$65 Cheap Flights from Denver (DEN) to Islip (ISP)

View $65 flight on Sat, Dec 6, 2025Opens in a new window

Popular airlines from Denver Intl. Airport (DEN) to MacArthur Airport (ISP)

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Denver to Islip (DEN-ISP)

Prices were available within the past 7 days and start at $65 for one-way flights and $130 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Dec 10 - Sat, Dec 13
DEN
Denver
ISP
Islip
$130 Roundtrip, found 4 hours ago
$130
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Wed, Dec 10 from Denver to Islip, returning Sat, Dec 13, priced at $130 found 4 hours ago
Frontier Airlines
Fri, Dec 12 - Mon, Dec 15
DEN
Denver
ISP
Islip
$134 Roundtrip, found 5 days ago
$134
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Fri, Dec 12 from Denver to Islip, returning Mon, Dec 15, priced at $134 found 5 days ago
Frontier Airlines
Tue, Dec 2 - Mon, Dec 8
DEN
Denver
ISP
Islip
$137 Roundtrip, found 1 day ago
$137
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Dec 2 from Denver to Islip, returning Mon, Dec 8, priced at $137 found 1 day ago
Frontier Airlines
Wed, Dec 10 - Sat, Dec 13
DEN
Denver
ISP
Islip
$138 Roundtrip, found 4 hours ago
$138
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Wed, Dec 10 from Denver to Islip, returning Sat, Dec 13, priced at $138 found 4 hours ago
Frontier Airlines
Wed, Dec 10 - Sat, Dec 13
DEN
Denver
ISP
Islip
$140 Roundtrip, found 4 hours ago
$140
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Wed, Dec 10 from Denver to Islip, returning Sat, Dec 13, priced at $140 found 4 hours ago
Frontier Airlines
Fri, Dec 12 - Mon, Dec 15
DEN
Denver
ISP
Islip
$142 Roundtrip, found 5 days ago
$142
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Fri, Dec 12 from Denver to Islip, returning Mon, Dec 15, priced at $142 found 5 days ago
Frontier Airlines
Sun, Dec 7 - Wed, Dec 10
DEN
Denver
ISP
Islip
$144 Roundtrip, found 3 days ago
$144
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sun, Dec 7 from Denver to Islip, returning Wed, Dec 10, priced at $144 found 3 days ago
Frontier Airlines
Tue, Dec 2 - Mon, Dec 8
DEN
Denver
ISP
Islip
$145 Roundtrip, found 1 day ago
$145
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Dec 2 from Denver to Islip, returning Mon, Dec 8, priced at $145 found 1 day ago
Southwest Airlines
Wed, Dec 10 - Tue, Dec 16
DEN
Denver
ISP
Islip
$367 Roundtrip, found 3 days ago
$367
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Wed, Dec 10 from Denver to Islip, returning Tue, Dec 16, priced at $367 found 3 days ago
JetBlue Airways
Tue, Mar 24 - Thu, Mar 26
DEN
Denver
ISP
Islip
$515 Roundtrip, found 6 hours ago
$515
Roundtrip
found 6 hours ago
Select JetBlue Airways flight, departing Tue, Mar 24 from Denver to Islip, returning Thu, Mar 26, priced at $515 found 6 hours ago

Find the cheapest month to fly from Denver (DEN) to Islip (ISP)

January is typically the cheapest month to fly

From $118 - $589 per traveler.

Alternative airports near Islip

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to MacArthur ISP. Cheapest and Closest option available. Average driving time to city center is 14 minutes. Flights from $147
ISP
MacArthur
CheapestClosest
Average driving time to city center14 min
Flights from $147
Flights from Denver (DEN) to Islip (ISP)
Origin airport
Denver Intl.
Destination airport
MacArthur
Airlines serving
Frontier Airlines, JetBlue Airways, Southwest Airlines
Roundtrip price
$130
Distance
1655 mi

Denver to Islip Flights

The cheapest times to fly from Denver to Islip

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Denver to Islip are during the month of December. You can find some of the cheapest flights from Denver to Islip with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Denver to Islip

Sunday is one of the best days to book for cheap flights from Denver to Islip: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Denver to Islip

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Denver to Islip in 2025. You can also book with separate airlines for your outbound and return journeys, from $65 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Denver to Islip flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Denver to Islip airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Denver Intl. Airport (DEN) to MacArthur Airport (ISP) cost?
Secure a cheap one-way flight from $65 or cheap return flight from $130 from Denver Intl. Airport (DEN) to MacArthur Airport (ISP) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Denver Intl. Airport (DEN) to MacArthur Airport (ISP)?
Planning your getaway for December can help you save, as it's the cheapest month for flights between DEN and ISP. You'll typically find the lowest fares during the off-season.
What is the cheapest airline that flies from Denver Intl. Airport (DEN) to MacArthur Airport (ISP)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll take you from DEN to ISP. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
How many flights per day from Denver Intl. Airport (DEN) to MacArthur Airport (ISP)?
Direct flights from Denver Intl. Airport (DEN) to MacArthur Airport (ISP) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel details and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from DEN to ISP?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can vary based on various factors, such as the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Denver Intl. Airport (DEN) to MacArthur Airport (ISP)?
To avoid possible delays on the Denver Intl. Airport (DEN) to MacArthur Airport (ISP) route, travel before 3 PM. Departures after this hour have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Islip from Denver Intl. Airport (DEN)?
You'll touch down at LaGuardia Airport (LGA) or John F. Kennedy Intl. Airport (JFK) when traveling to Islip on a direct flight from Denver Intl. Airport (DEN).
Is it cheaper to buy a plane ticket from Denver Intl. Airport (DEN) to MacArthur Airport (ISP) last-minute?
Last-minute bookings from DEN to ISP are usually more expensive. To lock in the best prices, start looking for flights early. That being said, if you're flexible with your travel plans, you may land a cheap ticket right before your journey.
Is it cheaper to book a DEN to ISP flight and hotel package?
You'll typically save money by securing a DEN to ISP flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one convenient place. After choosing your preferred flights and accommodations, consider adding extras including tours, activities and car rentals.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to MacArthur Airport (ISP)?
You can usually reschedule or cancel your DEN to ISP flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find further details on our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.