$75 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 2/25. 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

Thu, Jan 8 - Tue, Jan 13
Frontier Logo
8:40 pm - 8:24 am
ISP
-
DEN
13h 44m1 stop
Frontier Logo
11:30 am - 10:46 pm
DEN
-
ISP
9h 16m1 stop
$183Frontier
Sat, Jan 10 - Thu, Jan 15
Frontier Logo
7:56 pm - 10:59 pm
ISP
-
DEN
29h 03m1 stop
Frontier Logo
4:15 pm - 7:50 pm
DEN
-
ISP
25h 35m1 stop
$204Frontier
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
8:40 pm - 10:59 pm
ISP
-
DEN
28h 19m1 stop
Frontier Logo
6:31 pm - 7:51 pm
DEN
-
ISP
23h 20m1 stop
$218Frontier
Thu, Jan 8 - Thu, Jan 15
Frontier Logo
8:40 pm - 10:59 pm
ISP
-
DEN
28h 19m1 stop
Frontier Logo
4:15 pm - 7:50 pm
DEN
-
ISP
25h 35m1 stop
$221Frontier
Thu, Jan 22 - Sun, Jan 25
Multiple Airlines Logo
7:43 pm - 12:28 pm
ISP
-
DEN
18h 45m1 stop
Multiple Airlines Logo
1:21 pm - 1:21 pm
DEN
-
ISP
22h 00m1 stop
$231Multiple Airlines
Mon, Jan 26 - Wed, Jan 28
Frontier Logo
7:43 pm - 5:36 pm
ISP
-
DEN
23h 53m1 stop
Frontier Logo
6:32 pm - 6:48 pm
DEN
-
ISP
22h 16m1 stop
$234Frontier
Tue, Jan 20 - Fri, Jan 23
Frontier Logo
12:00 pm - 10:00 am
ISP
-
DEN
24h 00m1 stop
Frontier Logo
9:41 am - 8:47 pm
DEN
-
ISP
9h 06m1 stop
$239Frontier
Thu, Jan 22 - Sun, Jan 25
Multiple Airlines Logo
7:43 pm - 12:19 pm
ISP
-
DEN
18h 36m2 stops
Multiple Airlines Logo
1:21 pm - 1:21 pm
DEN
-
ISP
22h 00m1 stop
$244Multiple Airlines
Tue, Jan 6 - Tue, Jan 13
Frontier Logo
12:00 pm - 7:59 pm
ISP
-
DEN
9h 59m1 stop
Frontier Logo
11:30 am - 10:46 pm
DEN
-
ISP
9h 16m1 stop
$247Frontier
Thu, Feb 19 - Mon, Feb 23
Frontier Logo
5:07 pm - 7:59 pm
ISP
-
DEN
28h 52m1 stop
Frontier Logo
5:01 am - 2:39 pm
DEN
-
ISP
7h 38m1 stop
$254Frontier
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 January.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Islip to Colorado, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Islip to Colorado is September, when tickets cost $336 (return) on average. On the other hand, the most expensive months are December and April, when the average cost of round-trip tickets is $653 and $631 respectively.

What’s the cheapest day of the week to fly from Islip to Colorado?

The average price of all round-trip flights from Islip to Colorado clicked on KAYAK for each day over the last 12 months.

For Islip to Colorado, Wednesday is the cheapest day to fly on average and Friday is the most expensive. Flying from Colorado back to Islip, the best deals are generally found on Thursday, with Wednesday being the most expensive.

Good to know

Low seasonJanuary
Cheapest flight$75
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly with an average 6% increase in price.
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.

  • What is the cheapest time of day to fly to Colorado?

    The cheapest time of day to fly to Colorado is generally at night, when round-trip flights cost $148 on average. Morning departures are around 12% cheaper than evening flights, on average. The most expensive time of day to fly to Colorado is generally in the evening, which is peak travel time and where the average cost of a ticket is $268.

Reviews of the top airlines 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.
7.9
SouthwestOverall score based on 4249 reviews
8.1Boarding
8.0Comfort
7.0Food
8.6Crew
7.5Entertainment
Airline reviews

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

2.0 MediocreRobert, Dec 2025
LAS - TPA
Read more Southwest reviews

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

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!

No delays and arrived to destination 30 min early. Staff was super friendly.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

Near 4 hour flight with only 1 service. Had to use call button to request water. Internet and power not working until into flight. Internet would stop working during flight.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

Seats were new and comfortable. Staff was fine. Missed my connection due to weather -which wasn’t their fault- but got no help at all. Gate staff sent me to customer service, which was and stayed unstaffed. Sign with QR code directed me to call or chat. Chat was useless. Call was returned after an hour. No itinerary offered by Frontier could get me home in less than 30 hours. Rebooked with another airline and got a partial refund that came to about 10 percent of what I paid to get home.

The experience was good. No frills but I got there safe and sound and on time.

As every law enforcement agency I could imagine surrounded the plane and we didn’t disembark for 2 hours and then had to stick around for another hour to go get our personal belongings after leaving them behind and being bused away from the plane, it was scary and inconvenient. We were given no information as to why this was happening. Lack of communication with passengers was disappointing.

Frontier Airlines was AWFUL. I was an hour early for my flight and the lady refused to check me in. I had to purchase a whole new ticket with a different airline.

Late, terrible communication, horrible planning of passenger seating until the literal last minute. One of the worst flying experiences of my life. Y'all suck

First of all, we never got on the connecting flight to Denver. They delayed our flight for two hours. If we would have gotten on that flight, we would have been stuck in Denver for 13 hours. So we re- routed our flight for a straight through flight to Oklahoma two days later. THEN, they delayed that flight for two hours. After that we were able to finally get on our flight and come home. Frontier Airlines - one of the worst airlines I have ever been on.

Terrible communication with weather delay, lost baggage, near impossible to reach customer service

My tickets got canceled on me by your site and I didn't have a flight. Then you kept sending me emails on the status of q flight I didn't have tickets for.

Flight was late. Missed connecting in Denver. My new flight is more than 24 hours later and I have no room, vouchers, or compensation, and might also be bumped from the one tomorrow.

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

Information on your arrival and departure airports