$310+ Cheap flights from Islip, NY to San Antonio (ISP - SAT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAT
Oct 12 — Oct 191
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
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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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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 September 12, 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 September 12, 2026.
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/303:10 pm -
1 stop8h 55m
Tue 11/35:30 am -
1 stop5h 15m
Deal found 9/10![Southwest logo]()
$379
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 9/2312:00 pm -
1 stop21h 45m
Sun 9/279:25 am -
1 stop24h 47m
Deal found 9/8![Breeze Airways logo]()
$384
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 9/2312:00 pm -
1 stop21h 45m
Sun 9/279:25 am -
2 stops30h 33m
Deal found 9/8![Multiple Airlines logo]()
$422
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.
Wed 12/26:30 am -
1 stop9h 10m
Mon 12/75:30 am -
1 stop5h 15m
Deal found 9/11![Southwest logo]()
$433
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/51:35 pm -
2 stops11h 20m
Sun 11/85:15 am -
1 stop5h 30m
Deal found 9/10![Southwest logo]()
$482
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.
Fri 10/96:55 pm -
2 stops25h 31m
Fri 10/1610:03 am -
1 stop6h 57m
Deal found 9/11![Frontier logo]()
$558
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.
Fri 10/93:10 pm -
1 stop8h 55m
Fri 10/164:55 pm -
1 stop5h 45m
Deal found 9/11![Southwest logo]()
$567
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 September 12, 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 September 12, 2026.
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/303:10 pm -
1 stop8h 55m
Tue 11/35:30 am -
1 stop5h 15m
Deal found 9/10![Southwest logo]()
$379
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 9/2312:00 pm -
1 stop21h 45m
Sun 9/279:25 am -
1 stop24h 47m
Deal found 9/8![Breeze Airways logo]()
$384
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.
Fri 10/96:55 pm -
2 stops25h 31m
Fri 10/1610:03 am -
1 stop6h 57m
Deal found 9/11![Frontier logo]()
$558
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.
Wed 12/26:30 am -
1 stop9h 10m
Mon 12/75:30 am -
1 stop5h 15m
Deal found 9/11![Southwest logo]()
$433
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/51:35 pm -
2 stops11h 20m
Sun 11/85:05 am -
2 stops9h 30m
Deal found 9/10![Southwest logo]()
$487
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 9/225:43 pm -
1 stop16h 24m
Sat 9/268:20 pm -
2 stops44h 43m
Deal found 9/7![Frontier logo]()
$579
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.
Fri 10/93:10 pm -
1 stop8h 55m
Fri 10/164:55 pm -
1 stop5h 45m
Deal found 9/11![Southwest logo]()
$567
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/254:05 pm -
1 stop6h 30m
Tue 9/297:55 am -
1 stop6h 00m
Deal found 9/10![Southwest logo]()
$597
This Southwest deal was found by Cheapflights users on 9/7. 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 9/226:05 am -
1 stop5h 55m
Sat 9/266:00 am -
1 stop7h 30m
Deal found 9/7![Southwest logo]()
$597
Last-minute flights from Islip to San AntonioDiscover last-minute flight deals from Islip to San Antonio. Data last updated September 12, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Antonio. Data last updated September 12, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 9/225:43 pm -
1 stop16h 24m
Sat 9/268:20 pm -
2 stops44h 43m
Deal found 9/7![Frontier logo]()
$579
This Southwest deal was found by Cheapflights users on 9/7. 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 9/226:05 am -
1 stop5h 55m
Sat 9/266:00 am -
1 stop7h 30m
Deal found 9/7![Southwest logo]()
$597
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 9/2312:00 pm -
1 stop21h 45m
Sun 9/279:25 am -
1 stop24h 47m
Deal found 9/8![Breeze Airways logo]()
$384
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 9/2312:00 pm -
1 stop21h 45m
Sun 9/279:25 am -
2 stops30h 33m
Deal found 9/8![Multiple Airlines logo]()
$422
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2512:35 pm -
1 stop6h 35m
Tue 9/297:00 am -
2 stops9h 00m
Deal found 9/10![Southwest logo]()
$602
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:55 am -
1 stop10h 00m
Sat 10/1012:35 pm -
2 stops8h 15m
Deal found 9/8![Southwest logo]()
$603
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.
Fri 10/96:55 pm -
2 stops25h 31m
Fri 10/1610:03 am -
1 stop6h 57m
Deal found 9/11![Frontier logo]()
$558
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.
Fri 10/93:10 pm -
1 stop8h 55m
Fri 10/164:55 pm -
1 stop5h 45m
Deal found 9/11![Southwest logo]()
$567
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/303:10 pm -
1 stop8h 55m
Tue 11/35:30 am -
1 stop5h 15m
Deal found 9/10![Southwest logo]()
$379
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 September 12, 2026.
Search for one-way flight options from Islip to San Antonio. Find affordable one-way fares based on user searches. Data last updated September 12, 2026.
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/312:00 pm -
1 stop21h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Breeze Airways logo]()
$310
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1412:00 pm -
1 stop21h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Breeze Airways logo]()
$320
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/410:57 am -
2 stops26h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Breeze Airways logo]()
$435
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:57 am -
2 stops26h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Breeze Airways logo]()
$485
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/131:38 pm -
3 stops44h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Breeze Airways logo]()
$511
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 September 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $379 (Southwest) |
One-way from | $310 (KAYAK) |
Popular in | June |
Cheapest in | September |
Average price | $385 |
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 September 12, 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
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Wed 10/14
12:00 pm-8:45 am
1 stop21h 45m
San Antonio
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$320
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Fri 10/30
3:10 pm-11:05 pm
1 stop8h 55m
San Antonio
Tue 11/3
5:30 am-11:45 am
1 stop5h 15m
$379
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Wed 9/23
12:00 pm-8:45 am
1 stop21h 45m
San Antonio
Sun 9/27
9:25 am-11:12 am
1 stop24h 47m
$384
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Wed 12/2
6:30 am-2:40 pm
1 stop9h 10m
San Antonio
Mon 12/7
5:30 am-11:45 am
1 stop5h 15m
$433
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Sun 10/4
10:57 am-11:58 am
2 stops26h 01m
San Antonio
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$435
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Thu 10/15
10:57 am-11:58 am
2 stops26h 01m
San Antonio
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$485
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Thu 11/5
1:35 pm-11:55 pm
2 stops11h 20m
San Antonio
Sun 11/8
5:05 am-3:35 pm
2 stops9h 30m
$487
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Tue 10/13
1:38 pm-8:45 am
3 stops44h 07m
San Antonio
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$511
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Fri 10/9
6:55 pm-7:26 pm
2 stops25h 31m
San Antonio
Fri 10/16
10:03 am-6:00 pm
1 stop6h 57m
$558
IslipSan Antonio
ISP Islip Long Island - SAT San Antonio
ISPSAT
Islip Long Island
Fri 10/9
3:10 pm-11:05 pm
1 stop8h 55m
San Antonio
Fri 10/16
4:55 pm-11:40 pm
1 stop5h 45m
$567
Showing 1-10 of 13 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 September.
| 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 September 12, 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.
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
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 September 12, 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 September 12, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 September 12, 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 September 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$300 | Average$424 | FlexibilityNo cancel fee | On-time63% |