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Islip

$458+ Cheap flights from Boise to Islip (BOI - ISP)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ISP
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap 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 September 11, 2025.

Round-trip from

$795
(Cheapflightsfares)

One-way from

$458
(Cheapflightsfares)

Popular in

December

Cheapest in

April

Average price

$397
From Boise Air Term. Gowen Fld to Islip Long Island
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One-way flight from Boise Air Term. Gowen Fld to Islip Long Island
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Highest demand for flights based on searches. 18% potential increase in price ($90 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Boise to Islip

Cheapest flights from Boise to Islip
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 September 11, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/108:50 pmBOI - ISP
2 stops12h 08mMultiple Airlines
Mon 11/172:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/9$795
This Cheapflightsfares deal was found by Cheapflights users on 9/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/146:28 amBOI - ISP
2 stops11h 33mMultiple Airlines
Tue 11/182:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/11$845
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/108:50 pmBOI - ISP
2 stops12h 08mMultiple Airlines
Fri 11/142:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/10$913
This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/316:28 amBOI - ISP
2 stops11h 33mMultiple Airlines
Mon 11/32:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/9$918
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/116:28 amBOI - ISP
2 stops11h 33mMultiple Airlines
Tue 11/182:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/10$953
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/108:50 pmBOI - ISP
2 stops12h 08mMultiple Airlines
Sat 11/152:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/10$959
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/78:50 pmBOI - ISP
2 stops12h 08mMultiple Airlines
Sun 11/92:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/10$1,021
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/126:28 amBOI - ISP
2 stops11h 33mMultiple Airlines
Fri 11/142:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/10$1,039
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/296:28 amBOI - ISP
2 stops11h 33mMultiple Airlines
Wed 11/52:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/10$1,079
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/126:28 amBOI - ISP
2 stops11h 33mMultiple Airlines
Sat 11/152:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/10$1,084
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/206:30 amBOI - ISP
2 stops11h 31mMultiple Airlines
Thu 10/232:19 pmISP - BOI
2 stops11h 38mMultiple Airlines
Deal found 9/10$1,087
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/116:28 amBOI - ISP
2 stops11h 33mMultiple Airlines
Fri 11/142:19 pmISP - BOI
2 stops11h 40mMultiple Airlines
Deal found 9/10$1,097

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 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Boise to Islip that are best for you.

Fly from

Boise

Fly to

Islip

Route

Depart

Return

Price

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Mon 11/10

8:50 pm-10:58 am

2 stops12h 08m

Islip Long Island

Mon 11/17

2:19 pm-11:59 pm

2 stops11h 40m

$795

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Fri 11/14

6:28 am-8:01 pm

2 stops11h 33m

Islip Long Island

Tue 11/18

2:19 pm-11:59 pm

2 stops11h 40m

$845

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Mon 11/10

8:50 pm-10:58 am

2 stops12h 08m

Islip Long Island

Fri 11/14

2:19 pm-11:59 pm

2 stops11h 40m

$913

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Fri 10/31

6:28 am-8:01 pm

2 stops11h 33m

Islip Long Island

Mon 11/3

2:19 pm-11:59 pm

2 stops11h 40m

$918

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Tue 11/11

6:28 am-8:01 pm

2 stops11h 33m

Islip Long Island

Tue 11/18

2:19 pm-11:59 pm

2 stops11h 40m

$953

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Mon 11/10

8:50 pm-10:58 am

2 stops12h 08m

Islip Long Island

Sat 11/15

2:19 pm-11:59 pm

2 stops11h 40m

$959

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Wed 10/29

6:28 am-8:01 pm

2 stops11h 33m

Islip Long Island

Wed 11/5

2:19 pm-11:59 pm

2 stops11h 40m

$1,079

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Wed 10/29

6:28 am-8:01 pm

2 stops11h 33m

Islip Long Island

Thu 11/6

2:19 pm-11:59 pm

2 stops11h 40m

$1,079

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Mon 10/20

6:30 am-8:01 pm

2 stops11h 31m

Islip Long Island

Thu 10/23

2:19 pm-11:57 pm

2 stops11h 38m

$1,087

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

Tue 11/11

6:28 am-8:01 pm

2 stops11h 33m

Islip Long Island

Sat 11/15

2:19 pm-11:59 pm

2 stops11h 40m

$1,142

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 16 results
1
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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.
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.

Cheapflights Insights

Everything you need to know about your flight from Boise to Islip

What is the cheapest month to book a flight from Boise to Islip?

Currently, January is the cheapest month in which you can book a flight from Boise to Islip (average of $108). Flying from Boise to Islip in November is currently the most expensive (average of $213). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Boise to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find deals for flights from Boise to Islip that include hotel bookings?

    Yes. In addition to deals on Boise to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boise to Islip?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boise to Islip.

  • Can I find deals for business class flights from Boise to Islip?

    Yes. Cheapflights offers flight deals from Boise to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boise to Islip?

    Currently, January is the cheapest month in which you can book a flight from Boise to Islip (average of $108). Flying from Boise to Islip in November is currently the most expensive (average of $213). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
Southampton

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