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$81+ 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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — DEN
Jan 21 — Jan 281
Wed 1/21
Wed 1/28
1 adult, Economy
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Cheap 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 December 22, 2025.

This CheapOair deal was found by Cheapflights users on 12/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:25 amISP - DEN
1 stop10h 29mFrontier
Sun 12/2811:59 pmDEN - ISP
1 stop17h 41mFrontier
Deal found 12/19$413
This CheapOair deal was found by Cheapflights users on 12/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:15 amISP - DEN
1 stop28h 41mFrontier
Sun 12/2811:59 pmDEN - ISP
1 stop17h 41mFrontier
Deal found 12/20$433
This CheapOair deal was found by Cheapflights users on 12/22. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:00 amISP - DEN
1 stop10h 54mFrontier
Thu 1/89:44 amDEN - ISP
1 stop8h 01mFrontier
Deal found 12/22$434
This CheapOair deal was found by Cheapflights users on 12/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:25 amISP - DEN
1 stop10h 29mFrontier
Mon 12/2911:59 pmDEN - ISP
1 stop22h 00mFrontier
Deal found 12/20$473
This Frontier deal was found by Cheapflights users on 12/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:35 pmISP - DEN
1 stop13h 49mFrontier
Wed 12/3111:59 pmDEN - ISP
1 stop9h 26mFrontier
Deal found 12/21$582
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2412:30 pmISP - DEN
2 stops31h 27mMultiple Airlines
Thu 1/81:21 pmDEN - ISP
1 stop22h 00mMultiple Airlines
Deal found 12/20$651
This CheapOair deal was found by Cheapflights users on 12/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:00 amISP - DEN
1 stop10h 54mFrontier
Wed 12/3111:59 pmDEN - ISP
1 stop9h 26mFrontier
Deal found 12/19$703
This CheapOair deal was found by Cheapflights users on 12/22. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:35 pmISP - DEN
1 stop13h 49mFrontier
Sat 1/311:59 pmDEN - ISP
1 stop22h 00mFrontier
Deal found 12/22$712
This Frontier deal was found by Cheapflights users on 12/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/288:35 pmISP - DEN
1 stop13h 49mFrontier
Wed 12/3111:59 pmDEN - ISP
1 stop9h 26mFrontier
Deal found 12/20$722
This CheapOair deal was found by Cheapflights users on 12/22. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/288:35 pmISP - DEN
1 stop13h 49mFrontier
Sun 1/411:59 pmDEN - ISP
1 stop11h 10mFrontier
Deal found 12/22$727
This CheapOair deal was found by Cheapflights users on 12/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:00 amISP - DEN
1 stop28h 56mFrontier
Sun 12/2811:59 pmDEN - ISP
1 stop17h 41mFrontier
Deal found 12/20$752
This Southwest deal was found by Cheapflights users on 12/20. 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.
Mon 12/225:40 amISP - COS
1 stop8h 25mSouthwest
Fri 12/2612:45 pmCOS - ISP
1 stop9h 10mSouthwest
Deal found 12/20$1,082

Find flight deals from Islip to Colorado

Keep the following information in mind while searching for Islip to Colorado flight deals. Data was last updated December 22, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$166
(CheapOair)

One-way from

$81
(CheapOair)

Popular in

December

Cheapest in

January

Average price

$377
Provider with most accurate pricing for New York (NYC)-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Denver Intl flights.
Search Deals
From Islip Long Island to Colorado
Search Deals
One-way flight from Islip Long Island to Colorado
Search Deals
High demand for flights, 2% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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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 December 22, 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

Thu 1/22

7:43 pm-5:36 pm

1 stop23h 53m

Denver Intl

Sat 1/24

11:20 am-8:40 am

1 stop19h 20m

$166

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 1/8

8:40 pm-10:59 pm

1 stop28h 19m

Denver Intl

Wed 1/14

10:22 am-12:57 pm

1 stop24h 35m

$183

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Mon 1/26

7:43 pm-9:35 am

1 stop15h 52m

Denver Intl

Thu 2/12

6:00 am-4:12 pm

1 stop8h 12m

$183

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sat 1/17

6:47 pm-8:08 pm

1 stop27h 21m

Denver Intl

Wed 1/21

6:32 pm-6:48 pm

1 stop22h 16m

$202

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 1/8

8:40 pm-5:22 pm

1 stop22h 42m

Denver Intl

Sun 1/11

11:59 pm-7:51 pm

1 stop17h 52m

$218

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Mon 1/5

8:24 pm-10:59 pm

1 stop28h 35m

Denver Intl

Fri 1/9

11:59 pm-7:08 pm

1 stop17h 09m

$218

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 2/19

3:34 pm-7:39 am

2 stops18h 05m

Denver Intl

Mon 2/23

11:59 pm-8:40 am

1 stop30h 41m

$236

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Tue 1/13

8:00 am-11:23 am

1 stop29h 23m

Denver Intl

Sat 1/17

6:59 pm-8:55 am

1 stop11h 56m

$253

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Wed 1/14

8:00 am-8:20 am

1 stop26h 20m

Denver Intl

Sun 1/18

4:15 pm-7:50 pm

1 stop25h 35m

$268

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 1/15

7:58 pm-5:31 pm

1 stop23h 33m

Denver Intl

Sun 1/18

4:15 pm-7:50 pm

1 stop25h 35m

$268

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 19 results
1
2

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 $88). Flying from Islip, New York to Colorado in May is currently the most expensive (average of $143). 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 December 22, 2025.

It’s optimal to fly from Islip, New York to Colorado in the evening. By choosing this option you can save up to 63% on the cost of your flight, compared to a flight at noon.

How much does it cost to fly round-trip from Islip, New York to Colorado?

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 December 22, 2025.
Peruse reviews from past customers who have flown with Southwest 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
4,253 reviews

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,253 reviews
Southwest
8.0
Very good
4,253 reviews

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,076 reviews
Southwest
8.0
Very good
4,253 reviews

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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.

  • How long is the flight from Islip, New York to Colorado?

    Airlines like Frontier fly from Islip, New York to Colorado in about 23h 53m. The time it takes to get you to your destination can typically vary by up to . The distance between Islip, New York and Colorado is about 1654 mi.

  • 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 $88). Flying from Islip, New York to Colorado in May is currently the most expensive (average of $143). 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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Alternative routes for Islip to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
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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 December 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$190Average$260FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$388Average$521FlexibilityNo cancel feeOn-time63%

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