$324+ 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 11/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ISP
Nov 23 — Nov 301
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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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Boise to Islip
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Best
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One-way
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 24, 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 24, 2026.
This Southwest deal was found by Cheapflights users on 10/20. 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 11/46:20 am -
2 stops13h 25m
Sun 11/85:35 am -
2 stops13h 25m
Deal found 10/20![Southwest logo]()
$707
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 24, 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 24, 2026.
This Southwest deal was found by Cheapflights users on 10/23. 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.
Thu 1/288:20 am -
2 stops11h 10m
Mon 2/111:20 am -
2 stops12h 10m
Deal found 10/23![Southwest logo]()
$375
This Southwest deal was found by Cheapflights users on 10/20. 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 11/46:20 am -
2 stops13h 25m
Sun 11/85:35 am -
2 stops13h 25m
Deal found 10/20![Southwest logo]()
$707
Last-minute flights from Boise to IslipDiscover last-minute flight deals from Boise to Islip. Data last updated October 24, 2026 and is based on user searches.
Discover last-minute flight deals from Boise to Islip. Data last updated October 24, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 10/20. 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 11/46:20 am -
2 stops13h 25m
Sun 11/85:35 am -
2 stops13h 25m
Deal found 10/20![Southwest logo]()
$707
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 24, 2026.
Search for one-way flight options from Boise to Islip. Find affordable one-way fares based on user searches. Data last updated October 24, 2026.
This Southwest deal was found by Cheapflights users on 10/20. 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 11/47:20 am -
2 stops12h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Southwest logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:37 am -
3 stops50h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Multiple Airlines logo]()
$590
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 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $375 (Southwest) |
One-way from | $324 (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 24, 2026.
Use the filters below to find and compare flights from Boise to Islip that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
BoiseIslip
BOI Boise Air Term. Gowen Fld - ISP Islip Long Island
BOIISP
Boise Air Term. Gowen Fld
Wed 11/4
7:20 am-9:45 pm
2 stops12h 25m
Islip Long Island
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$324
BoiseIslip
BOI Boise Air Term. Gowen Fld - ISP Islip Long Island
BOIISP
Boise Air Term. Gowen Fld
Thu 1/28
8:20 am-9:30 pm
2 stops11h 10m
Islip Long Island
Mon 2/1
11:20 am-9:30 pm
2 stops12h 10m
$375
BoiseIslip
BOI Boise Air Term. Gowen Fld - ISP Islip Long Island
BOIISP
Boise Air Term. Gowen Fld
Wed 11/4
6:37 am-11:15 am
3 stops50h 38m
Islip Long Island
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$590
BoiseIslip
BOI Boise Air Term. Gowen Fld - ISP Islip Long Island
BOIISP
Boise Air Term. Gowen Fld
Wed 11/4
6:20 am-9:45 pm
2 stops13h 25m
Islip Long Island
Sun 11/8
5:35 am-5:00 pm
2 stops13h 25m
$707
Sorted by cheapest first
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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