Islip to Denver (ISP–DEN) — Airlines, Schedules & Connections
No flights match your filters.
No scheduled airline flights on this route — it's flown by charter / private operators (). No nonstop flights on this route. connecting options below.
Most recently operated nonstop flights — the month shown is when each was last scheduled. Most destinations remain reachable with a connection.
No discontinued nonstop flights on record for this route.
ISP–DEN had nonstop service from Southwest Airlines, last on the schedule in July 2026. There's no nonstop on it right now, so today you'd fly it with one stop. The connecting options below are sorted by layover. Nonstop, it's about 1,655 miles in 4h 4m.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| WN Southwest Airlines | 1 | – | – | – | – |
Connection Landscape
On-Time Performance
Other ways to reach Denver from Islip
| Metric | ISP→DEN | HPN→DEN | JFK→DEN |
|---|---|---|---|
| Distance from ISP | – | 37 mi | 37 mi |
| Nonstop airlines | – | 3 | 13 |
| Weekly flights | – | 1 | 123 |
| Flight time | 4h 4m | 3h 9m | 4h 28m |
| Departure OTP | 0% | – | – |
Travel Essentials
ISP: EDT · DEN: MDT
When it's 6:00 PM in Islip, it's 4:00 PM in Denver.
RTD A Line runs to Denver Union Station (37 min, $10.50) with connections to light rail and bus routes. Taxis have meters; expect $55–65 to downtown.DEN's tent-roof Jeppesen Terminal is a single building; all three concourses connect via the underground automated train. Rental cars are on level 5. For ski resorts, shuttle services depart from Ground Transportation.
Semi-arid with 300+ days of sunshine. Summers are dry and warm (27–34°C) with afternoon thunderstorms that produce dramatic but brief delays. Winters bring cold temperatures (−8 to 5°C) and heavy blizzards that can shut down ground operations.
Spring snowstorms can be heavier than midwinter ones. Altitude (5,430 ft) means low humidity year-round; stay hydrated.
ISP–DEN Quick Facts
Frequently Asked Questions
Flights from ISP to DEN
Long Island MacArthur Airport (ISP) and Denver International Airport (DEN) had nonstop service from Southwest Airlines, last on the schedule in July 2026. The nonstop is dormant right now, so the way to fly it today is one connection, and the options above are sorted by layover.
ISP to DEN Flight Duration and Schedule
Nonstop flight time from ISP to DEN is about 4 hours 4 minutes gate to gate. The route covers a distance of 1,655 miles (2,664 km).
Connecting Options and Alternatives
1-stop connecting options are also available, commonly via Baltimore/Washington International Thurgood Marshall, Raleigh-Durham and Boston Logan. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include White Plains (HPN), New York (JFK) and New York (LGA).