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Flights from Islip to Austin

Find flight deals from Islip to Austin for the next 3 months. Book one way flights from PLN 326 or round trip flights from PLN 609.

      • ISP 8:46 PM
        20h 18m
        1 stop
        AUS 4:04 PM
        Islip - Austin | Thu, Jan 8 | Frontier Airlines
        AUS 4:59 PM
        28h 47m
        1 stop
        ISP 10:46 PM
        Austin - Islip | Mon, Jan 12 | Spirit Airlines
        PLN 609 PLN 3,145
        81% OFF
        81% OFF
        PLN 3,145 PLN 609
      • ISP 5:27 PM
        29h 30m
        1 stop
        AUS 9:57 PM
        Islip - Austin | Wed, Dec 24 | Frontier Airlines
        AUS 6:00 AM
        12h 40m
        1 stop
        ISP 7:40 PM
        Austin - Islip | Mon, Dec 29 | Spirit Airlines
        PLN 1,089 PLN 3,145
        65% OFF
        65% OFF
        PLN 3,145 PLN 1,089
      • ISP 4:40 PM
        9h 18m
        1 stop
        AUS 12:58 AM
        Islip - Austin | Sat, Dec 20 | Frontier Airlines
        AUS 5:30 AM
        18h 25m
        1 stop
        ISP 12:55 AM
        Austin - Islip | Sat, Dec 27 | Spirit Airlines
        PLN 1,203 PLN 3,145
        62% OFF
        62% OFF
        PLN 3,145 PLN 1,203
      • ISP 7:56 PM
        21h 51m
        1 stop
        AUS 4:47 PM
        Islip - Austin | Sat, Jan 10 | Frontier Airlines
        AUS 6:02 PM
        27h 44m
        1 stop
        ISP 10:46 PM
        Austin - Islip | Mon, Jan 12 | Frontier Airlines
        PLN 1,316
        57% OFF
        PLN 3,145 PLN 1,316
      • ISP 4:40 PM
        9h 18m
        1 stop
        AUS 12:58 AM
        Islip - Austin | Fri, Dec 19 | Frontier Airlines
        AUS 5:30 AM
        18h 25m
        1 stop
        ISP 12:55 AM
        Austin - Islip | Sat, Dec 27 | Spirit Airlines
        PLN 1,358
        56% OFF
        PLN 3,145 PLN 1,358
      • ISP 11:50 AM
        11h 18m
        1 stop
        AUS 10:08 PM
        Islip - Austin | Wed, Dec 17 | Jetblue Airways
        AUS 6:10 AM
        11h 35m
        1 stop
        ISP 6:45 PM
        Austin - Islip | Thu, Dec 25 | Jetblue Airways
        PLN 2,285
        27% OFF
        PLN 3,145 PLN 2,285
      • ISP 12:25 PM
        10h 51m
        1 stop
        AUS 10:16 PM
        Islip - Austin | Sun, Jan 18 | Jetblue Airways
        AUS 6:00 AM
        28h 35m
        1 stop
        ISP 11:35 AM
        Austin - Islip | Thu, Jan 22 | Jetblue Airways
        PLN 2,307
        27% OFF
        PLN 3,145 PLN 2,307
      • ISP 12:25 PM
        10h 51m
        1 stop
        AUS 10:16 PM
        Islip - Austin | Thu, Jan 29 | Jetblue Airways
        AUS 6:00 AM
        28h 35m
        1 stop
        ISP 11:35 AM
        Austin - Islip | Sun, Feb 1 | Jetblue Airways
        PLN 2,373
        25% OFF
        PLN 3,145 PLN 2,373
      • ISP 7:30 AM
        30h 5m
        1 stop
        AUS 12:35 PM
        Islip - Austin | Sun, Jan 18 | Cape Air
        AUS 6:00 AM
        28h 35m
        1 stop
        ISP 11:35 AM
        Austin - Islip | Thu, Jan 22 | Jetblue Airways
        PLN 2,397
        24% OFF
        PLN 3,145 PLN 2,397
      • ISP 9:59 AM
        14h 21m
        1 stop
        AUS 11:20 PM
        Islip - Austin | Fri, Dec 12 | Cape Air
        AUS 7:25 AM
        7h 45m
        1 stop
        ISP 4:10 PM
        Austin - Islip | Sun, Dec 14 | Delta Air Lines
        PLN 2,831
        10% OFF
        PLN 3,145 PLN 2,831
      • ISP 1:00 PM
        17h 25m
        1 stop
        AUS Invalid Date
        Islip - Austin | Sat, Dec 13 | Normal Airline
        AUS 3:00 PM
        6h
        Nonstop
        ISP 4:00 PM
        Austin - Islip | Mon, Dec 15 | Normal Airline
        Find More Flights
        Find More Flights
      • ISP 7:43 PM
        21h 21m
        1 stop
        AUS 4:04 PM
        Islip - Austin | Mon, Jan 26 | Frontier Airlines
        PLN 326 PLN 709
        54% OFF
        54% OFF
        PLN 709 PLN 326
      • ISP 8:55 PM
        14h 26m
        1 stop
        AUS 10:21 AM
        Islip - Austin | Fri, Jan 23 | Frontier Airlines
        PLN 398 PLN 709
        44% OFF
        44% OFF
        PLN 709 PLN 398
      • ISP 9:52 AM
        9h 42m
        1 stop
        AUS 6:34 PM
        Islip - Austin | Thu, Jan 15 | Frontier Airlines
        PLN 458 PLN 709
        35% OFF
        35% OFF
        PLN 709 PLN 458
      • ISP 8:00 AM
        9h 4m
        1 stop
        AUS 4:04 PM
        Islip - Austin | Wed, Jan 14 | Frontier Airlines
        PLN 461
        35% OFF
        PLN 709 PLN 461
      • ISP 12:25 PM
        10h 10m
        1 stop
        AUS 9:35 PM
        Islip - Austin | Mon, Jan 26 | Jetblue Airways
        PLN 490
        31% OFF
        PLN 709 PLN 490
      • ISP 4:40 PM
        9h 18m
        1 stop
        AUS 12:58 AM
        Islip - Austin | Sat, Dec 20 | Frontier Airlines
        PLN 527
        26% OFF
        PLN 709 PLN 527
      • ISP 4:40 PM
        22h 28m
        1 stop
        AUS 2:08 PM
        Islip - Austin | Wed, Dec 31 | Frontier Airlines
        PLN 533
        25% OFF
        PLN 709 PLN 533
      • ISP 12:25 PM
        10h 10m
        1 stop
        AUS 9:35 PM
        Islip - Austin | Wed, Jan 14 | Jetblue Airways
        PLN 538
        24% OFF
        PLN 709 PLN 538
      • ISP 9:25 AM
        10h 6m
        1 stop
        AUS 6:31 PM
        Islip - Austin | Sun, Feb 1 | Frontier Airlines
        PLN 603
        15% OFF
        PLN 709 PLN 603
      • ISP 12:25 PM
        10h 10m
        1 stop
        AUS 9:35 PM
        Islip - Austin | Thu, Jan 15 | Jetblue Airways
        PLN 638
        10% OFF
        PLN 709 PLN 638
      • ISP 1:00 PM
        17h 25m
        1 stop
        AUS Invalid Date
        Islip - Austin | Sat, Dec 13 | Normal Airline
        Find More Flights
        Find More Flights

Displayed flight fares from Islip to Austin are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight Info | Islip to Austin

The distance between Islip and Austin is approximately 2,507.39 km. Based on Trip.com's data travel demand peaks in December. The off-season for travel is September.

Cheapest one-way flight pricePLN 326
Cheapest round-trip ticket pricePLN 609
Off-season for travelSeptember
Peak season for travelDecember
Flight distance2,507.39 km

When is the cheapest time to fly from Islip to Austin?

The cheapest time for Islip to Austin flights: Jan 25 to Feb 1 — one way flight prices from PLN 325.

Cheapest flights
From price
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  • 714
  • 1421
  • 2128

  • Jan

    284
  • 411
  • 1118
  • 1825

  • Feb

    251
  • 18
  • 815
  • 1522

  • Mar

    221
Displayed fare trends are based on Trip.com's aggregated average of the lowest flight prices from Islip to Austin, calculated over the upcoming 10 weeks.

Frequently Asked Questions

  • What are the cheapest flights from Islip to Austin (ISP-AUS)?

    Based on Trip.com data, Frontier Airlines offers one-way fares as low as PLN 326 on Cheapest nonstop routes (e.g. ISP to AUS on Mon, Jan 26), while Frontier Airlines offers Cheapest nonstop round-trips from PLN 609 departing on Thu, Jan 8 and returning on Mon, Jan 12.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Islip to Austin is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Islip to Austin, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Jan 26, with one-way flights priced at just PLN 326.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Austin travel is around December.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Islip to Austin is September, when demand for travel is lower.
  • After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Islip to Austin on December 24, 2025 with Frontier Airlines, with prices starting at PLN 1,088.
  • The time difference between Austin and Islip is 1h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

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