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$89+ Cheap flights from Islip to Austin (ISP - AUS)

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 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — AUS
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Islip to Austin

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Austin (AUS). 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

$288
(Southwest)

One-way from

$89
(Cheapflightsfares)

Popular in

May

Cheapest in

December

Average price

$407
From Islip Long Island to Austin Bergstrom
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One-way flight from Islip Long Island to Austin Bergstrom
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Highest demand for flights based on searches. 28% potential increase in price ($197 potential increase over avg. RT price).
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Cheapest flight prices on average. 11% potential price decrease ($52 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 Austin

Cheapest flights from Islip to Austin
Explore the most affordable flight options available from Islip to Austin. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2511:40 amISP - AUS
1 stop6h 45mMultiple Airlines
Tue 9/305:45 amAUS - ISP
2 stops52h 10mMultiple Airlines
Deal found 9/9$273
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/113:10 pmISP - AUS
1 stop8h 20mSouthwest
Sat 10/185:55 amAUS - ISP
1 stop5h 15mSouthwest
Deal found 9/11$288
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/244:58 pmISP - AUS
1 stop20h 51mMultiple Airlines
Sun 11/25:16 pmAUS - ISP
1 stop16h 21mMultiple Airlines
Deal found 9/10$306
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/211:40 amISP - AUS
2 stops23h 57mFrontier
Mon 10/66:15 pmAUS - ISP
1 stop25h 27mFrontier
Deal found 9/11$311
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/244:58 pmISP - AUS
2 stops28h 13mFrontier
Sun 11/25:16 pmAUS - ISP
1 stop16h 21mFrontier
Deal found 9/10$319
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:35 pmISP - AUS
1 stop7h 55mSouthwest
Sat 10/183:30 pmAUS - ISP
1 stop5h 05mSouthwest
Deal found 9/9$328
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/165:35 pmISP - AUS
1 stop7h 55mSouthwest
Sat 10/183:30 pmAUS - ISP
1 stop5h 05mSouthwest
Deal found 9/9$334
This Kiwi.com deal was found by Cheapflights users on 9/8. 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 11/54:58 pmISP - AUS
1 stop24h 33mFrontier
Mon 11/105:56 pmAUS - ISP
2 stops39h 41mFrontier
Deal found 9/8$337

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Austin 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 Islip to Austin that are best for you.

Fly from

Islip

Fly to

Austin

Route

Depart

Return

Price

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Sat 10/11

3:10 pm-10:30 pm

1 stop8h 20m

Austin Bergstrom

Sat 10/18

5:55 am-12:10 pm

1 stop5h 15m

$288

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Fri 10/17

5:35 pm-12:30 am

1 stop7h 55m

Austin Bergstrom

Sat 10/18

3:30 pm-9:35 pm

1 stop5h 05m

$328

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Thu 10/16

5:35 pm-12:30 am

1 stop7h 55m

Austin Bergstrom

Sat 10/18

3:30 pm-9:35 pm

1 stop5h 05m

$334

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Wed 11/5

4:58 pm-4:31 pm

1 stop24h 33m

Austin Bergstrom

Mon 11/10

5:56 pm-10:37 am

2 stops39h 41m

$337

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Thu 11/6

2:19 pm-12:32 am

2 stops11h 13m

Austin Bergstrom

Sun 11/9

5:16 pm-7:06 pm

1 stop24h 50m

$364

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Fri 11/7

2:47 pm-9:30 am

1 stop19h 43m

Austin Bergstrom

Sun 11/9

5:16 pm-10:37 am

1 stop16h 21m

$382

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Thu 11/6

11:05 am-11:05 pm

1 stop13h 00m

Austin Bergstrom

Sun 11/9

5:20 am-12:50 pm

1 stop6h 30m

$399

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Thu 10/16

5:35 pm-12:30 am

1 stop7h 55m

Austin Bergstrom

Sun 10/19

5:35 am-12:10 pm

1 stop5h 35m

$400

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Thu 9/18

11:40 am-5:25 pm

1 stop6h 45m

$89

IslipAustin

ISP - AUS

ISPAUS

Islip Long Island

Thu 10/2

11:40 am-5:25 pm

1 stop6h 45m

$126

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 12 results
1
2

Best time to book a flight from Islip to Austin

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

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

Currently, August is the cheapest month in which you can book a flight from Islip to Austin (average of $285). Flying from Islip to Austin in March is currently the most expensive (average of $362). 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 Austin

Get insights into the airlines that provide service to Austin. 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 Austin. Reviews last updated September 11, 2025.
See what other customers who have flown with Southwest from Islip to Austin have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

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 Austin. 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 Austin?

    Southwest and Frontier can get you from Islip to Austin in just under 8h 20m. Your travel time can differ by up to 16h 13m. The distance between Islip and Austin is about 1556 mi. This flight may include one or multiple stops.

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

    Currently priced at $320, Southwest will fly you from Islip to Austin and back. In addition to Southwest, many other airlines offer competitively priced options for your trip. Users have found that Southwest is 36% cheaper than the other options available to this destination.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Islip to Austin (average of $285). Flying from Islip to Austin in March is currently the most expensive (average of $362). 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 Austin?

Book flights to Austin if you plan to visit one of these locations
San Marcos
Round Rock
Fredericksburg
Pflugerville
Dripping Springs
Georgetown
Cedar Park
Canyon Lake
Seguin
Horseshoe Bay

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Islip to Austin

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 Austin

Discover the top airline that operate flights from Islip to Austin. 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 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$320Average$472FlexibilityNo cancel feeOn-time63%

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