$511+ Cheap flights from Boise to Islip, NY (BOI - ISP)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ISP
Nov 11 — Nov 181
Round-trip
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Boise to IslipExplore the most affordable flight options available from Boise to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 12, 2026.
Explore the most affordable flight options available from Boise to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 12, 2026.
This Southwest deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3012:45 pm -
2 stops9h 00m
Fri 1/811:20 am -
2 stops12h 50m
Deal found 10/9![Southwest logo]()
$511
Best flights from Boise to IslipDiscover carefully curated flight deals from Boise to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 12, 2026.
Discover carefully curated flight deals from Boise to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 12, 2026.
This Southwest deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3012:45 pm -
2 stops9h 00m
Fri 1/811:20 am -
2 stops12h 50m
Deal found 10/9![Southwest logo]()
$511
One-way flights from Boise to IslipSearch for one-way flight options from Boise to Islip. Find affordable one-way fares based on user searches. Data last updated October 12, 2026.
Search for one-way flight options from Boise to Islip. Find affordable one-way fares based on user searches. Data last updated October 12, 2026.
This Frontier deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/217:55 pm -
2 stops17h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/8![Frontier logo]()
$654
Find flight deals from Boise to Islip
Discover tips and strategies to find the most affordable flight options for your journey from Boise (BOI) to Islip (ISP). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $511 (Southwest) |
Popular in | June |
Cheapest in | November |
Average price | $393 |
Cheapflights Fare Finder
Customize your flight search to find flights from Boise to Islip that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 12, 2026.
Use the filters below to find and compare flights from Boise to Islip that are best for you.
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Fly to
Route
Depart
Return
Cheapest round-trip
BoiseIslip
BOI Boise Air Term. Gowen Fld - ISP Islip Long Island
BOIISP
Boise Air Term. Gowen Fld
Wed 12/30
12:45 pm-11:45 pm
2 stops9h 00m
Islip Long Island
Fri 1/8
11:20 am-10:10 pm
2 stops12h 50m
$511
Quickest round-trip
BoiseIslip
BOI Boise Air Term. Gowen Fld - ISP Islip Long Island
BOIISP
Boise Air Term. Gowen Fld
Sat 11/21
7:55 pm-3:45 pm
2 stops17h 50m
Islip Long Island
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$654
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Best time to book a flight from Boise to Islip
Have a flexible travel schedule? Discover the best time to fly to Islip from Boise with our price prediction graph.
BOI-ISP
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Related info for your journey
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Traveling to a place near Islip?
Book flights to Islip if you plan to visit one of these locationsRiverhead
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