7 | Hyannis Air Service, Inc. d/b/a Cap | — |
| Vero Beach Regional Airport (VRB) | 4 | Mexicana | — |
| Charleston International Airport (CHS) | 2 | Mexicana | — |
| Wilmington International Airport (ILM) | 2 | Mexicana | — |
| Norfolk International Airport (ORF) | 2 | Mexicana | — |
| Raleigh-Durham International Airport (RDU) | 2 | Mexicana | — |
GET /routes returns each scheduled flight from ISP: airline, flight number, departure and arrival time, duration, days of operation and aircraft type.
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