In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

How far in advance should I book a flight from Boise to Islip, New York?

Find a great deal and save up to 110% by booking at least 38 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Boise to Islip, New York within the next two weeks, with the cheapest ticket starting at $321.

What is the cheapest month to fly from Boise to Islip, New York?

Our data shows that April tends to be the cheapest month to fly to Islip, New York from Boise. Users have commonly found prices around $415 for the month, but tickets can be as low as $249. Due to multiple factors, prepare for potentially higher prices in December.

What is the cheapest time of day to fly from BOI to ISP?

When flying from Boise to Islip, New York, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

$255+ Flights from Boise to Islip, NY

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Cheap flight deals from Boise to Islip

Popular in	December
Cheapest in	April
Average price	$416

Highest demand for flights based on searches. 16% potential increase in price ($81 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in July 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 julio 29, 2025.

vie. 8/18:25 pmBOI - ISP

2 stops14h 59mMultiple Airlines

lun. 8/44:33 pmISP - BOI

2 stops22h 16mMultiple Airlines

Deal found 7/27

$1,536

Last-minute flights from Boise to Islip
Discover last-minute flight deals from Boise to Islip. Data last updated julio 29, 2025 and is based on user searches.

vie. 8/18:25 pmBOI - ISP

2 stops14h 59mMultiple Airlines

lun. 8/44:33 pmISP - BOI

2 stops22h 16mMultiple Airlines

Deal found 7/27

$1,536

One-way flights from Boise to Islip
Search for one-way flight options from Boise to Islip. Find affordable one-way fares based on user searches. Data last updated julio 29, 2025.

jue. 9/256:15 amBOI - ISP

2 stops14h 40mSouthwest

Deal found 7/27

$255

jue. 9/252:16 pmBOI - ISP

3 stops27h 51mMultiple Airlines

Deal found 7/27

$360

Fly from

Fly to

Route

Depart

Return

Price

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

jue. 9/25

6:15 am-10:55 pm

2 stops14h 40m

$255

BoiseIslip

BOI - ISP

BOIISP

Boise Air Term. Gowen Fld

jue. 9/25

2:16 pm-8:07 pm

3 stops27h 51m

$360

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

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, New York?

Currently, January is the cheapest month in which you can book a flight from Boise to Islip, New York (average of $108). Flying from Boise to Islip, New York 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.

Reviews of airlines servicing Islip

See what other customers who have flown with Southwest from Boise to Islip have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,238 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Southwest

8.0

Very good

4,238 reviews

Southwest

8.0

Very good

4,238 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

Related info for your journey

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, New York?
Currently, January is the cheapest month in which you can book a flight from Boise to Islip, New York (average of $108). Flying from Boise to Islip, New York 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.

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Complete your trip

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$255+ Cheap flights from Boise to Islip, NY (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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Boise to Islip with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Boise to Islip

Popular in

Cheapest in

Average price

Find flight deals from Boise to Islip

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 julio 29, 2025.

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 julio 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boise to Islip that are best for you.

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.

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, New York?

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Islip. Reviews last updated julio 29, 2025.

See what other customers who have flown with Southwest from Boise to Islip have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

How can I find direct flights from Boise to Islip?

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

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

Traveling to a place near Islip?

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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Boise to Islip

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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 julio 29, 2025.