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Islip

$74+ Cheap flights from Colorado to Islip, NY (ISP)

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 2/27. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — ISP
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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Cheap flight deals from Colorado to Islip

Cheapest flights from Colorado to Islip
Explore the most affordable flight options available from Colorado to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 4, 2025.

This CheapOair deal was found by Cheapflights users on 12/3. 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 12/1011:00 pmDEN - ISP
1 stop11h 20mFrontier
Wed 12/1712:37 pmISP - DEN
1 stop22h 19mFrontier
Deal found 12/3$183
This Frontier deal was found by Cheapflights users on 12/2. 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.
Wed 12/1011:59 pmDEN - ISP
1 stop7h 14mFrontier
Sat 12/1310:19 amISP - DEN
1 stop14h 45mFrontier
Deal found 12/2$203
This CheapOair deal was found by Cheapflights users on 12/2. 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 12/1511:59 pmDEN - ISP
1 stop17h 35mFrontier
Wed 12/1712:37 pmISP - DEN
1 stop28h 17mFrontier
Deal found 12/2$204
This CheapOair deal was found by Cheapflights users on 12/2. 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 12/129:34 amDEN - ISP
1 stop8h 00mFrontier
Tue 12/168:29 pmISP - DEN
1 stop25h 44mFrontier
Deal found 12/2$208
This Mytrip deal was found by Cheapflights users on 12/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/186:00 amDEN - ISP
1 stop15h 31mFrontier
Mon 12/228:35 pmISP - DEN
1 stop28h 29mFrontier
Deal found 12/3$216
This CheapOair deal was found by Cheapflights users on 12/1. 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 12/87:00 amDEN - ISP
1 stop14h 59mFrontier
Thu 12/1110:19 amISP - DEN
1 stop24h 05mFrontier
Deal found 12/1$225
This CheapOair deal was found by Cheapflights users on 12/2. 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 12/1711:59 pmDEN - ISP
1 stop21h 32mFrontier
Sat 12/206:40 pmISP - DEN
1 stop15h 44mFrontier
Deal found 12/2$228
This CheapOair deal was found by Cheapflights users on 12/2. 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 12/129:34 amDEN - ISP
1 stop21h 39mFrontier
Mon 12/1510:19 amISP - DEN
1 stop14h 45mFrontier
Deal found 12/2$229
This CheapOair deal was found by Cheapflights users on 12/2. 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 12/129:34 amDEN - ISP
1 stop8h 00mFrontier
Sun 12/1411:15 amISP - DEN
1 stop13h 49mFrontier
Deal found 12/2$233
This CheapOair deal was found by Cheapflights users on 12/2. 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 12/811:59 pmDEN - ISP
1 stop17h 35mFrontier
Wed 12/106:00 amISP - DEN
1 stop28h 24mFrontier
Deal found 12/2$234
This CheapOair deal was found by Cheapflights users on 12/3. 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 12/1611:59 pmDEN - ISP
1 stop20h 45mFrontier
Fri 12/198:35 pmISP - DEN
1 stop28h 29mFrontier
Deal found 12/3$238
This Frontier deal was found by Cheapflights users on 12/2. 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.
Wed 12/3111:59 pmDEN - ISP
1 stop9h 26mFrontier
Thu 1/88:40 pmISP - DEN
1 stop13h 44mFrontier
Deal found 12/2$248

Find flight deals from Colorado to Islip

Keep the following information in mind while searching for Colorado to Islip flight deals. Data was last updated December 4, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$166
(CheapOair)

One-way from

$74
(Frontier)

Popular in

March

Cheapest in

January

Average price

$296
Provider with most accurate pricing for Denver Intl-New York (NYC) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-New York (NYC) flights.
Search Deals
From Colorado to Islip Long Island
Search Deals
One-way flight from Colorado to Islip Long Island
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to Islip 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 4, 2025.
Use the filters below to find and compare flights from Colorado to Islip that are best for you.

Fly from

Colorado

Fly to

Islip

Route

Depart

Return

Price

DenverIslip

DEN - ISP

DENISP

Denver Intl

Sat 1/24

6:32 pm-8:40 am

1 stop12h 08m

Islip Long Island

Thu 1/29

7:43 pm-8:30 am

1 stop14h 47m

$183

DenverIslip

DEN - ISP

DENISP

Denver Intl

Mon 12/15

7:00 am-11:59 pm

1 stop14h 59m

Islip Long Island

Tue 12/16

8:29 pm-11:04 pm

1 stop28h 35m

$204

DenverIslip

DEN - ISP

DENISP

Denver Intl

Mon 12/15

7:00 am-11:59 pm

1 stop14h 59m

Islip Long Island

Wed 12/17

6:00 am-11:04 pm

1 stop19h 04m

$204

DenverIslip

DEN - ISP

DENISP

Denver Intl

Tue 12/16

11:59 pm-10:44 pm

1 stop20h 45m

Islip Long Island

Fri 12/19

8:35 pm-11:04 pm

1 stop28h 29m

$208

DenverIslip

DEN - ISP

DENISP

Denver Intl

Thu 1/15

9:27 am-7:50 pm

1 stop8h 23m

Islip Long Island

Sun 1/18

7:58 pm-8:20 am

1 stop14h 22m

$217

DenverIslip

DEN - ISP

DENISP

Denver Intl

Fri 2/27

9:00 am-2:19 pm

1 stop27h 19m

Islip Long Island

Wed 3/4

7:41 pm-11:04 pm

1 stop29h 23m

$218

DenverIslip

DEN - ISP

DENISP

Denver Intl

Mon 12/15

11:59 pm-7:34 pm

1 stop17h 35m

Islip Long Island

Thu 12/18

6:00 am-2:54 pm

1 stop10h 54m

$229

DenverIslip

DEN - ISP

DENISP

Denver Intl

Thu 2/26

11:59 pm-4:06 pm

1 stop14h 07m

Islip Long Island

Mon 3/2

7:41 pm-12:52 pm

1 stop19h 11m

$234

DenverIslip

DEN - ISP

DENISP

Denver Intl

Thu 3/5

11:59 pm-7:11 pm

1 stop17h 12m

Islip Long Island

Sun 3/8

8:19 pm-5:33 pm

1 stop23h 14m

$239

DenverIslip

DEN - ISP

DENISP

Denver Intl

Fri 2/6

6:15 am-6:38 pm

1 stop10h 23m

Islip Long Island

Mon 2/9

7:43 pm-12:52 pm

1 stop19h 09m

$239

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/2

Showing 1-10 of 20 results
1
2

Best time to book a flight from Colorado to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Colorado 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 Colorado to Islip

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

Currently, October is the cheapest month in which you can book a flight from Colorado to Islip, New York (average of $65). Flying from Colorado to Islip, New York in June is currently the most expensive (average of $168). 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 CO to ISP?

Find hourly flight availability from Colorado to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 4, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 58% on flights from Colorado to Islip, New York by exploring options for tickets in the evening.

Related info for your journey

Find useful and relevant information for your journey from Colorado to Islip. 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 into for flights to Islip from Colorado?

    Islip Long Island (ISP) is the airport you will fly into if you book a flight from Colorado to Islip. It is only a 7.2 mi journey from Long Island (ISP) to Islip’s city center.

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

    There are many flights that can get you from Colorado to Islip, New York in 10h 30m. Fly via Frontier or Southwest to get the fastest option. The distance from Colorado to Islip, New York is about 1673 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Colorado to Islip 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 Colorado to Islip, New York?

    Currently, October is the cheapest month in which you can book a flight from Colorado to Islip, New York (average of $65). Flying from Colorado to Islip, New York in June is currently the most expensive (average of $168). 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

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead

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Alternative routes for Colorado to Islip

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Top airline flying from Colorado to Islip

Discover the top airline that operate flights from Colorado to Islip. 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 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$357Average$454FlexibilityNo cancel feeOn-time63%

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