$135 Cheap Flights from Islip (ISP) to Boise (BOI)

View $135 flight on Wed, Jan 14, 2026Opens in a new window

Popular airlines from MacArthur Airport (ISP) to Boise Airport (BOI)

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Cheap Flights from Islip to Boise (ISP-BOI)

Prices were available within the past 7 days and start at $135 for one-way flights and $557 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$557 Roundtrip, found 5 days ago
$557
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $557 found 5 days ago
Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$562 Roundtrip, found 5 days ago
$562
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $562 found 5 days ago
Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$571 Roundtrip, found 5 days ago
$571
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $571 found 5 days ago
Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$576 Roundtrip, found 5 days ago
$576
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $576 found 5 days ago
Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$583 Roundtrip, found 5 days ago
$583
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $583 found 5 days ago
Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$584 Roundtrip, found 5 days ago
$584
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $584 found 5 days ago
Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$585 Roundtrip, found 5 days ago
$585
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $585 found 5 days ago
Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$588 Roundtrip, found 5 days ago
$588
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $588 found 5 days ago
Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$589 Roundtrip, found 5 days ago
$589
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $589 found 5 days ago
Southwest Airlines
Wed, Sep 24 - Wed, Oct 1
ISP
Islip
BOI
Boise
$590 Roundtrip, found 5 days ago
$590
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Sep 24 from Islip to Boise, returning Wed, Oct 1, priced at $590 found 5 days ago

Frequently asked questions

How much does a flight from MacArthur Airport (ISP) to Boise Airport (BOI) cost?
Secure a cheap one-way flight from $135 or cheap return flight from $557 from MacArthur Airport (ISP) to Boise Airport (BOI) 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 MacArthur Airport (ISP) to Boise Airport (BOI)?
Traveling in September can help you save, as it's the cheapest month for flights between ISP and BOI. You'll usually find the lowest fares during off-peak months.
What is the cheapest airline that flies from MacArthur Airport (ISP) to Boise Airport (BOI)?
To find the cheapest airline flying from ISP to BOI, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from MacArthur Airport (ISP) to Boise Airport (BOI)?
There are no daily nonstop flights available from MacArthur Airport (ISP) to Boise Airport (BOI). But you can book flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be cruising above the clouds before you know it.
What day of the week has the most flights from ISP to BOI?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during public holidays or peak travel times.*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 Boise Airport (BOI)?
To land at Boise Airport (BOI) without delays, choose a flight that leaves from MacArthur Airport (ISP) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Boise Airport (BOI) last-minute?
Last-minute bookings from ISP to BOI are generally more expensive. To lock in the lowest prices, start searching for flights ahead of time. That said, if you're flexible with your travel dates, it's possible to score a cheap fare right before you leave.
Is it cheaper to book an ISP to BOI flight and hotel package?
You'll generally save money by securing an ISP to BOI flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one convenient place. Once you've chosen your preferred accommodations and flights, consider other add-ons like car rentals, activities and tours.
Can I cancel or change the date of my flight from MacArthur Airport (ISP) to Boise Airport (BOI)?
In most instances, you're able to reschedule or cancel your ISP to BOI flight. However, there may be additional fees, especially if you booked more than 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you want further details, visit our Customer Service portal.

Travel information

Travel information

Origin airport
MacArthur
Destination airport
Boise
Roundtrip price
$557
Distance
2191 mi

Book with confidence

Book with confidence

Islip to Boise Flights

The cheapest times to fly from Islip to Boise

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

 

The best time to book a flight from Islip to Boise

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

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 Boise in 2025. You can also book with separate airlines for your outbound and return journeys, from $135 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 Boise 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 Boise 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.

 

Islip to Boise Flights

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*Available to One Key members.