$182+ 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAT
Aug 8 — Aug 151
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 July 9, 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 July 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/7. 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.
Sat 8/111:57 am
ISP
- SAT
1 stop22h 18m
Multiple Airlines
Sat 8/85:38 pm
SAT
- ISP
2 stops39h 15m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$388
This Southwest deal was found by Cheapflights users on 7/7. 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.
Sat 8/15:35 pm
ISP
- SAT
1 stop6h 35m
Southwest
Sat 8/86:00 am
SAT
- ISP
1 stop7h 30m
Southwest
Deal found 7/7![Southwest logo]()
$435
This Southwest deal was found by Cheapflights users on 7/9. 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.
Wed 11/255:55 pm
ISP
- SAT
1 stop8h 00m
Southwest
Sat 11/285:10 am
SAT
- ISP
1 stop10h 15m
Southwest
Deal found 7/9![Southwest logo]()
$492
This Southwest deal was found by Cheapflights users on 7/5. 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 8/25:55 pm
ISP
- SAT
1 stop8h 20m
Southwest
Sat 8/810:05 am
SAT
- ISP
1 stop8h 25m
Southwest
Deal found 7/5![Southwest logo]()
$554
This Southwest deal was found by Cheapflights users on 7/8. 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 7/235:50 pm
ISP
- SAT
1 stop6h 35m
Southwest
Mon 7/275:10 am
SAT
- ISP
1 stop5h 40m
Southwest
Deal found 7/8![Southwest logo]()
$587
This Booking.com deal was found by Cheapflights users on 7/5. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1010:57 am
ISP
- SAT
1 stop29h 44m
Multiple Airlines
Mon 7/1311:30 am
SAT
- ISP
2 stops28h 17m
Multiple Airlines
Deal found 7/5![Multiple Airlines logo]()
$649
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 July 9, 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 July 9, 2026.
This Southwest deal was found by Cheapflights users on 7/7. 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.
Sat 8/15:35 pm
ISP
- SAT
1 stop6h 35m
Southwest
Sat 8/86:00 am
SAT
- ISP
1 stop7h 30m
Southwest
Deal found 7/7![Southwest logo]()
$435
This KAYAK deal was found by Cheapflights users on 7/7. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:27 pm
ISP
- SAT
2 stops23h 46m
Breeze Airways
Fri 9/411:30 am
SAT
- ISP
2 stops22h 47m
Breeze Airways
Deal found 7/7![Breeze Airways logo]()
$718
This Southwest deal was found by Cheapflights users on 7/9. 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.
Wed 11/255:55 pm
ISP
- SAT
1 stop8h 00m
Southwest
Sat 11/285:10 am
SAT
- ISP
1 stop10h 15m
Southwest
Deal found 7/9![Southwest logo]()
$492
This Southwest deal was found by Cheapflights users on 7/5. 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 8/25:55 pm
ISP
- SAT
1 stop8h 20m
Southwest
Sat 8/810:05 am
SAT
- ISP
1 stop8h 25m
Southwest
Deal found 7/5![Southwest logo]()
$554
This Southwest deal was found by Cheapflights users on 7/8. 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 7/235:50 pm
ISP
- SAT
1 stop6h 35m
Southwest
Mon 7/275:10 am
SAT
- ISP
1 stop5h 40m
Southwest
Deal found 7/8![Southwest logo]()
$587
This Gotogate deal was found by Cheapflights users on 7/8. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/236:46 pm
ISP
- SAT
3 stops46h 27m
Breeze Airways
Mon 7/2711:30 am
SAT
- ISP
2 stops28h 17m
Breeze Airways
Deal found 7/8![Breeze Airways logo]()
$959
This KAYAK deal was found by Cheapflights users on 7/5. 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.
Mon 8/38:43 pm
ISP
- SAT
3 stops44h 30m
Breeze Airways
Mon 8/1011:30 am
SAT
- ISP
3 stops24h 58m
Breeze Airways
Deal found 7/5![Breeze Airways logo]()
$978
Last-minute flights from Islip to San AntonioDiscover last-minute flight deals from Islip to San Antonio. Data last updated July 9, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Antonio. Data last updated July 9, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 7/5. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1010:57 am
ISP
- SAT
1 stop29h 44m
Multiple Airlines
Mon 7/1311:30 am
SAT
- ISP
2 stops28h 17m
Multiple Airlines
Deal found 7/5![Multiple Airlines logo]()
$649
This Kiwi.com deal was found by Cheapflights users on 7/6. 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 7/1111:57 am
ISP
- SAT
1 stop22h 18m
Multiple Airlines
Tue 7/147:39 pm
SAT
- ISP
2 stops13h 14m
Multiple Airlines
Deal found 7/6![Multiple Airlines logo]()
$738
This Kiwi.com deal was found by Cheapflights users on 7/6. 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 7/1310:57 am
ISP
- SAT
2 stops34h 40m
Multiple Airlines
Sun 7/199:55 am
SAT
- ISP
1 stop26h 33m
Multiple Airlines
Deal found 7/6![Multiple Airlines logo]()
$692
This Southwest deal was found by Cheapflights users on 7/8. 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 7/235:50 pm
ISP
- SAT
1 stop6h 35m
Southwest
Mon 7/275:10 am
SAT
- ISP
1 stop5h 40m
Southwest
Deal found 7/8![Southwest logo]()
$587
This Kiwi.com deal was found by Cheapflights users on 7/7. 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.
Sat 8/111:57 am
ISP
- SAT
1 stop22h 18m
Multiple Airlines
Sat 8/85:38 pm
SAT
- ISP
2 stops39h 15m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$388
This Southwest deal was found by Cheapflights users on 7/7. 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.
Sat 8/15:35 pm
ISP
- SAT
1 stop6h 35m
Southwest
Sat 8/86:00 am
SAT
- ISP
1 stop7h 30m
Southwest
Deal found 7/7![Southwest logo]()
$435
This Southwest deal was found by Cheapflights users on 7/5. 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 8/25:55 pm
ISP
- SAT
1 stop8h 20m
Southwest
Sat 8/810:05 am
SAT
- ISP
1 stop8h 25m
Southwest
Deal found 7/5![Southwest logo]()
$554
This KAYAK deal was found by Cheapflights users on 7/5. 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.
Mon 8/38:43 pm
ISP
- SAT
3 stops44h 30m
Breeze Airways
Mon 8/1011:30 am
SAT
- ISP
2 stops28h 17m
Breeze Airways
Deal found 7/5![Breeze Airways logo]()
$824
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 July 9, 2026.
Search for one-way flight options from Islip to San Antonio. Find affordable one-way fares based on user searches. Data last updated July 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Sat 8/1511:57 am
ISP
- SAT
1 stop22h 18m
Breeze Airways
Deal found 7/8![Breeze Airways logo]()
$182
This Southwest deal was found by Cheapflights users on 7/8. 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.
Sat 8/1511:55 am
ISP
- SAT
2 stops9h 55m
Southwest
Deal found 7/8![Southwest logo]()
$239
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Sat 8/1511:57 am
ISP
- SAT
3 stops57h 40m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$273
This Kiwi.com deal was found by Cheapflights users on 7/8. 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 7/1511:57 am
ISP
- SAT
1 stop22h 18m
Breeze Airways
Deal found 7/8![Breeze Airways logo]()
$284
This KAYAK deal was found by Cheapflights users on 7/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/511:57 am
ISP
- SAT
1 stop22h 18m
Breeze Airways
Deal found 7/8![Breeze Airways logo]()
$340
This Southwest deal was found by Cheapflights users on 7/7. 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.
Sun 7/265:55 pm
ISP
- SAT
1 stop8h 20m
Southwest
Deal found 7/7![Southwest logo]()
$354
This Kiwi.com deal was found by Cheapflights users on 7/8. 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 7/1510:57 am
ISP
- SAT
2 stops34h 40m
Frontier
Deal found 7/8![Frontier logo]()
$358
This Kiwi.com deal was found by Cheapflights users on 7/8. 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 7/1511:57 am
ISP
- SAT
3 stops33h 40m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$377
This KAYAK deal was found by Cheapflights users on 7/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/42:08 pm
ISP
- SAT
3 stops27h 05m
Breeze Airways
Deal found 7/8![Breeze Airways logo]()
$461
This KAYAK deal was found by Cheapflights users on 7/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/38:43 pm
ISP
- SAT
3 stops44h 30m
Breeze Airways
Deal found 7/8![Breeze Airways logo]()
$516
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 July 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $388 (Kiwi.com) |
One-way from | $182 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $467 |
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 2,558,603 searches. Data last updated July 9, 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 - SAT
ISPSAT
Islip Long Island
Sat 8/1
5:35 pm-11:10 pm
1 stop6h 35m
San Antonio
Sat 8/8
6:00 am-2:30 pm
1 stop7h 30m
$435
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Wed 11/25
5:55 pm-12:55 am
1 stop8h 00m
San Antonio
Sat 11/28
5:10 am-4:25 pm
1 stop10h 15m
$492
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Sun 8/2
5:55 pm-1:15 am
1 stop8h 20m
San Antonio
Sat 8/8
10:05 am-7:30 pm
1 stop8h 25m
$554
Quickest round-trip
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Thu 7/23
5:50 pm-11:25 pm
1 stop6h 35m
San Antonio
Mon 7/27
5:10 am-11:50 am
1 stop5h 40m
$587
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Tue 9/1
5:27 pm-4:13 pm
2 stops23h 46m
San Antonio
Fri 9/4
11:30 am-11:17 am
2 stops22h 47m
$718
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Thu 7/23
6:46 pm-4:13 pm
3 stops46h 27m
San Antonio
Mon 7/27
11:30 am-4:47 pm
2 stops28h 17m
$959
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Mon 8/3
8:43 pm-4:13 pm
3 stops44h 30m
San Antonio
Mon 8/10
11:30 am-1:28 pm
3 stops24h 58m
$978
Cheapest one-way
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Sat 8/15
11:55 am-8:50 pm
2 stops9h 55m
$239
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Wed 7/15
11:57 am-9:15 am
1 stop22h 18m
$284
Quickest one-way
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Sun 7/26
5:55 pm-1:15 am
1 stop8h 20m
$354
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 July.
| 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 July 9, 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.
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Boarding
8.1
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
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Other flights from Islip
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Popular flight searches
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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 2,558,603 searches. Data last updated July 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$300 | Average$386 | FlexibilityNo cancel fee | On-time63% |