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$405+ Cheap flights from Islip, NY (ISP) to Montana

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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — BZN
Apr 16 — Apr 231
Thu 4/16
Thu 4/23
1 adult, Economy
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Cheap flight deals from Islip to Montana

Cheapest flights from Islip to Montana
Explore the most affordable flight options available from Islip to Montana. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 17, 2026.

This Southwest deal was found by Cheapflights users on 3/17. 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.
Tue 4/146:30 am
ISP
-
BZN
2 stops10h 10m
Southwest
Tue 4/213:20 pm
BZN
-
ISP
2 stops20h 30m
Southwest
Deal found 3/17$405
This Southwest deal was found by Cheapflights users on 3/17. 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 6/106:00 am
ISP
-
BZN
2 stops9h 50m
Southwest
Wed 6/107:05 pm
BZN
-
ISP
2 stops11h 15m
Southwest
Deal found 3/17$448
This Southwest deal was found by Cheapflights users on 3/16. 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.
Tue 9/226:05 am
ISP
-
BZN
2 stops8h 10m
Southwest
Sat 9/264:10 pm
BZN
-
ISP
2 stops15h 45m
Southwest
Deal found 3/16$493
This Southwest deal was found by Cheapflights users on 3/17. 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 6/1112:30 pm
ISP
-
BZN
2 stops13h 00m
Southwest
Tue 6/167:05 pm
BZN
-
ISP
2 stops11h 00m
Southwest
Deal found 3/17$537
This Southwest deal was found by Cheapflights users on 3/17. 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.
Tue 6/92:55 pm
ISP
-
BZN
2 stops9h 45m
Southwest
Sun 6/144:30 pm
BZN
-
ISP
2 stops13h 50m
Southwest
Deal found 3/17$544
This Southwest deal was found by Cheapflights users on 3/17. 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 6/1112:30 pm
ISP
-
BZN
2 stops13h 00m
Southwest
Sun 6/144:30 pm
BZN
-
ISP
2 stops13h 50m
Southwest
Deal found 3/17$586
This Southwest deal was found by Cheapflights users on 3/15. 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.
Mon 3/302:00 pm
ISP
-
BZN
2 stops10h 45m
Southwest
Fri 4/37:35 am
BZN
-
ISP
2 stops13h 05m
Southwest
Deal found 3/15$640
This KAYAK deal was found by Cheapflights users on 3/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/169:59 am
ISP
-
BZN
1 stop27h 43m
Multiple Airlines
Mon 7/2012:37 pm
BZN
-
ISP
1 stop20h 28m
Multiple Airlines
Deal found 3/17$1,044

Find flight deals from Islip to Montana

Keep the following information in mind while searching for Islip to Montana flight deals. Data was last updated March 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$640
(Southwest)

One-way from

$563
(KAYAK)

Popular in

December

Cheapest in

November

Average price

$402
Provider with most accurate pricing for New York (NYC)-Bozeman Gallatin Field flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Bozeman Gallatin Field flights.
Search Deals
From Islip Long Island to Montana
Search Deals
One-way flight from Islip Long Island to Montana
Search Deals
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Montana 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 March 17, 2026.
Use the filters below to find and compare flights from Islip to Montana that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipBozeman

ISP - BZN

ISPBZN

Islip Long Island

Tue 4/14

6:30 am-2:40 pm

2 stops10h 10m

Bozeman Gallatin Field

Tue 4/21

3:20 pm-1:50 pm

2 stops20h 30m

$405
Quickest round-trip

IslipBozeman

ISP - BZN

ISPBZN

Islip Long Island

Wed 6/10

6:00 am-1:50 pm

2 stops9h 50m

Bozeman Gallatin Field

Wed 6/10

7:05 pm-8:20 am

2 stops11h 15m

$448

IslipBozeman

ISP - BZN

ISPBZN

Islip Long Island

Wed 6/10

4:40 pm-12:45 am

2 stops10h 05m

Bozeman Gallatin Field

Sun 6/14

4:30 pm-8:20 am

2 stops13h 50m

$544

IslipBozeman

ISP - BZN

ISPBZN

Islip Long Island

Tue 6/9

2:55 pm-10:40 pm

2 stops9h 45m

Bozeman Gallatin Field

Sun 6/14

4:30 pm-8:20 am

2 stops13h 50m

$544

IslipBozeman

ISP - BZN

ISPBZN

Islip Long Island

Mon 3/30

2:00 pm-10:45 pm

2 stops10h 45m

Bozeman Gallatin Field

Fri 4/3

7:35 am-10:40 pm

2 stops13h 05m

$640

IslipBozeman

ISP - BZN

ISPBZN

Islip Long Island

Thu 7/16

9:59 am-11:42 am

1 stop27h 43m

Bozeman Gallatin Field

Mon 7/20

12:37 pm-11:05 am

1 stop20h 28m

$1,134
Cheapest one-way

IslipBozeman

ISP - BZN

ISPBZN

Islip Long Island

Thu 8/6

9:59 am-11:22 pm

2 stops15h 23m

$634
Quickest one-way

IslipBozeman

ISP - BZN

ISPBZN

Islip Long Island

Fri 8/7

12:30 pm-11:22 pm

2 stops12h 52m

$713

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/16

Sorted by cheapest first

Best time to book a flight from Islip to Montana

Have a flexible travel schedule? Discover the best time to fly to Montana from Islip 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 Islip to Montana

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

Currently, April is the cheapest month in which you can book a flight from Islip, New York to Montana (average of $174). Flying from Islip, New York to Montana in September is currently the most expensive (average of $275). 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 Islip to Montana. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to Montana?

    If you book a flight to Montana from Islip, you will be flying from Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip.

  • How long is the flight from Islip, New York to Montana?

    A quick flight from Islip, New York to Montana can take about 10h 10m. Southwest provides one of the quickest options available for as low as $405. Airlines will cover a distance of 1925 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip to Montana 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 Islip, New York to Montana?

    Currently, April is the cheapest month in which you can book a flight from Islip, New York to Montana (average of $174). Flying from Islip, New York to Montana in September is currently the most expensive (average of $275). 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

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