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$69+ 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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — DEN
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
1 adult, Economy
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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 November 6, 2025.

This CheapOair deal was found by Cheapflights users on 11/6. 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 12/36:00 amISP - DEN
1 stop19h 04mFrontier
Thu 12/411:00 pmDEN - ISP
1 stop22h 59mFrontier
Deal found 11/6$130
This CheapOair deal was found by Cheapflights users on 11/6. 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 12/410:19 amISP - DEN
1 stop14h 45mFrontier
Sun 12/79:34 amDEN - ISP
1 stop21h 39mFrontier
Deal found 11/6$134
This CheapOair deal was found by Cheapflights users on 11/6. 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 11/2010:02 amISP - DEN
1 stop24h 17mFrontier
Mon 11/2412:59 amDEN - ISP
1 stop21h 00mFrontier
Deal found 11/6$137
This CheapOair deal was found by Cheapflights users on 11/4. 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 12/36:00 amISP - DEN
1 stop28h 24mFrontier
Sat 12/611:00 pmDEN - ISP
1 stop10h 11mFrontier
Deal found 11/4$138
This CheapOair deal was found by Cheapflights users on 11/5. 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 12/128:29 pmISP - DEN
1 stop13h 55mFrontier
Wed 12/1711:59 pmDEN - ISP
1 stop21h 32mFrontier
Deal found 11/5$142
This CheapOair deal was found by Cheapflights users on 11/6. 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 11/249:02 amISP - DEN
1 stop15h 57mFrontier
Thu 11/2712:59 amDEN - ISP
1 stop21h 00mFrontier
Deal found 11/6$144
This CheapOair deal was found by Cheapflights users on 11/6. 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 11/179:54 amISP - DEN
1 stop26h 04mFrontier
Thu 11/209:19 amDEN - ISP
1 stop23h 18mFrontier
Deal found 11/6$184
This Kiwi.com deal was found by Cheapflights users on 11/5. 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.
Mon 12/86:00 amISP - DEN
1 stop29h 10mFrontier
Fri 12/121:42 pmDEN - ISP
2 stops17h 31mFrontier
Deal found 11/5$208
This Expedia deal was found by Cheapflights users on 11/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2010:02 amISP - DEN
1 stop24h 17mFrontier
Mon 11/2411:59 pmDEN - ISP
1 stop8h 19mFrontier
Deal found 11/5$221
This CheapOair deal was found by Cheapflights users on 11/5. 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 11/124:58 pmISP - DEN
1 stop8h 18mFrontier
Thu 11/136:00 amDEN - ISP
1 stop24h 54mFrontier
Deal found 11/5$222
This CheapOair deal was found by Cheapflights users on 11/6. 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 12/106:00 amISP - DEN
1 stop19h 04mFrontier
Thu 12/1111:00 pmDEN - ISP
1 stop22h 59mFrontier
Deal found 11/6$226
This CheapOair deal was found by Cheapflights users on 11/4. 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 12/64:05 pmISP - DEN
1 stop19h 05mFrontier
Mon 12/86:31 pmDEN - ISP
1 stop23h 03mFrontier
Deal found 11/4$236

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 November 6, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$130
(CheapOair)

One-way from

$69
(CheapOair)

Popular in

December

Cheapest in

November

Average price

$277
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, 3% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 6, 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 11/20

10:02 am-8:19 am

1 stop24h 17m

Denver Intl

Wed 12/3

11:59 pm-9:13 am

1 stop7h 14m

$130

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Wed 12/3

6:00 am-11:04 pm

1 stop19h 04m

Denver Intl

Sat 12/6

11:59 pm-10:20 am

1 stop8h 21m

$130

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Wed 12/3

6:00 am-11:04 pm

1 stop19h 04m

Denver Intl

Thu 12/4

11:00 pm-11:59 pm

1 stop22h 59m

$130

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Mon 12/8

10:19 am-11:04 pm

1 stop14h 45m

Denver Intl

Fri 12/12

7:00 am-3:10 pm

1 stop30h 10m

$134

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 11/20

10:02 am-8:19 am

1 stop24h 17m

Denver Intl

Mon 11/24

12:59 am-11:59 pm

1 stop21h 00m

$137

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 1/22

11:35 am-11:04 pm

1 stop13h 29m

Denver Intl

Sun 1/25

11:59 pm-10:40 am

1 stop8h 41m

$138

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 2/27

5:03 pm-12:52 pm

1 stop21h 49m

Denver Intl

Sun 3/1

4:50 pm-10:40 am

1 stop15h 50m

$142

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Tue 11/25

9:09 pm-10:59 pm

1 stop27h 50m

Denver Intl

Thu 11/27

12:59 am-11:59 pm

1 stop21h 00m

$144

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 2/26

10:42 am-7:50 am

1 stop23h 08m

Denver Intl

Wed 3/4

4:50 pm-9:47 am

1 stop14h 57m

$146

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 1/9

3:34 pm-11:04 pm

1 stop9h 30m

Denver Intl

Tue 1/13

11:38 am-11:39 am

1 stop22h 01m

$180

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 21 results
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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 $89). 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 November 6, 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 November 6, 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
4,241 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Food

7.0

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
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Food

7.0

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
3,116 reviews
Southwest
8.0
Very good
4,241 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Crew

8.6

Food

7.0

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, New York to Colorado?

    Airlines like Frontier fly from Islip, New York to Colorado in about 24h 17m. 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 - Montrose County or Islip Long Island - Colorado Springs 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 $89). 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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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 November 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$148Average$217FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$388Average$521FlexibilityNo cancel feeOn-time63%

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