HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Colorado

$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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — DEN
ago. 31 — sep. 71
dom. 8/31
dom. 9/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to Colorado with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 agosto 26, 2025.

Round-trip from

$169
(CheapOair)

One-way from

$100
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$322
From Islip Long Island to Colorado
Search Deals
One-way flight from Islip Long Island to Colorado
Search Deals
High demand for flights, 1% potential price rise
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 August 2025
Search Deals

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 agosto 26, 2025.

This CheapOair deal was found by Cheapflights users on 8/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/125:12 pmISP - DEN
1 stop17h 37mFrontier
lun. 9/157:01 pmDEN - ISP
1 stop13h 39mFrontier
Deal found 8/26$169
This Cheapflightsfares deal was found by Cheapflights users on 8/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/55:05 pmISP - DEN
1 stop8h 08mFrontier
sáb. 9/611:59 pmDEN - ISP
1 stop7h 05mFrontier
Deal found 8/24$200
This CheapOair deal was found by Cheapflights users on 8/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/115:12 pmISP - DEN
1 stop17h 24mFrontier
jue. 10/2312:36 amDEN - ISP
1 stop8h 01mFrontier
Deal found 8/24$201
This Cheapflightsfares deal was found by Cheapflights users on 8/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/155:05 pmISP - DEN
1 stop8h 08mFrontier
jue. 9/1811:59 pmDEN - ISP
1 stop7h 05mFrontier
Deal found 8/26$202
This Cheapflightsfares deal was found by Cheapflights users on 8/25. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/65:05 pmISP - DEN
1 stop8h 08mFrontier
sáb. 9/1311:59 pmDEN - ISP
1 stop7h 05mFrontier
Deal found 8/25$205
This CheapOair deal was found by Cheapflights users on 8/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/911:25 amISP - DEN
1 stop24h 49mFrontier
sáb. 9/1312:04 amDEN - ISP
1 stop8h 36mFrontier
Deal found 8/25$206
This FlightHub deal was found by Cheapflights users on 8/24. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/319:54 amISP - DEN
1 stop25h 14mFrontier
dom. 11/212:16 amDEN - ISP
1 stop8h 21mFrontier
Deal found 8/24$209
This Frontier deal was found by Cheapflights users on 8/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/1811:40 amISP - DEN
1 stop13h 33mFrontier
sáb. 9/2012:13 amDEN - ISP
1 stop8h 27mFrontier
Deal found 8/25$222
This CheapOair deal was found by Cheapflights users on 8/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/54:58 pmISP - DEN
1 stop17h 17mFrontier
dom. 11/96:00 amDEN - ISP
1 stop25h 09mFrontier
Deal found 8/26$230
This Cheapflightsfares deal was found by Cheapflights users on 8/25. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/274:58 pmISP - DEN
1 stop8h 18mFrontier
jue. 10/3011:59 pmDEN - ISP
1 stop7h 10mFrontier
Deal found 8/25$233
This Cheapflightsfares deal was found by Cheapflights users on 8/25. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/155:05 pmISP - DEN
1 stop8h 08mFrontier
jue. 9/2511:59 pmDEN - ISP
1 stop7h 05mFrontier
Deal found 8/25$234

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 agosto 26, 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

vie. 9/26

5:05 pm-8:54 am

1 stop17h 49m

Denver Intl

lun. 9/29

7:01 pm-10:40 am

1 stop13h 39m

$169

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

vie. 11/14

9:54 am-9:08 am

1 stop25h 14m

Denver Intl

lun. 11/17

12:16 am-5:42 pm

1 stop15h 26m

$169

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

sáb. 10/4

5:18 pm-8:36 am

1 stop17h 18m

Denver Intl

mar. 10/7

12:36 am-10:57 am

1 stop8h 21m

$169

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

vie. 9/12

5:12 pm-8:49 am

1 stop17h 37m

Denver Intl

lun. 9/15

7:01 pm-10:40 am

1 stop13h 39m

$169

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

lun. 9/15

5:05 pm-11:13 pm

1 stop8h 08m

Denver Intl

mié. 9/17

11:19 am-10:55 am

1 stop21h 36m

$169

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

vie. 9/5

5:05 pm-11:13 pm

1 stop8h 08m

Denver Intl

sáb. 9/6

11:59 pm-9:04 am

1 stop7h 05m

$200

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

vie. 9/12

5:05 pm-11:13 pm

1 stop8h 08m

Denver Intl

sáb. 9/13

11:59 pm-9:04 am

1 stop7h 05m

$200

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

jue. 9/11

5:12 pm-8:36 am

1 stop17h 24m

Denver Intl

jue. 10/23

12:36 am-10:37 am

1 stop8h 01m

$201

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

mié. 11/5

4:58 pm-11:16 pm

1 stop8h 18m

Denver Intl

mié. 11/12

2:00 pm-9:09 am

1 stop17h 09m

$201

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

mié. 10/1

11:35 am-8:09 am

1 stop22h 34m

Denver Intl

vie. 10/3

11:59 pm-4:23 pm

1 stop14h 24m

$201

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/24

Showing 1-10 of 20 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 agosto 26, 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 agosto 26, 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

Entertainment

7.5

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

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

Entertainment

7.5

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

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
3,200 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

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 17h 49m. Islip and Colorado are separated by a distance of 1654 mi.

  • What are the most popular routes from Islip 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 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Islip to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
Newark to Fort Lauderdale flights
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to O'Hare Intl flights
John F Kennedy Intl to Miami flights
Newark to Miami flights
Newark to Los Angeles flights
Newark to Las Vegas flights
LaGuardia to Fort Lauderdale flights
John F Kennedy Intl to Las Vegas flights
Newark to O'Hare Intl flights
LaGuardia to O'Hare Intl flights
John F Kennedy Intl to Orlando flights
LaGuardia to Dallas/Fort Worth flights
LaGuardia to Miami flights
John F Kennedy Intl to San Francisco flights
Newark to Orlando flights
John F Kennedy Intl to Fort Lauderdale flights
John F Kennedy Intl to Dallas/Fort Worth flights
John F Kennedy Intl to Atlanta flights
LaGuardia to Orlando flights
LaGuardia to Los Angeles flights
John F Kennedy Intl to Denver flights
John F Kennedy Intl to Sky Harbor Intl flights
Newark to San Francisco flights
John F Kennedy Intl to Ontario flights
Newark to Hobby flights
Newark to Dallas/Fort Worth flights
LaGuardia to Atlanta flights
Newark to Atlanta flights
LaGuardia to Denver flights
Newark to Denver flights
LaGuardia to Las Vegas flights
Newark to Sky Harbor Intl flights
John F Kennedy Intl to Seattle flights
LaGuardia to Hobby flights
John F Kennedy Intl to West Palm Beach flights
Newark to Tampa flights
John F Kennedy Intl to Tampa flights
John F Kennedy Intl to Hobby flights
LaGuardia to Tampa flights
John F Kennedy Intl to San Diego flights
John F Kennedy Intl to Nashville flights
John F Kennedy Intl to Honolulu flights
John F Kennedy Intl to New Orleans flights
Newark to George Bush Intcntl flights
John F Kennedy Intl to Austin flights
Newark to Seattle flights
John F Kennedy Intl to Charlotte flights
Newark to Nashville flights
Newark to Austin flights

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 agosto 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$148Average$260FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$377Average$521FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.