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Cheap flights from Denver to New York from $155

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Denver to New York departing on 8/25. 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 Denver to New York

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:00 am - 8:57 pm
DEN
-
ISP
12h 57m
1 stop
Frontier Logo
9:52 pm - 3:16 pm
ISP
-
DEN
19h 24m
1 stop
$323Frontier
Wed, Jun 24 - Wed, Jul 1
Frontier Logo
8:05 am - 6:51 pm
DEN
-
ISP
8h 46m
1 stop
Frontier Logo
4:13 pm - 11:04 pm
ISP
-
DEN
8h 51m
1 stop
$324Frontier
Mon, Sep 14 - Wed, Sep 16
Frontier Logo
6:00 am - 7:01 pm
DEN
-
ISP
11h 01m
1 stop
Frontier Logo
7:46 pm - 10:29 pm
ISP
-
DEN
28h 43m
1 stop
$342Frontier
Mon, Jul 13 - Wed, Jul 22
Frontier Logo
11:59 pm - 9:33 am
DEN
-
ISP
7h 34m
1 stop
Frontier Logo
4:13 pm - 11:04 pm
ISP
-
DEN
8h 51m
1 stop
$350Frontier
Sat, Sep 12 - Wed, Sep 16
Frontier Logo
11:59 pm - 7:05 pm
DEN
-
ISP
17h 06m
1 stop
Frontier Logo
9:52 pm - 3:16 pm
ISP
-
DEN
19h 24m
1 stop
$362Frontier
Thu, Jun 18 - Sun, Jun 21
Frontier Logo
6:00 am - 7:05 pm
DEN
-
ISP
11h 05m
1 stop
Frontier Logo
9:52 pm - 3:16 pm
ISP
-
DEN
19h 24m
1 stop
$369Frontier
Fri, Jun 12 - Mon, Jun 22
Frontier Logo
9:15 am - 10:05 am
DEN
-
ISP
22h 50m
1 stop
Frontier Logo
4:41 pm - 8:20 am
ISP
-
DEN
17h 39m
1 stop
$370Frontier
Sat, Jun 6 - Tue, Jun 9
Frontier Logo
11:59 pm - 9:33 am
DEN
-
ISP
7h 34m
1 stop
Frontier Logo
4:13 pm - 11:04 pm
ISP
-
DEN
8h 51m
1 stop
$374Frontier
Fri, Sep 11 - Wed, Sep 16
Frontier Logo
6:00 am - 8:57 pm
DEN
-
ISP
12h 57m
1 stop
Frontier Logo
10:48 am - 11:04 pm
ISP
-
DEN
14h 16m
1 stop
$379Frontier
Wed, Jul 1 - Thu, Jul 2
Frontier Logo
6:00 am - 7:05 pm
DEN
-
ISP
11h 05m
1 stop
Frontier Logo
9:52 pm - 3:16 pm
ISP
-
DEN
19h 24m
1 stop
$383Frontier
Fri, Jun 12 - Mon, Jun 22

Southwest flights from Denver to Islip, New York

Our best Southwest deals on Denver to Islip, New York flight tickets
Southwest
Sep 24
DEN5:15 amDenver Intl
5h 20m
1 stop
ISP12:35 pmIslip Long Island
Sep 24
ISP4:05 pmIslip Long Island
5h 50m
1 stop
DEN7:55 pmDenver Intl
$421
Southwest
Sep 24
DEN5:15 amDenver Intl
5h 20m
1 stop
ISP12:35 pmIslip Long Island
Sep 24
ISP4:05 pmIslip Long Island
8h 30m
2 stops
DEN10:35 pmDenver Intl
$426
Southwest
Jul 7
DEN5:00 amDenver Intl
6h 45m
1 stop
ISP1:45 pmIslip Long Island
Jul 14
ISP12:25 pmIslip Long Island
8h 30m
1 stop
DEN6:55 pmDenver Intl
$431

Frontier flights from Denver to Islip, New York

Our best Frontier deals on Denver to Islip, New York flight tickets
Frontier
Jun 24
DEN6:00 amDenver Intl
12h 57m
1 stop
ISP8:57 pmIslip Long Island
Jul 1
ISP9:52 pmIslip Long Island
19h 24m
1 stop
DEN3:16 pmDenver Intl
$323
Frontier
Sep 14
DEN8:05 amDenver Intl
8h 46m
1 stop
ISP6:51 pmIslip Long Island
Sep 16
ISP4:13 pmIslip Long Island
8h 51m
1 stop
DEN11:04 pmDenver Intl
$324
Frontier
Jul 13
DEN6:00 amDenver Intl
11h 01m
1 stop
ISP7:01 pmIslip Long Island
Jul 22
ISP7:46 pmIslip Long Island
28h 43m
1 stop
DEN10:29 pmDenver Intl
$342

momondo Fare Finder

 
Customize your flight search to find flights from Denver to Islip, New York 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 May 27, 2026.
Use the filters below to find and compare flights from Denver to Islip, New York that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverIslip

DEN - ISP

DENISP

Denver Intl

Wed 6/24

6:00 am-8:57 pm

1 stop12h 57m

Islip Long Island

Wed 7/1

9:52 pm-3:16 pm

1 stop19h 24m

$323

DenverIslip

DEN - ISP

DENISP

Denver Intl

Mon 9/14

8:05 am-6:51 pm

1 stop8h 46m

Islip Long Island

Wed 9/16

4:13 pm-11:04 pm

1 stop8h 51m

$324

DenverIslip

DEN - ISP

DENISP

Denver Intl

Mon 7/13

6:00 am-7:01 pm

1 stop11h 01m

Islip Long Island

Wed 7/22

7:46 pm-10:29 pm

1 stop28h 43m

$342
Quickest round-trip

DenverIslip

DEN - ISP

DENISP

Denver Intl

Sat 9/12

11:59 pm-9:33 am

1 stop7h 34m

Islip Long Island

Wed 9/16

4:13 pm-11:04 pm

1 stop8h 51m

$350

DenverIslip

DEN - ISP

DENISP

Denver Intl

Thu 6/18

11:59 pm-7:05 pm

1 stop17h 06m

Islip Long Island

Sun 6/21

9:52 pm-3:16 pm

1 stop19h 24m

$362

DenverIslip

DEN - ISP

DENISP

Denver Intl

Fri 6/12

6:00 am-7:05 pm

1 stop11h 05m

Islip Long Island

Mon 6/22

9:52 pm-3:16 pm

1 stop19h 24m

$369

DenverIslip

DEN - ISP

DENISP

Denver Intl

Sat 6/6

9:15 am-10:05 am

1 stop22h 50m

Islip Long Island

Tue 6/9

4:41 pm-8:20 am

1 stop17h 39m

$370

DenverIslip

DEN - ISP

DENISP

Denver Intl

Fri 9/11

11:59 pm-9:33 am

1 stop7h 34m

Islip Long Island

Wed 9/16

4:13 pm-11:04 pm

1 stop8h 51m

$374

DenverIslip

DEN - ISP

DENISP

Denver Intl

Wed 7/1

6:00 am-8:57 pm

1 stop12h 57m

Islip Long Island

Thu 7/2

10:48 am-11:04 pm

1 stop14h 16m

$379

DenverIslip

DEN - ISP

DENISP

Denver Intl

Fri 6/12

6:00 am-7:05 pm

1 stop11h 05m

Islip Long Island

Mon 6/22

9:52 pm-3:16 pm

1 stop19h 24m

$383

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 New York from

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

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 airline that flies from Denver Intl to Islip Long Island?

Frontier is the most popular carrier operating from Denver Intl to Islip Long Island

What airlines fly to Islip, New York?

United Airlines, Delta and Frontier are the top three most popular airlines that fly to Islip, New York from Denver according to our data. United Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Islip, New York. Keep in mind that there are 6 different airlines that fly to Islip, New York on a routine basis, so you have a few additional options to choose from.

When to book flights from Denver to Islip, New York

Are you open to changing your travel dates? Check out the ideal times to fly from Denver to Islip, New York according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Denver to Islip, New York (DEN to ISP) flight deals and tips

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

Fastest flight time

7h 34m

Direct flights

None
The fastest flight from Denver to Islip, New York takes 7h 34m
There are no direct flights from Denver to Islip, New York. There are no popular flight routes from Denver to Islip, New York.
Search flight deals

Frequently asked questions about flying from Denver to Islip, New York

  • How far is Denver Intl to Islip Long Island by plane?

    A flight from Denver Intl to Islip Long Island will travel around 1667.0 mi. In terms of flight time, this usually takes a little over 7h 34m.

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

    Prices for flights from Denver Intl Airport to Islip Long Island Airport were last updated today.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Islip Long Island Airport.

  • What documentation or ID do you need to fly to Islip Long Island Airport?

    The required travel and health documents for your Islip Long Island Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Islip Long Island Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Denver to Islip, New York?

Best airlines flying from Denver to Islip, New York

Compare and see reviews for airlines that fly from Denver to Islip, New York with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $375Free CancellationRating
7.9
4,265 reviews
Search Southwest flights

Traveling to a place near New York?

Book flights to New York if you plan to visit one of these locations
Montauk
Riverhead
Sag Harbor
Southampton
Amagansett

Why use momondo?

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

Finding the right flight to Islip from Denver 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 Islip quick and easy, saving you time and money.

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

All flight searches from Denver to Islip on momondo can be filtered to show those which offer flexible booking policies.

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

Once all potential Denver to Islip flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of Denver to Islip flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Islip, New York trip

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