$139 Cheap Frontier Airlines flights Islip (ISP) to Las Vegas (LAS)

Apply the “Price (lowest to highest)” filter on Expedia to look for cheap Frontier Airlines round-trip flights from $250 from ISP to LAS. Affordable one-way options from $139 are also on offer.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines flights to Las Vegas are usually more affordable in the low-season months of January and June. Whether you’re after a round-trip or one-way ticket, you could score a better deal then.

Search for affordable Frontier Airlines flights from MacArthur Airport (ISP) to Harry Reid Intl. Airport (LAS) one to three months ahead of your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and journey, the best day of the week to book a domestic flight is usually Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Select our “Nonstop” filter when searching for direct Frontier Airlines flights from ISP to LAS. It’s also a good way to compare other carriers offering the same nonstop route.

Search Frontier Airlines’s earliest flights from ISP to LAS by using the “Morning” and “Early Morning” filters. Not only will you get to your destination sooner, early departures also experience 20% fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Frontier Airlines flights from MacArthur Airport (ISP) to Las Vegas arrive at Harry Reid Intl. Airport (LAS). This is the main entry point to this city.

Travel from ISP to LAS with Frontier Airlines and you’ll enjoy a range of benefits including a rewarding loyalty program. When booking through Expedia as a Frontier Miles and One Key™ member, you can also earn OneKeyCash™* to use on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Typically, you can reschedule or cancel your flight, although there may be additional fees if your booking was made over 24 hours ago. Prefer to keep your options open? Use Expedia’s “Changes included” and “No cancel fee” filters to find flights that won’t charge you extra if you need to alter your plans. To modify your booking, head to “Trips,” select your flight and click on “Manage Booking” for more details.