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$129+ Cheap flights from Islip to Jacksonville (ISP - JAX)

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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — JAX
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Islip to Jacksonville

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Jacksonville (JAX). 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 17, 2025.

Round-trip from

$265
(Kiwi.com)

One-way from

$129
(Kiwi.com)

Popular in

March

Cheapest in

July

Average price

$406
From Islip Long Island to Jacksonville
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One-way flight from Islip Long Island to Jacksonville
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Highest demand for flights based on searches. 11% potential increase in price ($54 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($22 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 Islip to Jacksonville

Cheapest flights from Islip to Jacksonville
Explore the most affordable flight options available from Islip to Jacksonville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Frontier deal was found by Cheapflights users on 9/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/209:49 amISP - JAX
2 stops10h 58mFrontier
Thu 10/305:13 pmJAX - ISP
2 stops15h 56mFrontier
Deal found 9/16$279
This Southwest deal was found by Cheapflights users on 9/16. 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.
Mon 11/105:50 amISP - JAX
1 stop6h 30mSouthwest
Mon 11/175:50 pmJAX - ISP
1 stop4h 15mSouthwest
Deal found 9/16$313
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:38 amISP - JAX
1 stop28h 10mBreeze Airways
Sat 1/33:28 pmJAX - ISP
1 stop18h 30mBreeze Airways
Deal found 9/15$314
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/204:58 pmISP - JAX
2 stops45h 14mMultiple Airlines
Thu 10/302:15 pmJAX - ISP
1 stop4h 41mMultiple Airlines
Deal found 9/16$320
This Southwest deal was found by Cheapflights users on 9/15. 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 10/205:35 pmISP - JAX
1 stop4h 20mSouthwest
Fri 10/246:15 pmJAX - ISP
1 stop5h 30mSouthwest
Deal found 9/15$334
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/252:19 pmISP - JAX
1 stop23h 35mMultiple Airlines
Mon 9/292:34 pmJAX - ISP
2 stops20h 06mMultiple Airlines
Deal found 9/15$348
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/167:36 pmISP - JAX
1 stop13h 22mMultiple Airlines
Wed 10/229:38 amJAX - ISP
2 stops48h 59mMultiple Airlines
Deal found 9/15$350
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/111:35 amISP - JAX
2 stops24h 08mMultiple Airlines
Sun 10/55:48 pmJAX - ISP
1 stop19h 57mMultiple Airlines
Deal found 9/16$356
This Southwest deal was found by Cheapflights users on 9/15. 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.
Wed 12/3112:55 pmISP - JAX
1 stop4h 40mSouthwest
Sat 1/37:45 pmJAX - ISP
1 stop4h 10mSouthwest
Deal found 9/15$362
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/104:58 pmISP - JAX
2 stops17h 53mFrontier
Sun 10/126:05 pmJAX - ISP
2 stops16h 32mFrontier
Deal found 9/14$364
This Southwest deal was found by Cheapflights users on 9/15. 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 10/135:30 amISP - JAX
1 stop5h 05mSouthwest
Mon 10/204:00 pmJAX - ISP
1 stop7h 45mSouthwest
Deal found 9/15$365

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Jacksonville 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 17, 2025.
Use the filters below to find and compare flights from Islip to Jacksonville that are best for you.

Fly from

Islip

Fly to

Jacksonville

Route

Depart

Return

Price

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Sun 2/8

7:26 pm-7:47 pm

1 stop24h 21m

Jacksonville

Sun 3/1

2:21 pm-6:46 pm

1 stop4h 25m

$265

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Mon 10/20

9:49 am-8:47 pm

2 stops10h 58m

Jacksonville

Thu 10/30

5:13 pm-9:09 am

2 stops15h 56m

$279

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Mon 11/10

5:50 am-12:20 pm

1 stop6h 30m

Jacksonville

Mon 11/17

5:50 pm-10:05 pm

1 stop4h 15m

$313

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Mon 10/20

4:58 pm-2:12 pm

2 stops45h 14m

Jacksonville

Thu 10/30

2:15 pm-6:56 pm

1 stop4h 41m

$320

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Sun 2/8

10:31 am-10:35 am

2 stops24h 04m

Jacksonville

Sun 3/1

5:51 pm-1:31 pm

1 stop19h 40m

$326

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Mon 11/10

9:54 am-10:21 am

2 stops24h 27m

Jacksonville

Mon 11/17

10:38 pm-10:37 am

2 stops35h 59m

$334

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Mon 10/20

5:35 pm-9:55 pm

1 stop4h 20m

Jacksonville

Fri 10/24

6:15 pm-11:45 pm

1 stop5h 30m

$334

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Wed 12/31

12:55 pm-5:35 pm

1 stop4h 40m

Jacksonville

Sat 1/3

7:45 pm-11:55 pm

1 stop4h 10m

$362

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Mon 10/13

5:30 am-10:35 am

1 stop5h 05m

Jacksonville

Mon 10/20

4:00 pm-11:45 pm

1 stop7h 45m

$365

IslipJacksonville

ISP - JAX

ISPJAX

Islip Long Island

Sun 10/12

2:19 pm-1:54 pm

1 stop23h 35m

Jacksonville

Sun 10/19

2:15 pm-6:56 pm

1 stop4h 41m

$384

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 21 results
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Best time to book a flight from Islip to Jacksonville

Have a flexible travel schedule? Discover the best time to fly to Jacksonville 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 Jacksonville

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

Currently, August is the cheapest month in which you can book a flight from Islip to Jacksonville (average of $278). Flying from Islip to Jacksonville in March is currently the most expensive (average of $365). 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.

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

Find hourly flight availability from Islip to Jacksonville. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

A simple way to save on the total cost of your ticket is to fly from Islip to Jacksonville at noon. If you’re flexible enough to do this you can expect to save up to 23% on your trip compared to booking a flight in the evening.

How much does it cost to fly round-trip from Islip to Jacksonville?

Reviews of airlines servicing Jacksonville

Get insights into the airlines that provide service to Jacksonville. 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 Jacksonville. Reviews last updated September 17, 2025.
Read through reviews of airlines operating flights from Islip to Jacksonville, such as Southwest. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

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

  • How long is the flight from Islip to Jacksonville?

    Airlines like Breeze Airways, Frontier, and Southwest fly from Islip to Jacksonville in about 6h 30m. The time it takes to get you to your destination can typically vary by up to 17h 51m. The distance between Islip and Jacksonville is about 858 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Islip to Jacksonville round-trip?

    Southwest, at $302, was found to be the cheapest airline from Islip to Jacksonville.. Southwest is currently priced 26% below the average price you’ll pay for this route.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip to Jacksonville 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 to Jacksonville?

    Currently, August is the cheapest month in which you can book a flight from Islip to Jacksonville (average of $278). Flying from Islip to Jacksonville in March is currently the most expensive (average of $365). 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 Jacksonville?

Book flights to Jacksonville if you plan to visit one of these locations
Jacksonville Beach
Orange Park
Kingsland
Fernandina Beach
Waycross

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Alternative routes for Islip to Jacksonville

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Islip to Jacksonville

Discover the top airline that operate flights from Islip to Jacksonville. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$302Average$411FlexibilityNo cancel feeOn-time63%

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