ISP - AUS

$159 Find Cheap Flights from Islip to Austin

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Islip to Austin departing on 3/30. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Austin

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Austin, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Austin, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$239
Frontier
Fri 4/17Sun 4/19
ISP - AUS • 1 stop
Cheapest one-way
$159
Multiple Airlines
Mon 3/30
ISP - AUS • 2 stops
Top airlines
Frontier
Cheapest • from $239 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Islip and Austin. You'll need at least 1 connection.
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We hope you love your trip to Austin!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Islip to Austin (ISP-AUS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Islip to Austin that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Islip to Austin

Fri, Apr 17 - Sun, Apr 19
Frontier Logo
4:07 pm - 11:21 am
ISP
-
AUS
20h 14m
1 stop
Frontier Logo
8:20 pm - 9:13 am
AUS
-
ISP
11h 53m
1 stop
$239Frontier
Mon, Apr 13 - Thu, Apr 23
Multiple Airlines Logo
7:34 pm - 4:04 pm
ISP
-
AUS
21h 30m
2 stops
Multiple Airlines Logo
7:12 pm - 9:13 am
AUS
-
ISP
13h 01m
1 stop
$241Multiple Airlines
Mon, Apr 13 - Thu, Apr 23
Multiple Airlines Logo
4:01 pm - 7:17 pm
ISP
-
AUS
28h 16m
1 stop
Multiple Airlines Logo
7:12 pm - 9:13 am
AUS
-
ISP
13h 01m
1 stop
$260Multiple Airlines
Mon, May 4 - Wed, May 13
Frontier Logo
4:07 pm - 8:18 pm
ISP
-
AUS
29h 11m
2 stops
Frontier Logo
11:30 am - 10:05 am
AUS
-
ISP
21h 35m
1 stop
$295Frontier
Sun, Apr 12 - Sun, Apr 19
Multiple Airlines Logo
7:59 pm - 7:17 pm
ISP
-
AUS
24h 18m
1 stop
Multiple Airlines Logo
8:20 pm - 9:13 am
AUS
-
ISP
11h 53m
1 stop
$326Multiple Airlines
Sun, Apr 12 - Sun, Apr 19
Multiple Airlines Logo
7:59 pm - 7:17 pm
ISP
-
AUS
24h 18m
1 stop
Multiple Airlines Logo
6:00 am - 1:31 pm
AUS
-
ISP
30h 31m
2 stops
$328Multiple Airlines
Thu, Apr 16 - Sun, Apr 26
Frontier Logo
8:31 pm - 5:06 pm
ISP
-
AUS
45h 35m
2 stops
Frontier Logo
8:20 pm - 9:28 am
AUS
-
ISP
12h 08m
1 stop
$340Frontier
Tue, Apr 7 - Tue, Apr 14
Multiple Airlines Logo
5:43 pm - 7:17 pm
ISP
-
AUS
26h 34m
1 stop
Multiple Airlines Logo
6:12 am - 11:10 am
AUS
-
ISP
27h 58m
2 stops
$371Multiple Airlines
Thu, Apr 16 - Sun, Apr 26
Multiple Airlines Logo
7:26 pm - 11:21 am
ISP
-
AUS
40h 55m
2 stops
Multiple Airlines Logo
8:20 pm - 9:28 am
AUS
-
ISP
12h 08m
1 stop
$396Multiple Airlines
Tue, Apr 21 - Tue, Apr 28
Southwest Logo
6:30 am - 11:20 am
ISP
-
AUS
5h 50m
1 stop
Southwest Logo
3:40 pm - 10:10 pm
AUS
-
ISP
5h 30m
1 stop
$399Southwest
Booking Insights

KAYAK's insights & trends for Islip to Austin flights

Get data-powered insights and trends into flights from Islip to Austin to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Islip to Austin?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Islip to Austin were found on Frontier ($239) and Southwest ($399).

Find deals

Good to know

Cheapest flight$159
Most popular time to fly with an average 7% increase in price.
Flight from Islip to Austin

When to book flights from Islip to Austin

Are your dates flexible? Find out the best times to travel from Islip to Austin based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Islip to Austin

  • What is the cheapest flight from Islip to Austin?

    In the last 3 days, the lowest price for a flight from Islip to Austin was $159 for a one-way ticket and $239 for a round-trip.

  • Do I need a passport to fly between Islip and Austin?

    No, a passport isn't needed to fly from Islip to Austin. However, local authorities might ask for an official ID.

  • Which aircraft models fly most regularly from Islip to Austin?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Islip to Austin?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Islip to Austin.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Islip to Austin?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Austin from Islip is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Islip to Austin?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Austin with an airline and back to Islip with another airline. Booking your flights between Islip and AUS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Islip to Austin?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Austin from Islip up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Islip to Austin

 
See real verified KAYAK customer reviews for airlines flying from Islip to Austin. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Islip to Austin? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4319 reviews
8.0Comfort
8.1Boarding
7.5Entertainment
8.6Crew
7.0Food
Airline reviews

I elected to pay for the upgrades and found very little difference

6.0 GoodChris, Mar 2026
DAL - SAT
Read more Southwest reviews

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

Snacks are always pretzels. Why can't you also offer peanuts ?

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

Great flight but super high price. Glad it was a business trip and not personal

On time. Friendly staff. Took to long to pre bord all the specialty groups. Cramped small plane

No delays and arrived to destination 30 min early. Staff was super friendly.

Everything a cheap airline should be at normal airline rates.

Everything you need to know for your flight from Islip to Austin

Information on your arrival and departure airports

Islip (ISP)
Austin (AUS)