Cheap flights from Denver to Islip

One-way fares from $275 · DEN → ISP · prices found by travellers in the last 48 hours

Compare all dates Islip → Denver
Cheapest fare
$275

Frontier Airlines · Tue, Dec 22

Cheapest month
December

from $275

Direct flights
Not recently

Usually 1+ stop

Quickest trip
6h 11m

2,690 km

Get a price alert

We'll email you when Denver → Islip drops to your price. It's free, and you can stop any time.

Today's cheapest fare is $275. We'll send one email to confirm. See our privacy policy.

Cheapest month to fly from Denver to Islip

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. December 2026 Cheapest $275

Plan the rest of your trip to Islip

Where to stay, what to do and getting around, from our travel partners.

Where to stay

Hotels in IslipCompare places to stay on Booking.com Find hotels →

Things to do

Things to do in IslipTours, attractions and day trips on Klook Explore →

Getting around

Airport transfer in IslipPre-book a driver to meet you at arrivals, with Kiwitaxi Book a transfer → Car hire in IslipCompare rental cars from major brands on EconomyBookings Compare cars →

About flights from Denver to Islip

Denver (DEN) and Islip (ISP) are about 2,690 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 6h 11m. Over the next few months, one-way fares start from $275, and December 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from Denver to Islip?

The cheapest one-way fare we've seen recently is $275 with Frontier Airlines, departing Tuesday, December 22, 2026.

What is the cheapest month to fly from Denver to Islip?

December 2026 currently has the lowest fares, from $275 one way.

Are there direct flights from Denver to Islip?

We haven't seen direct fares recently, so most journeys include at least one stop.

How long is the flight from Denver to Islip?

The quickest journey we've seen takes about 6h 11m. Denver and Islip are around 2,690 km apart.

Which airlines fly from Denver to Islip?

Recent fares on this route were with Frontier Airlines.

More cheap flights from Denver

Compare flights to Islip from other cities →