$139 Cheap Flights from Islip (ISP) to Las Vegas (LAS)

View $139 flight on Sat, May 24, 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key
Find available prices by choosing your travel dates.

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

Prices were available within the past 7 days and start at $139 for one-way flights and $250 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, May 17 - Wed, May 21
ISP
Islip
LAS
Las Vegas
$250 Roundtrip, found 2 hours ago
$250
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sat, May 17 from Islip to Las Vegas, returning Wed, May 21, priced at $250 found 2 hours ago
Frontier Airlines
Tue, May 20 - Wed, May 28
ISP
Islip
LAS
Las Vegas
$259 Roundtrip, found 1 day ago
$259
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, May 20 from Islip to Las Vegas, returning Wed, May 28, priced at $259 found 1 day ago
Frontier Airlines
Mon, May 12 - Wed, May 21
ISP
Islip
LAS
Las Vegas
$260 Roundtrip, found 2 hours ago
$260
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Mon, May 12 from Islip to Las Vegas, returning Wed, May 21, priced at $260 found 2 hours ago
Frontier Airlines
Sat, May 3 - Tue, May 6
ISP
Islip
LAS
Las Vegas
$266 Roundtrip, found 1 hour ago
$266
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sat, May 3 from Islip to Las Vegas, returning Tue, May 6, priced at $266 found 1 hour ago
Frontier Airlines
Sat, May 17 - Thu, May 22
ISP
Islip
LAS
Las Vegas
$269 Roundtrip, found 2 hours ago
$269
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sat, May 17 from Islip to Las Vegas, returning Thu, May 22, priced at $269 found 2 hours ago
Frontier Airlines
Mon, May 5 - Fri, May 9
ISP
Islip
LAS
Las Vegas
$270 Roundtrip, found 4 days ago
$270
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Mon, May 5 from Islip to Las Vegas, returning Fri, May 9, priced at $270 found 4 days ago
JetBlue Airways
Fri, Jun 27 - Wed, Jul 9
ISP
Islip
LAS
Las Vegas
$275 Roundtrip, found 11 hours ago
$275
Roundtrip
found 11 hours ago
Select JetBlue Airways flight, departing Fri, Jun 27 from Islip to Las Vegas, returning Wed, Jul 9, priced at $275 found 11 hours ago
Frontier Airlines
Sun, May 4 - Tue, May 6
ISP
Islip
LAS
Las Vegas
$276 Roundtrip, found 1 hour ago
$276
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sun, May 4 from Islip to Las Vegas, returning Tue, May 6, priced at $276 found 1 hour ago
Frontier Airlines
Mon, May 12 - Thu, May 22
ISP
Islip
LAS
Las Vegas
$279 Roundtrip, found 2 hours ago
$279
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Mon, May 12 from Islip to Las Vegas, returning Thu, May 22, priced at $279 found 2 hours ago
Southwest Airlines
Tue, Jun 3 - Tue, Jun 10
ISP
Islip
LAS
Las Vegas
$309 Roundtrip, found 4 days ago
$309
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Tue, Jun 3 from Islip to Las Vegas, returning Tue, Jun 10, priced at $309 found 4 days ago

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.
*Available to One Key members.