HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$1,378+ Cheap flights from Missoula to Islip, NY (MSO - 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
MSO — ISP
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Missoula to Islip with Cheapflights

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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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 Missoula to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Missoula (MSO) 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 July 29, 2025.

Round-trip from

$1,378
(United)

Popular in

December

Cheapest in

January

Average price

$384
From Missoula Johnson-Bell Field to Islip Long Island
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($69 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Missoula to Islip

Cheapest flights from Missoula to Islip
Explore the most affordable flight options available from Missoula to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This United deal was found by Cheapflights users on 7/28. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/112:29 pmMSO - ISP
2 stops18h 29mMultiple Airlines
Fri 8/154:33 pmISP - MSO
2 stops21h 05mMultiple Airlines
Deal found 7/28$1,378

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missoula 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 July 29, 2025.
Use the filters below to find and compare flights from Missoula to Islip that are best for you.

Fly from

Missoula

Fly to

Islip

Route

Depart

Return

Price

MissoulaIslip

MSO - ISP

MSOISP

Missoula Johnson-Bell Field

Mon 8/11

2:29 pm-10:58 am

2 stops18h 29m

Islip Long Island

Fri 8/15

4:33 pm-11:38 am

2 stops21h 05m

$1,378

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Best time to book a flight from Missoula to Islip

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

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

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

Related info for your journey

Find useful and relevant information for your journey from Missoula 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 Missoula to Islip that include hotel bookings?

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

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

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

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

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

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

See more FAQs

Traveling to a place near Islip?

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

Browse thousands of different options on Cheapflights for your next trip

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

Alternative routes for Missoula to Islip

See prices for flight routes from nearby airports that may be better suited for you.
Missoula to John F Kennedy Intl flights
Missoula to LaGuardia flights
Bozeman to Newark flights
Missoula to Newark flights
Bozeman to John F Kennedy Intl flights
Bozeman to LaGuardia flights
Billings to Newark flights
Kalispell to LaGuardia flights
Kalispell to John F Kennedy Intl flights
Billings to John F Kennedy Intl flights
Kalispell to Newark flights
Billings to LaGuardia flights
Bozeman to Buffalo flights
Great Falls to Newark flights
Helena to Buffalo flights
Great Falls to John F Kennedy Intl flights
Great Falls to LaGuardia flights
Bozeman to Albany flights
Billings to Rochester flights
Kalispell to Buffalo flights
Missoula to Buffalo flights
Bozeman to Syracuse flights
Billings to Buffalo flights
Helena to Syracuse flights
Missoula to Albany flights
Billings to Syracuse flights
Helena to John F Kennedy Intl flights
Bozeman to White Plains flights
Great Falls to Buffalo flights
Bozeman to Ithaca flights
Butte to LaGuardia flights
Butte to Albany flights
Helena to Albany flights
Helena to Newark flights
Helena to LaGuardia flights
Missoula to Elmira flights
Billings to Ithaca flights
Bozeman to Binghamton flights
Kalispell to Syracuse flights
Missoula to White Plains flights
Bozeman to Islip flights
Helena to Rochester flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.