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$100+ Cheap flights from Islip (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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — DEN
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
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 September 15, 2025.

Round-trip from

$169
(Priceline)

One-way from

$100
(Cheapflightsfares)

Popular in

December

Cheapest in

October

Average price

$282
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, 2% 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 September 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 September 15, 2025.

This Priceline deal was found by Cheapflights users on 9/13. 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.
Sun 9/289:49 amISP - DEN
1 stop12h 15mFrontier
Thu 10/211:59 pmDEN - ISP
1 stop7h 05mFrontier
Deal found 9/13$169
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/275:05 pmISP - DEN
1 stop8h 08mFrontier
Sat 10/411:59 pmDEN - ISP
1 stop7h 05mFrontier
Deal found 9/13$177
This Frontier deal was found by Cheapflights users on 9/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/289:49 amISP - DEN
1 stop12h 15mFrontier
Sat 10/411:59 pmDEN - ISP
1 stop7h 05mFrontier
Deal found 9/13$179
This CheapOair deal was found by Cheapflights users on 9/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/265:05 pmISP - DEN
1 stop17h 49mFrontier
Mon 9/299:00 amDEN - ISP
1 stop23h 40mFrontier
Deal found 9/13$185
This CheapOair deal was found by Cheapflights users on 9/14. 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 10/1812:38 pmISP - DEN
1 stop10h 01mFrontier
Fri 10/2412:36 amDEN - ISP
1 stop8h 01mFrontier
Deal found 9/14$202
This CheapOair deal was found by Cheapflights users on 9/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/99:37 pmISP - DEN
1 stop27h 39mFrontier
Mon 10/1311:59 pmDEN - ISP
1 stop7h 45mFrontier
Deal found 9/15$203
This CheapOair deal was found by Cheapflights users on 9/12. 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 10/35:12 pmISP - DEN
1 stop17h 37mFrontier
Thu 10/1612:36 amDEN - ISP
1 stop8h 01mFrontier
Deal found 9/12$206
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 10/169:49 amISP - DEN
2 stops11h 55mFrontier
Mon 10/2011:59 pmDEN - ISP
1 stop7h 45mFrontier
Deal found 9/14$209
This Priceline deal was found by Cheapflights users on 9/14. 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.
Tue 10/1410:39 amISP - DEN
1 stop8h 30mFrontier
Tue 10/2111:59 pmDEN - ISP
1 stop7h 45mFrontier
Deal found 9/14$210
This Southwest deal was found by Cheapflights users on 9/14. 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.
Tue 10/141:10 pmISP - COS
2 stops11h 00mSouthwest
Tue 10/217:10 amCOS - ISP
1 stop6h 55mSouthwest
Deal found 9/14$407

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 September 15, 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 10/3

9:49 am-8:49 am

1 stop25h 00m

Denver Intl

Fri 10/17

11:59 pm-11:53 am

1 stop9h 54m

$169

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Mon 10/6

5:05 pm-11:13 pm

1 stop8h 08m

Denver Intl

Wed 10/8

11:59 pm-9:04 am

1 stop7h 05m

$177

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sat 9/27

5:05 pm-11:13 pm

1 stop8h 08m

Denver Intl

Sat 10/4

11:59 pm-9:04 am

1 stop7h 05m

$177

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sun 9/28

9:49 am-8:04 pm

1 stop12h 15m

Denver Intl

Fri 10/3

12:04 am-10:55 am

1 stop8h 51m

$179

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 9/26

5:05 pm-11:13 pm

1 stop8h 08m

Denver Intl

Sat 9/27

11:59 pm-9:04 am

1 stop7h 05m

$199

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sun 9/28

5:12 pm-8:58 am

2 stops17h 46m

Denver Intl

Thu 10/2

11:59 pm-9:04 am

1 stop7h 05m

$208

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Mon 10/13

4:58 pm-11:16 pm

1 stop8h 18m

Denver Intl

Mon 10/20

11:59 pm-9:44 am

1 stop7h 45m

$209

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 10/16

9:49 am-7:44 pm

2 stops11h 55m

Denver Intl

Mon 10/20

11:59 pm-9:44 am

1 stop7h 45m

$209

IslipColorado Springs

ISP - COS

ISPCOS

Islip Long Island

Tue 10/14

1:10 pm-10:10 pm

2 stops11h 00m

Colorado Springs

Tue 10/21

7:10 am-4:05 pm

1 stop6h 55m

$407

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sat 9/27

5:05 pm-11:13 pm

1 stop8h 08m

$100

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 16 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 to Colorado?

Currently, October is the cheapest month in which you can book a flight from Islip to Colorado (average of $197). Flying from Islip 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 September 15, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Islip 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 September 15, 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
4,242 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,172 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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 to Colorado?

    Departing from Islip to Colorado will take you 11h. Islip and Colorado are separated by a distance of 1673 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

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

    Currently, October is the cheapest month in which you can book a flight from Islip to Colorado (average of $197). Flying from Islip 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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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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$148Average$260FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$377Average$521FlexibilityNo cancel feeOn-time63%

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