$201+ Cheap flights from Islip, NY to San Antonio (ISP - SAT)
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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAT
Sep 23 — Sep 301
Round-trip
1 adult, Economy
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Find cheap flights from Islip to San Antonio 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 Islip to San Antonio
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Best
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One-way
Cheapest flights from Islip to San AntonioExplore the most affordable flight options available from Islip to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 24, 2026.
Explore the most affordable flight options available from Islip to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 24, 2026.
This Southwest deal was found by Cheapflights users on 8/19. 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 11/55:40 pm -
1 stop6h 10m
Wed 11/115:30 am -
1 stop5h 15m
Deal found 8/19![Southwest logo]()
$380
This Kiwi.com deal was found by Cheapflights users on 8/22. 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.
Sun 9/67:09 pm -
1 stop14h 47m
Thu 9/109:25 am -
2 stops30h 33m
Deal found 8/22![Multiple Airlines logo]()
$407
This Kiwi.com deal was found by Cheapflights users on 8/21. 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.
Sat 9/511:57 am -
1 stop22h 18m
Wed 9/98:20 pm -
2 stops19h 38m
Deal found 8/21![Multiple Airlines logo]()
$436
This Southwest deal was found by Cheapflights users on 8/23. 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.
Tue 11/36:05 am -
1 stop6h 10m
Sun 11/85:05 am -
1 stop6h 35m
Deal found 8/23![Southwest logo]()
$447
This Kiwi.com deal was found by Cheapflights users on 8/20. 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 9/410:57 am -
1 stop22h 59m
Tue 9/88:26 pm -
2 stops19h 32m
Deal found 8/20![Frontier logo]()
$591
This Southwest deal was found by Cheapflights users on 8/20. 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 9/44:05 pm -
1 stop6h 30m
Tue 9/87:55 am -
1 stop6h 00m
Deal found 8/20![Southwest logo]()
$597
Best flights from Islip to San AntonioDiscover carefully curated flight deals from Islip to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 24, 2026.
Discover carefully curated flight deals from Islip to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 24, 2026.
This Southwest deal was found by Cheapflights users on 8/19. 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 11/55:40 pm -
1 stop6h 10m
Wed 11/115:30 am -
1 stop5h 15m
Deal found 8/19![Southwest logo]()
$380
This Kiwi.com deal was found by Cheapflights users on 8/21. 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.
Sat 9/511:57 am -
1 stop22h 18m
Wed 9/98:20 pm -
2 stops19h 38m
Deal found 8/21![Multiple Airlines logo]()
$436
This Southwest deal was found by Cheapflights users on 8/23. 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.
Tue 11/36:05 am -
1 stop6h 10m
Sun 11/85:05 am -
1 stop6h 35m
Deal found 8/23![Southwest logo]()
$447
This Kiwi.com deal was found by Cheapflights users on 8/22. 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.
Sun 9/67:09 pm -
1 stop14h 47m
Thu 9/109:25 am -
1 stop24h 47m
Deal found 8/22![Multiple Airlines logo]()
$487
This Southwest deal was found by Cheapflights users on 8/20. 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 9/44:05 pm -
1 stop6h 30m
Tue 9/87:55 am -
1 stop6h 00m
Deal found 8/20![Southwest logo]()
$597
This Southwest deal was found by Cheapflights users on 8/22. 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.
Sun 9/64:15 pm -
2 stops8h 05m
Thu 9/105:45 am -
2 stops9h 40m
Deal found 8/22![Southwest logo]()
$607
Last-minute flights from Islip to San AntonioDiscover last-minute flight deals from Islip to San Antonio. Data last updated August 24, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Antonio. Data last updated August 24, 2026 and is based on user searches.
This KAYAK deal was found by Cheapflights users on 8/20. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2611:57 am -
1 stop22h 18m
Mon 8/3111:30 am -
2 stops28h 17m
Deal found 8/20![Breeze Airways logo]()
$794
This KAYAK deal was found by Cheapflights users on 8/20. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2611:57 am -
1 stop22h 18m
Sun 8/309:55 am -
1 stop26h 33m
Deal found 8/20![Breeze Airways logo]()
$888
This Kiwi.com deal was found by Cheapflights users on 8/20. 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 9/410:57 am -
1 stop22h 59m
Tue 9/88:26 pm -
2 stops19h 32m
Deal found 8/20![Frontier logo]()
$591
This Southwest deal was found by Cheapflights users on 8/20. 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 9/44:05 pm -
1 stop6h 30m
Tue 9/87:55 am -
1 stop6h 00m
Deal found 8/20![Southwest logo]()
$597
This Kiwi.com deal was found by Cheapflights users on 8/21. 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.
Sat 9/511:57 am -
1 stop22h 18m
Wed 9/98:20 pm -
2 stops19h 38m
Deal found 8/21![Multiple Airlines logo]()
$436
This Kiwi.com deal was found by Cheapflights users on 8/22. 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.
Sun 9/67:09 pm -
1 stop14h 47m
Thu 9/109:25 am -
2 stops30h 33m
Deal found 8/22![Multiple Airlines logo]()
$407
This Southwest deal was found by Cheapflights users on 8/23. 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 9/76:10 am -
1 stop7h 15m
Fri 9/112:55 pm -
1 stop6h 15m
Deal found 8/23![Southwest logo]()
$809
One-way flights from Islip to San AntonioSearch for one-way flight options from Islip to San Antonio. Find affordable one-way fares based on user searches. Data last updated August 24, 2026.
Search for one-way flight options from Islip to San Antonio. Find affordable one-way fares based on user searches. Data last updated August 24, 2026.
This Jetabroad deal was found by Cheapflights users on 8/23. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/205:43 pm -
1 stop16h 27m
Deal found 8/23![Frontier logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 8/20. 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 9/285:43 pm -
2 stops21h 37m
Deal found 8/20![Frontier logo]()
$208
This Southwest deal was found by Cheapflights users on 8/20. 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 9/284:05 pm -
1 stop6h 30m
Deal found 8/20![Southwest logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 8/20. 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 9/2811:52 am -
3 stops27h 28m
Deal found 8/20![Multiple Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 8/22. 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 12/306:05 am -
1 stop11h 20m
Deal found 8/22![Southwest logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 8/23. 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.
Sun 9/207:31 pm -
3 stops43h 49m
Deal found 8/23![Multiple Airlines logo]()
$274
This KAYAK deal was found by Cheapflights users on 8/21. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/61:38 pm -
3 stops44h 07m
Deal found 8/21![Breeze Airways logo]()
$461
This KAYAK deal was found by Cheapflights users on 8/22. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/188:39 pm -
2 stops37h 06m
Deal found 8/22![Breeze Airways logo]()
$520
This KAYAK deal was found by Cheapflights users on 8/22. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/42:28 pm -
2 stops27h 30m
Deal found 8/22![Breeze Airways logo]()
$555
Find flight deals from Islip to San Antonio
Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to San Antonio (SAT). 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 August 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $380 (Southwest) |
One-way from | $201 (Jetabroad) |
Popular in | June |
Cheapest in | September |
Average price | $448 |
Cheapflights Fare Finder
Customize your flight search to find flights from Islip to San Antonio 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 7,457,451 searches. Data last updated August 24, 2026.
Use the filters below to find and compare flights from Islip to San Antonio that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Thu 11/5
5:40 pm-10:50 pm
1 stop6h 10m
San Antonio
Wed 11/11
5:30 am-11:45 am
1 stop5h 15m
$380
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Sat 9/5
11:57 am-9:15 am
1 stop22h 18m
San Antonio
Wed 9/9
8:20 pm-4:58 pm
2 stops19h 38m
$436
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Tue 11/3
6:05 am-11:15 am
1 stop6h 10m
San Antonio
Sun 11/8
5:05 am-12:40 pm
1 stop6h 35m
$447
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Sun 9/6
7:09 pm-8:56 am
1 stop14h 47m
San Antonio
Thu 9/10
9:25 am-11:12 am
1 stop24h 47m
$487
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Fri 9/4
4:05 pm-9:35 pm
1 stop6h 30m
San Antonio
Tue 9/8
7:55 am-2:55 pm
1 stop6h 00m
$597
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Sun 9/6
4:15 pm-11:20 pm
2 stops8h 05m
San Antonio
Thu 9/10
5:45 am-4:25 pm
2 stops9h 40m
$607
Cheapest one-way
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Sun 9/20
5:43 pm-9:10 am
1 stop16h 27m
$201
Quickest one-way
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Mon 9/28
4:05 pm-9:35 pm
1 stop6h 30m
$212
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Mon 9/28
11:52 am-2:20 pm
3 stops27h 28m
$257
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Wed 12/30
6:05 am-4:25 pm
1 stop11h 20m
$266
Showing 1-10 of 16 resultsSorted by cheapest first
Compare providers for flights from Islip to San Antonio
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to San Antonio in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Islip, New York-San Antonio flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-San Antonio flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-San Antonio flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Islip, New York-San Antonio flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-San Antonio flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Islip to San Antonio
Have a flexible travel schedule? Discover the best time to fly to San Antonio from Islip with our price prediction graph.
ISP-SAT
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.
Reviews of airlines servicing San Antonio
Get insights into the airlines that provide service to San Antonio. 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 San Antonio. Reviews last updated August 24, 2026.
Read through reviews of airlines operating flights from Islip to San Antonio, such as Southwest. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Related info for your journey
Find useful and relevant information for your journey from Islip to San Antonio. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Antonio?
Book flights to San Antonio if you plan to visit one of these locationsNew Braunfels
Kerrville
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Islip and San Antonio flights
Browse other Islip and San Antonio flight options. Last updated on August 24, 2026.
Other flights from Islip
Browse through other flights departing from Islip. Flights are based on user searches made on Cheapflights and were last updated on August 24, 2026.
Popular flight searches
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Other flights to San Antonio
Explore flights to San Antonio departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 24, 2026.
Top airline flying from Islip to San Antonio
Discover the top airline that operate flights from Islip to San Antonio. 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 7,457,451 searches. Data last updated August 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$300 | Average$424 | FlexibilityNo cancel fee | On-time63% |