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Cheap flights from Islip, New York to Colorado from $81

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to Colorado departing on 2/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Islip, New York to Colorado

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
7:43 pm - 5:36 pm
ISP
-
DEN
23h 53m1 stop
Frontier Logo
11:20 am - 8:40 am
DEN
-
ISP
19h 20m1 stop
$166Frontier
Thu, Jan 22 - Sat, Jan 24
Frontier Logo
7:56 pm - 10:59 pm
ISP
-
DEN
29h 03m1 stop
Frontier Logo
4:15 pm - 7:50 pm
DEN
-
ISP
25h 35m1 stop
$183Frontier
Sat, Jan 10 - Thu, Jan 15
Frontier Logo
3:34 pm - 7:55 am
ISP
-
DEN
18h 21m1 stop
Frontier Logo
11:59 pm - 2:39 pm
DEN
-
ISP
12h 40m1 stop
$201Frontier
Fri, Feb 27 - Wed, Mar 4
Frontier Logo
6:47 pm - 8:08 pm
ISP
-
DEN
27h 21m1 stop
Frontier Logo
6:32 pm - 6:48 pm
DEN
-
ISP
22h 16m1 stop
$202Frontier
Sat, Jan 17 - Wed, Jan 21
Frontier Logo
8:40 pm - 5:22 pm
ISP
-
DEN
22h 42m1 stop
Frontier Logo
11:59 pm - 7:51 pm
DEN
-
ISP
17h 52m1 stop
$218Frontier
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
8:40 pm - 10:59 pm
ISP
-
DEN
28h 19m1 stop
Frontier Logo
4:15 pm - 7:50 pm
DEN
-
ISP
25h 35m1 stop
$221Frontier
Thu, Jan 8 - Thu, Jan 15
Frontier Logo
7:56 pm - 8:24 am
ISP
-
DEN
14h 28m1 stop
Frontier Logo
12:20 pm - 10:46 pm
DEN
-
ISP
8h 26m1 stop
$233Frontier
Sat, Jan 10 - Wed, Jan 14
Frontier Logo
8:45 pm - 7:28 am
ISP
-
DEN
36h 43m2 stops
Frontier Logo
9:41 am - 8:47 pm
DEN
-
ISP
9h 06m1 stop
$236Frontier
Fri, Jan 16 - Fri, Jan 23
Frontier Logo
8:00 am - 11:23 am
ISP
-
DEN
29h 23m1 stop
Frontier Logo
6:59 pm - 8:55 am
DEN
-
ISP
11h 56m1 stop
$253Frontier
Tue, Jan 13 - Sat, Jan 17
Frontier Logo
8:00 am - 8:20 am
ISP
-
DEN
26h 20m1 stop
Frontier Logo
4:15 pm - 7:50 pm
DEN
-
ISP
25h 35m1 stop
$268Frontier
Wed, Jan 14 - Sun, Jan 18

Frontier flights from Islip, New York to Colorado

Our best Frontier deals on Islip, New York to Colorado flight tickets
Frontier
Jan 22
ISP7:43 pmIslip Long Island
23h 53m
1 stop
DEN5:36 pmDenver Intl
Jan 24
DEN11:20 amDenver Intl
19h 20m
1 stop
ISP8:40 amIslip Long Island
$166
Find similar
Frontier
Jan 10
ISP7:56 pmIslip Long Island
29h 03m
1 stop
DEN10:59 pmDenver Intl
Jan 15
DEN4:15 pmDenver Intl
25h 35m
1 stop
ISP7:50 pmIslip Long Island
$183
Find similar
Frontier
Feb 27
ISP3:34 pmIslip Long Island
18h 21m
1 stop
DEN7:55 amDenver Intl
Mar 4
DEN11:59 pmDenver Intl
12h 40m
1 stop
ISP2:39 pmIslip Long Island
$201
Find similar

Southwest flights from Islip, New York to Colorado

Our best Southwest deals on Islip, New York to Colorado flight tickets
Southwest
Feb 19
ISP11:50 amIslip Long Island
10h 45m
2 stops
DEN8:35 pmDenver Intl
Feb 23
DEN12:25 pmDenver Intl
7h 55m
2 stops
ISP10:20 pmIslip Long Island
$403
Find similar
Southwest
Mar 18
ISP12:25 pmIslip Long Island
8h 55m
1 stop
DEN7:20 pmDenver Intl
Mar 23
DEN12:20 pmDenver Intl
9h 35m
2 stops
ISP11:55 pmIslip Long Island
$452
Find similar
Southwest
Mar 18
ISP12:25 pmIslip Long Island
8h 50m
2 stops
DEN7:15 pmDenver Intl
Mar 23
DEN12:20 pmDenver Intl
9h 35m
2 stops
ISP11:55 pmIslip Long Island
$457
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York 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, momondo users made 832,500 searches. Data last updated December 22, 2025.
Use the filters below to find and compare flights from Islip, New York to Colorado that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 1/22

7:43 pm-5:36 pm

1 stop23h 53m

Denver Intl

Sat 1/24

11:20 am-8:40 am

1 stop19h 20m

$166

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sat 1/10

7:56 pm-10:59 pm

1 stop29h 03m

Denver Intl

Thu 1/15

4:15 pm-7:50 pm

1 stop25h 35m

$183

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 2/27

3:34 pm-7:55 am

1 stop18h 21m

Denver Intl

Wed 3/4

11:59 pm-2:39 pm

1 stop12h 40m

$201

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sat 1/17

6:47 pm-8:08 pm

1 stop27h 21m

Denver Intl

Wed 1/21

6:32 pm-6:48 pm

1 stop22h 16m

$202

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 1/8

8:40 pm-5:22 pm

1 stop22h 42m

Denver Intl

Sun 1/11

11:59 pm-7:51 pm

1 stop17h 52m

$218

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Thu 1/8

8:40 pm-10:59 pm

1 stop28h 19m

Denver Intl

Thu 1/15

4:15 pm-7:50 pm

1 stop25h 35m

$221

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Sat 1/10

7:56 pm-8:24 am

1 stop14h 28m

Denver Intl

Wed 1/14

12:20 pm-10:46 pm

1 stop8h 26m

$233

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Fri 1/16

8:45 pm-7:28 am

2 stops36h 43m

Denver Intl

Fri 1/23

9:41 am-8:47 pm

1 stop9h 06m

$236

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Tue 1/13

8:00 am-11:23 am

1 stop29h 23m

Denver Intl

Sat 1/17

6:59 pm-8:55 am

1 stop11h 56m

$253

IslipDenver

ISP - DEN

ISPDEN

Islip Long Island

Wed 1/14

8:00 am-8:20 am

1 stop26h 20m

Denver Intl

Sun 1/18

4:15 pm-7:50 pm

1 stop25h 35m

$268

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Colorado from

How to get the cheapest flight ticket from Islip, New York to Colorado

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Colorado?

The month of September is, on average, the cheapest month to fly to Colorado from Islip, New York, with most prices found around $336. The month of February is another great option to travel to Colorado, with average flight prices from Islip, New York averaging around $361.

What is the cheapest day to depart on your flight to Colorado?

The cheapest day to depart from Islip, New York to Colorado is on a Wednesday when prices can be found for as low as $189. On the other hand, Friday is the most expensive day to depart from Islip, New York because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $417.

What is the cheapest time of day to depart on your flight to Colorado?

The cheapest time of day to fly to Colorado is in the evening when flights can be purchased for as low as $148. In the afternoon is when there is more demand to fly to Colorado, so prices are often more expensive at around $268 per ticket.

Cheap Islip, New York to Colorado flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to Colorado

Fastest flight time

8h 25m

Direct flights

None
The fastest flight from Islip, New York to Colorado takes 8h 25m
There are no direct flights from Islip, New York to Colorado. There are no popular flight routes from Islip, New York to Colorado.
Search flight deals

  • When did momondo last update prices for flights from Islip Long Island Airport to Colorado?

    Prices for flights from Islip Long Island Airport to Colorado are refreshed on a daily basis.

  • How many operators does momondo search for flights from Islip Long Island Airport to Colorado?

  • How old do you have to be to fly from Islip Long Island Airport to Colorado?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Islip Long Island Airport to Colorado.

  • What documentation or ID do you need to fly to Colorado?

    The travel and health documents required for your trip to Colorado can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Colorado. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Islip, New York to Colorado

Compare and see reviews for airlines that fly from Islip, New York to Colorado with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $190Free CancellationRating
5.8
3,079 reviews
Search Frontier flights
SouthwestPriceFrom $388Free CancellationRating
8.0
4,254 reviews
Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Colorado?

Finding the right flight to Colorado from Islip is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Colorado quick and easy, saving you time and money.

Can I find flights from Islip to Colorado with flexible booking policies on momondo?

momondo does allow users to show only those flights to Colorado from Islip which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Islip to Colorado?

momondo provides multiple filters to help you find the best flight to Colorado from Islip. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Islip to Colorado right now. Can momondo alert me if prices change?

Price alerts on flights to Colorado from Islip are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Colorado trip

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