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$146+ Cheap flights from Islip, NY (ISP) to Colorado

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — DEN
Jul 21 — Jul 281
Mon 7/21
Mon 7/28
1 adult, Economy
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Cheap flight deals from Islip to Colorado

Keep the following information in mind while searching for Islip to Colorado flight deals. Data was last updated July 16, 2025.

Round-trip from

$266
(Priceline)

One-way from

$146
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$312
From Islip Long Island to Colorado
Search Deals
One-way flight from Islip Long Island to Colorado
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High demand for flights, 1% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Islip to Colorado

Cheapest flights from Islip to Colorado
Explore the most affordable flight options available from Islip to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 16, 2025.

This Priceline deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/82:05 pmISP - DEN
1 stop11h 51mFrontier
Mon 8/118:44 amDEN - ISP
1 stop9h 08mFrontier
Deal found 7/13$266
This Southwest deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/113:05 pmISP - DEN
2 stops7h 00mSouthwest
Mon 9/155:20 amDEN - ISP
2 stops9h 10mSouthwest
Deal found 7/15$343
This Southwest deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/116:00 amISP - COS
1 stop10h 15mSouthwest
Mon 9/153:00 pmCOS - ISP
1 stop5h 55mSouthwest
Deal found 7/15$385
This United deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/57:30 amISP - COS
2 stops16h 14mMultiple Airlines
Mon 8/115:20 pmCOS - ISP
2 stops18h 04mMultiple Airlines
Deal found 7/16$1,103

Cheapflights Fare Finder

Customize your flight search to find flights from Islip to Colorado that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 16, 2025.
Use the filters below to find and compare flights from Islip to Colorado that are best for you.

Fly from

Islip

Fly to

Colorado

Route

Depart

Return

Price

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 8/8

2:05 pm-11:56 pm

1 stop11h 51m

Denver Intl

Mon 8/11

8:44 am-7:52 pm

1 stop9h 08m

$266

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 9/11

3:05 pm-8:05 pm

2 stops7h 00m

Denver Intl

Mon 9/15

5:20 am-4:30 pm

2 stops9h 10m

$343

IslipColorado Springs

ISP - COS

ISPCOS

Islip Long Island

Thu 9/11

6:25 am-3:45 pm

2 stops11h 20m

Colorado Springs

Mon 9/15

3:00 pm-10:55 pm

1 stop5h 55m

$385

IslipColorado Springs

ISP - COS

ISPCOS

Islip Long Island

Tue 8/5

7:30 am-9:44 pm

2 stops16h 14m

Colorado Springs

Mon 8/11

5:20 pm-1:24 pm

2 stops18h 04m

$1,103

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Wed 10/15

5:05 pm-11:16 pm

1 stop8h 11m

$146

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Tue 8/26

6:05 am-1:25 pm

2 stops9h 20m

$172

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 8/1

10:36 am-7:16 am

3 stops22h 40m

$438

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 7/31

7:39 pm-10:59 pm

3 stops53h 20m

$499

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/14

Best time to book a flight from Islip to Colorado

Have a flexible travel schedule? Discover the best time to fly to Colorado from Islip with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from Islip, New York to Colorado?

Currently, October is the cheapest month in which you can book a flight from Islip, New York to Colorado (average of $197). Flying from Islip, New York to Colorado in March is currently the most expensive (average of $278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ISP to CO?

Find hourly flight availability from Islip to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Islip, New York to Colorado as you normally would.

Reviews of airlines servicing Colorado

Get insights into the airlines that provide service to Colorado. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Colorado. Reviews last updated July 16, 2025.
Peruse reviews from past customers who have flown with Southwest, Breeze Airways, and Frontier from Islip to Colorado to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,241 reviews

Entertainment

7.6

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Entertainment

7.6

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Breeze Airways
8.0
Very good
187 reviews
Southwest
8.0
Very good
4,241 reviews

Entertainment

7.6

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Frontier
5.9
Fair
3,256 reviews
Southwest
8.0
Very good
4,241 reviews

Entertainment

7.6

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Related info for your journey

Find useful and relevant information for your journey from Islip to Colorado. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to Colorado?

    If you book a flight to Colorado from Islip, you will be flying from Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip.

  • What are the cheapest airlines to fly from Islip, New York to Colorado one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $146. Southwest flights start at $172 while deals on Breeze Airways start at $499 one-way.

  • What are the most popular routes from Islip, New York to Colorado?

    Most travelers choose Islip Long Island - Denver Intl, Islip Long Island - Colorado Springs or Islip Long Island - Montrose County when deciding on the best route from Islip, New York to Colorado.

  • Can I find deals for flights from Islip to Colorado that include hotel bookings?

    Yes. In addition to deals on Islip to Colorado flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Colorado?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Colorado.

  • Can I find deals for business class flights from Islip to Colorado?

    Yes. Cheapflights offers flight deals from Islip to Colorado by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Islip, New York to Colorado?

    Currently, October is the cheapest month in which you can book a flight from Islip, New York to Colorado (average of $197). Flying from Islip, New York to Colorado in March is currently the most expensive (average of $278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 2 airlines flying from Islip to Colorado

Discover the top 2 airlines that operate flights from Islip to Colorado. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$148Average$260FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$377Average$521FlexibilityNo cancel feeOn-time63%

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