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$82+ 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 3/7. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — DEN
Feb 10 — Feb 171
Tue 2/10
Tue 2/17
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 January 11, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$179
(Frontier)

One-way from

$82
(CheapOair)

Popular in

December

Cheapest in

January

Average price

$267
Provider with most accurate pricing for New York (NYC)-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Denver Intl flights.
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From Islip Long Island to Colorado
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One-way flight from Islip Long Island to Colorado
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High demand for flights, 4% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 11, 2026.

This Frontier deal was found by Cheapflights users on 1/10. 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 2/19:25 amISP - DEN
1 stop8h 46mFrontier
Sat 2/76:32 pmDEN - ISP
1 stop12h 08mFrontier
Deal found 1/10$179
This CheapOair deal was found by Cheapflights users on 1/9. 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.
Sat 3/710:43 amISP - DEN
1 stop22h 35mFrontier
Thu 3/1211:59 pmDEN - ISP
1 stop10h 48mFrontier
Deal found 1/9$186
This CheapOair deal was found by Cheapflights users on 1/9. 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.
Fri 2/69:43 pmISP - DEN
1 stop14h 17mFrontier
Tue 2/1011:59 pmDEN - ISP
1 stop11h 14mFrontier
Deal found 1/9$191
This CheapOair deal was found by Cheapflights users on 1/9. 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.
Sat 1/178:00 amISP - DEN
1 stop26h 20mFrontier
Sat 1/316:32 pmDEN - ISP
1 stop12h 08mFrontier
Deal found 1/9$197
This Frontier deal was found by Cheapflights users on 1/9. 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.
Fri 2/69:43 pmISP - DEN
1 stop14h 17mFrontier
Sun 2/89:41 amDEN - ISP
1 stop7h 07mFrontier
Deal found 1/9$210
This CheapOair deal was found by Cheapflights users on 1/9. 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 2/17:53 pmISP - DEN
1 stop21h 49mFrontier
Sun 2/89:41 amDEN - ISP
1 stop7h 07mFrontier
Deal found 1/9$211
This Kiwi.com deal was found by Cheapflights users on 1/9. 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.
Sat 2/711:50 amISP - DEN
2 stops22h 40mMultiple Airlines
Sat 2/1411:59 pmDEN - ISP
1 stop17h 07mMultiple Airlines
Deal found 1/9$214
This Frontier deal was found by Cheapflights users on 1/9. 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.
Sat 3/710:43 amISP - DEN
1 stop14h 25mFrontier
Wed 3/1111:59 pmDEN - ISP
1 stop14h 14mFrontier
Deal found 1/9$215
This CheapOair deal was found by Cheapflights users on 1/8. 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 2/182:03 pmISP - DEN
1 stop10h 56mFrontier
Sat 2/2111:59 pmDEN - ISP
1 stop29h 39mFrontier
Deal found 1/8$216
This CheapOair deal was found by Cheapflights users on 1/9. 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 2/182:03 pmISP - DEN
1 stop19h 52mFrontier
Wed 2/256:20 pmDEN - ISP
1 stop18h 19mFrontier
Deal found 1/9$227
This Cheapflightsfares deal was found by Cheapflights users on 1/9. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/19:25 amISP - DEN
1 stop8h 46mFrontier
Fri 2/69:41 amDEN - ISP
1 stop6h 57mFrontier
Deal found 1/9$235
This Cheapflightsfares deal was found by Cheapflights users on 1/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/53:34 pmISP - DEN
1 stop9h 25mFrontier
Sun 3/812:13 amDEN - ISP
1 stop7h 35mFrontier
Deal found 1/10$244

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 January 11, 2026.
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

Sat 3/7

10:43 am-7:18 am

1 stop22h 35m

Denver Intl

Thu 3/12

11:59 pm-12:47 pm

1 stop10h 48m

$186

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 2/6

9:43 pm-10:00 am

1 stop14h 17m

Denver Intl

Sun 2/8

9:41 am-6:48 pm

1 stop7h 07m

$210

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 2/27

8:33 am-7:55 am

1 stop25h 22m

Denver Intl

Sat 2/28

11:59 pm-7:38 am

1 stop29h 39m

$211

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sat 3/7

10:43 am-11:08 pm

1 stop14h 25m

Denver Intl

Wed 3/11

11:59 pm-4:13 pm

1 stop14h 14m

$215

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Wed 2/18

2:03 pm-10:59 pm

1 stop10h 56m

Denver Intl

Sat 2/21

11:59 pm-7:38 am

1 stop29h 39m

$216

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sun 2/1

9:25 am-4:11 pm

1 stop8h 46m

Denver Intl

Fri 2/6

9:41 am-6:38 pm

1 stop6h 57m

$235

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 3/5

3:34 pm-10:59 pm

1 stop9h 25m

Denver Intl

Sun 3/8

12:13 am-9:48 am

1 stop7h 35m

$244

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sun 3/29

5:08 pm-8:20 am

1 stop17h 12m

Denver Intl

Sat 4/4

11:59 pm-7:11 pm

1 stop17h 12m

$246

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 3/26

5:08 pm-8:20 am

1 stop17h 12m

Denver Intl

Sun 3/29

12:13 am-9:48 am

1 stop7h 35m

$251

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 2/5

7:43 pm-8:30 am

1 stop14h 47m

Denver Intl

Sun 2/8

6:15 am-6:48 pm

1 stop10h 33m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/9

Showing 1-10 of 17 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.

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 January 11, 2026.
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
4,252 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
4,252 reviews
Southwest
8.0
Very good
4,252 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
5.7
Fair
3,059 reviews
Southwest
8.0
Very good
4,252 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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 22h 35m. 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

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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 January 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$190Average$260FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$377Average$521FlexibilityNo cancel feeOn-time63%

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