$90 Find Cheap Flights from Islip to Colorado

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Islip to Colorado departing on 2/23. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Colorado

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Colorado, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Colorado, as well as popular online travel agencies
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Flight Deals

Book Cheap Islip to Colorado Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Islip to Colorado that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Islip to Colorado

Mon, Feb 23 - Thu, Feb 26
Frontier Logo
3:59 pm - 10:59 pm
ISP
-
DEN
9h 00m
1 stop
Frontier Logo
11:59 pm - 2:39 pm
DEN
-
ISP
12h 40m
1 stop
$235Frontier
Mon, Feb 23 - Thu, Feb 26
Frontier Logo
3:59 pm - 10:59 pm
ISP
-
DEN
9h 00m
1 stop
Frontier Logo
6:00 am - 4:22 pm
DEN
-
ISP
8h 22m
1 stop
$304Frontier
Sun, Apr 12 - Wed, Apr 15
Frontier Logo
8:36 pm - 12:09 pm
ISP
-
DEN
17h 33m
2 stops
Frontier Logo
3:41 pm - 9:13 am
DEN
-
ISP
15h 32m
1 stop
$310Frontier
Mon, Feb 23 - Thu, Feb 26
Frontier Logo
3:59 pm - 10:59 pm
ISP
-
DEN
9h 00m
1 stop
Frontier Logo
6:00 am - 4:22 pm
DEN
-
ISP
8h 22m
1 stop
$336Frontier
Sun, Apr 12 - Wed, Apr 15
Frontier Logo
8:36 pm - 8:21 am
ISP
-
DEN
13h 45m
1 stop
Frontier Logo
11:59 pm - 2:55 pm
DEN
-
ISP
12h 56m
1 stop
$366Frontier
Wed, Feb 18 - Sat, Feb 21
Frontier Logo
2:03 pm - 10:59 pm
ISP
-
DEN
10h 56m
1 stop
Frontier Logo
11:59 pm - 7:38 am
DEN
-
ISP
29h 39m
1 stop
$375Frontier
Fri, Mar 13 - Sun, Mar 15
Multiple Airlines Logo
2:31 pm - 8:55 pm
ISP
-
DEN
8h 24m
1 stop
Multiple Airlines Logo
11:59 pm - 1:31 pm
DEN
-
ISP
11h 32m
2 stops
$386Multiple Airlines
Sat, Mar 7 - Thu, Mar 12
Frontier Logo
10:43 am - 11:08 pm
ISP
-
DEN
14h 25m
1 stop
Frontier Logo
12:18 am - 9:48 am
DEN
-
ISP
7h 30m
1 stop
$399Frontier
Sun, Apr 12 - Wed, Apr 15
Southwest Logo
11:50 am - 8:10 pm
ISP
-
DEN
10h 20m
2 stops
Southwest Logo
8:35 am - 6:30 pm
DEN
-
ISP
7h 55m
2 stops
$402Southwest
Tue, Mar 3 - Tue, Mar 10
Southwest Logo
12:40 pm - 10:35 pm
ISP
-
COS
11h 55m
2 stops
Southwest Logo
6:00 am - 4:05 pm
COS
-
ISP
8h 05m
2 stops
$412Southwest
Booking Insights

KAYAK's insights & trends for Islip to Colorado flights

Get data-powered insights and trends into flights from Islip to Colorado to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Islip, New York to Colorado?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Islip, New York to Colorado departing in February.
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Good to know

Low seasonSeptember
Cheapest flight$90
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Islip to Denver

FAQs - booking Colorado flights

  • How does KAYAK find such low prices on flights from Islip to Colorado?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Islip to Colorado.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Islip to Colorado?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Islip to Colorado is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Islip to Colorado?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Islip to Colorado with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Islip to Colorado?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Islip to Colorado up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Islip to Colorado

 
See real verified KAYAK customer reviews for airlines flying from Islip to Colorado. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Islip to Colorado? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4273 reviews
8.6Crew
7.5Entertainment
7.0Food
8.1Boarding
8.0Comfort
Airline reviews

Flight attendants very hospitable and friendly. Pilot flew a smooth take off and landing.

10.0 ExcellentAnonymous, Feb 2026
MSY - PHX
Read more Southwest reviews

Flight attendants very hospitable and friendly. Pilot flew a smooth take off and landing.

Paid for premium extra leg room but the bin space for rows 1-3 had to go in rows 4-6 and 4-6 had to go to 7-9 because flight attendants have snacks and their luggage upfront. So we pay extra to have to fight thru traffic to get our bags. Only 2nd day of new seating so hope they fix this.

WIFI was great. My selection for seating is an aisle, but during my trip, I never had an aisle seat. If we can get that corrected, I will be thrilled. No snack or drink on this flight.

WIFI was great. My selection for seating is an aisle, but during my trip, I never had an aisle seat. If we can get that corrected, I will be thrilled.

The wifi on the plane is great. The only issue that I have is that I prefer an aisle seat and on my trips this week, I was either in the middle or window. If we can work to secure aisle seating, I will be thrilled. Nice trip.

All good except once again bags took an hour at Midway Airport Happens all the time. Ridiculous

Everything went smoothly and we even arrived a little bit early.

Great vacation. Can't wait till next year for another one.

Great flight but super high price. Glad it was a business trip and not personal

Airline travel is always too cramped to really be pleasant, but the cabin crew on this flight did a pretty good job of making up for it by putting on some music during boarding and sprinkling a few funny remarks into the safety briefing and announcements, and just generally being friendly and helpful. It definitely reminded me of why I prefer the in-flight experience on Southwest!

Everything you need to know for your flight from Islip to Colorado

Information on your arrival and departure airports

Islip (ISP)