$148 Cheap Flights from Islip (ISP) to Las Vegas (LAS)

View $148 flight on Mon, Oct 27, 2025Opens in a new window

Popular airlines from MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS)

Cheap Flights from Islip to Las Vegas (ISP-LAS)

Prices were available within the past 7 days and start at $148 for one-way flights and $275 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Jul 24 - Tue, Jul 29
ISP
Islip
LAS
Las Vegas
$275 Roundtrip, found 3 days ago
$275
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Thu, Jul 24 from Islip to Las Vegas, returning Tue, Jul 29, priced at $275 found 3 days ago
JetBlue Airways
Tue, Nov 11 - Fri, Nov 14
ISP
Islip
LAS
Las Vegas
$275 Roundtrip, found 1 day ago
$275
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Tue, Nov 11 from Islip to Las Vegas, returning Fri, Nov 14, priced at $275 found 1 day ago
Frontier Airlines
Tue, Aug 5 - Thu, Aug 14
ISP
Islip
LAS
Las Vegas
$285 Roundtrip, found 3 days ago
$285
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Tue, Aug 5 from Islip to Las Vegas, returning Thu, Aug 14, priced at $285 found 3 days ago
Frontier Airlines
Mon, Aug 4 - Thu, Aug 14
ISP
Islip
LAS
Las Vegas
$294 Roundtrip, found 3 days ago
$294
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Mon, Aug 4 from Islip to Las Vegas, returning Thu, Aug 14, priced at $294 found 3 days ago
JetBlue Airways
Tue, Sep 2 - Sun, Sep 14
ISP
Islip
LAS
Las Vegas
$295 Roundtrip, found 10 hours ago
$295
Roundtrip
found 10 hours ago
Select JetBlue Airways flight, departing Tue, Sep 2 from Islip to Las Vegas, returning Sun, Sep 14, priced at $295 found 10 hours ago
Frontier Airlines
Fri, Jul 11 - Sun, Jul 13
ISP
Islip
LAS
Las Vegas
$296 Roundtrip, found 5 days ago
$296
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Fri, Jul 11 from Islip to Las Vegas, returning Sun, Jul 13, priced at $296 found 5 days ago
Frontier Airlines
Sat, Aug 2 - Thu, Aug 14
ISP
Islip
LAS
Las Vegas
$298 Roundtrip, found 3 days ago
$298
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sat, Aug 2 from Islip to Las Vegas, returning Thu, Aug 14, priced at $298 found 3 days ago
JetBlue Airways
Wed, Sep 10 - Fri, Sep 19
ISP
Islip
LAS
Las Vegas
$300 Roundtrip, found 4 days ago
$300
Roundtrip
found 4 days ago
Select JetBlue Airways flight, departing Wed, Sep 10 from Islip to Las Vegas, returning Fri, Sep 19, priced at $300 found 4 days ago
Frontier Airlines
Wed, Jul 23 - Tue, Jul 29
ISP
Islip
LAS
Las Vegas
$301 Roundtrip, found 3 days ago
$301
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Wed, Jul 23 from Islip to Las Vegas, returning Tue, Jul 29, priced at $301 found 3 days ago
Southwest Airlines
Mon, Oct 20 - Fri, Oct 24
ISP
Islip
LAS
Las Vegas
$328 Roundtrip, found 1 hour ago
$328
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Mon, Oct 20 from Islip to Las Vegas, returning Fri, Oct 24, priced at $328 found 1 hour ago

Find the cheapest month to fly from Islip (ISP) to Las Vegas (LAS)

January is typically the cheapest month to fly

From $158 - $700 per traveler.

Graph displaying average flight prices per month

Alternative airports near Las Vegas

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

Select flight to McCarran Intl. LAS. Cheapest and Closest option available. Average driving time to city center is 6 minutes. Flights from $326
LAS
McCarran Intl.
CheapestClosest
Average driving time to city center6 min
Flights from $326
Flights from Islip (ISP) to Las Vegas (LAS)
Origin airport
MacArthur
Destination airport
Harry Reid Intl.
Airlines serving
Frontier Airlines, JetBlue Airways, Southwest Airlines
Roundtrip price
$274
Distance
2276 mi

Islip to Las Vegas Flights

The cheapest times to fly from Islip to Las Vegas

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 Islip to Las Vegas are during the month of July. You can find some of the cheapest flights from Islip to Las Vegas with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Islip to Las Vegas

Sunday is one of the best days to book for cheap flights from Islip to Las Vegas: 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 Islip to Las Vegas

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 Islip to Las Vegas in 2025. You can also book with separate airlines for your outbound and return journeys, from $148 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 Islip to Las Vegas 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 Islip to Las Vegas 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 MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS) cost?
Discover the latest flight deals from ISP to LAS by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from ISP to LAS?
The cheapest flights from ISP to LAS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS)?
Although Islip, NY (ISP-MacArthur) doesn't offer any direct flights to Harry Reid Intl. Airport (LAS), other airports have nonstop routes. Flying from John F. Kennedy Intl. Airport (JFK) will get you to Las Vegas without any detours.
What is the cheapest airline that flies from ISP to LAS?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from ISP to LAS. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS)?
Nonstop flights from MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from ISP to LAS?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary based on a range of factors, including 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 MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS)?
Book a flight from MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS) that leaves before 3 PM to reduce the risk of cancellations and delays. Later departures have a 22% higher chance of being canceled, on average.**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.
Is it cheaper to buy a plane ticket from MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS) last-minute?
Last-minute bookings from ISP to LAS are typically more expensive. To lock in the lowest rates, start looking for flights as soon as possible. That said, if you can play around with your travel dates, you may find a cheap fare just before your departure.
Is it cheaper to book an ISP to LAS flight and hotel package?
You'll generally save money by booking an ISP to LAS flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. Once you've chosen your preferred accommodations and flights, consider adding extras such as car rentals, activities and tours.
Can I cancel or change the date of my flight from MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS)?
You can usually cancel or reschedule your ISP to LAS flight. However, if it's been more than 24 hours since booking, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.