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$95+ 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 4/16. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — DEN
Mar 30 — Apr 61
Mon 3/30
Mon 4/6
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 February 28, 2026.

This Expedia deal was found by Cheapflights users on 2/24. 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 4/234:07 pm
ISP
-
DEN
1 stop18h 14m
Frontier
Sun 4/2611:59 pm
DEN
-
ISP
1 stop17h 37m
Frontier
Deal found 2/24$190
This Orbitz deal was found by Cheapflights users on 2/24. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/48:31 pm
ISP
-
DEN
1 stop28h 28m
Frontier
Thu 5/73:41 pm
DEN
-
ISP
1 stop15h 32m
Frontier
Deal found 2/24$240
This Priceline deal was found by Cheapflights users on 2/25. 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.
Thu 4/234:07 pm
ISP
-
DEN
1 stop8h 52m
Frontier
Thu 4/3011:59 pm
DEN
-
ISP
1 stop7h 14m
Frontier
Deal found 2/25$260
This Kiwi.com deal was found by Cheapflights users on 2/25. 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 3/2511:50 am
ISP
-
DEN
2 stops13h 14m
Multiple Airlines
Tue 3/3112:59 am
DEN
-
ISP
1 stop17h 53m
Multiple Airlines
Deal found 2/25$261
This Frontier deal was found by Cheapflights users on 2/23. 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 3/18:33 am
ISP
-
DEN
1 stop11h 47m
Frontier
Sun 3/812:13 am
DEN
-
ISP
1 stop7h 50m
Frontier
Deal found 2/23$316
This Kiwi.com deal was found by Cheapflights users on 2/25. 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.
Thu 4/234:07 pm
ISP
-
DEN
1 stop18h 14m
Multiple Airlines
Thu 4/3011:59 pm
DEN
-
ISP
2 stops11h 32m
Multiple Airlines
Deal found 2/25$322
This Frontier deal was found by Cheapflights users on 2/23. 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 am
ISP
-
DEN
1 stop14h 25m
Frontier
Thu 3/1212:18 am
DEN
-
ISP
1 stop7h 30m
Frontier
Deal found 2/23$335
This Priceline deal was found by Cheapflights users on 2/26. 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.
Fri 2/273:34 pm
ISP
-
DEN
1 stop9h 25m
Frontier
Sun 3/17:24 pm
DEN
-
ISP
1 stop10h 14m
Frontier
Deal found 2/26$340
This Southwest deal was found by Cheapflights users on 2/24. 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 5/44:30 pm
ISP
-
DEN
2 stops9h 55m
Southwest
Thu 5/712:45 pm
DEN
-
ISP
2 stops8h 45m
Southwest
Deal found 2/24$349
This Southwest deal was found by Cheapflights users on 2/26. 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.
Wed 3/186:10 am
ISP
-
COS
2 stops12h 30m
Southwest
Sun 3/228:00 pm
COS
-
ISP
2 stops13h 40m
Southwest
Deal found 2/26$750

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 February 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$190
(Expedia)

One-way from

$95
(CheapOair)

Popular in

February

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
Highest demand for flights based on searches. 2% potential increase in price ($7 potential increase over avg. RT price).
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 February 2026
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 February 28, 2026.
Use the filters below to find and compare flights from Islip to Colorado that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Mon 5/4

4:30 pm-12:25 am

2 stops9h 55m

Denver Intl

Thu 5/7

12:45 pm-11:30 pm

2 stops8h 45m

$349

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Wed 3/25

5:45 am-2:25 pm

2 stops10h 40m

Denver Intl

Wed 4/1

12:25 pm-10:50 pm

2 stops8h 25m

$390

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 3/13

2:31 pm-8:55 pm

1 stop8h 24m

Denver Intl

Tue 3/17

12:30 pm-11:10 am

1 stop20h 40m

$393

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 4/23

4:30 pm-11:15 pm

2 stops8h 45m

Denver Intl

Sun 4/26

11:50 pm-12:05 pm

1 stop10h 15m

$397

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 4/23

4:30 pm-11:15 pm

2 stops8h 45m

Denver Intl

Thu 4/30

6:35 am-4:30 pm

2 stops7h 55m

$418

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sat 5/23

4:25 pm-10:00 pm

1 stop7h 35m

Denver Intl

Sat 5/30

5:30 am-4:00 pm

1 stop8h 30m

$447

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 6/11

5:20 am-11:00 am

1 stop7h 40m

Denver Intl

Fri 6/12

5:30 am-2:30 pm

1 stop7h 00m

$447

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Wed 6/10

6:00 am-11:10 am

1 stop7h 10m

Denver Intl

Fri 6/12

11:55 pm-9:45 am

1 stop7h 50m

$447

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Tue 6/9

4:40 pm-11:40 pm

2 stops9h 00m

Denver Intl

Sat 6/13

5:35 am-4:55 pm

2 stops9h 20m

$457

IslipColorado Springs

ISP - COS

ISPCOS

Islip Long Island

Wed 3/18

6:10 am-4:40 pm

2 stops12h 30m

Colorado Springs

Sun 3/22

8:00 pm-11:40 am

2 stops13h 40m

$750

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/26

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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, January is the cheapest month in which you can book a flight from Islip, New York to Colorado (average of $85). Flying from Islip, New York to Colorado in May is currently the most expensive (average of $141). 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 February 28, 2026.
Peruse reviews from past customers who have flown with Southwest 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
4,303 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
Southwest
8.0
Very good
4,303 reviews
Southwest
8.0
Very good
4,303 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.

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 Southwest fly from Islip, New York to Colorado in about 9h 55m. 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, January is the cheapest month in which you can book a flight from Islip, New York to Colorado (average of $85). Flying from Islip, New York to Colorado in May is currently the most expensive (average of $141). 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 airline flying from Islip to Colorado

Discover the top airline 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 February 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$377Average$521FlexibilityNo cancel feeOn-time63%

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