$154+ Cheap flights from San Antonio to Islip, NY (SAT - ISP)
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 8/21. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ISP
Aug 17 — Aug 241
Round-trip
1 adult, Economy
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Find cheap flights from San Antonio to Islip with Cheapflights
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Best
Last-minute
One-way
Cheapest flights from San Antonio to IslipExplore the most affordable flight options available from San Antonio to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 18, 2026.
Explore the most affordable flight options available from San Antonio to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 18, 2026.
This Southwest deal was found by Cheapflights users on 7/14. 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 9/167:55 am
SAT
- ISP
1 stop6h 00m
Southwest
Mon 9/214:05 pm
ISP
- SAT
1 stop6h 25m
Southwest
Deal found 7/14![Southwest logo]()
$363
This Southwest deal was found by Cheapflights users on 7/14. 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 9/32:55 pm
SAT
- ISP
1 stop6h 10m
Southwest
Tue 9/86:05 am
ISP
- SAT
1 stop5h 55m
Southwest
Deal found 7/14![Southwest logo]()
$372
This Southwest deal was found by Cheapflights users on 7/14. 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 9/112:55 pm
SAT
- ISP
1 stop6h 10m
Southwest
Sun 9/134:35 pm
ISP
- SAT
1 stop6h 05m
Southwest
Deal found 7/14![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 7/14. 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 9/32:55 pm
SAT
- ISP
1 stop6h 10m
Southwest
Mon 9/76:10 am
ISP
- SAT
1 stop7h 15m
Southwest
Deal found 7/14![Southwest logo]()
$424
Best flights from San Antonio to IslipDiscover carefully curated flight deals from San Antonio to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 18, 2026.
Discover carefully curated flight deals from San Antonio to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 18, 2026.
This Southwest deal was found by Cheapflights users on 7/15. 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 9/1611:30 am
SAT
- ISP
2 stops8h 35m
Southwest
Mon 9/214:05 pm
ISP
- SAT
1 stop6h 25m
Southwest
Deal found 7/15![Southwest logo]()
$368
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 8/19:32 pm
SAT
- ISP
2 stops44h 29m
Multiple Airlines
Wed 8/511:57 am
ISP
- SAT
1 stop22h 18m
Multiple Airlines
Deal found 7/17![Multiple Airlines logo]()
$510
This Southwest deal was found by Cheapflights users on 7/14. 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 9/32:55 pm
SAT
- ISP
1 stop6h 10m
Southwest
Tue 9/86:05 am
ISP
- SAT
1 stop5h 55m
Southwest
Deal found 7/14![Southwest logo]()
$372
This Southwest deal was found by Cheapflights users on 7/14. 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 9/210:50 am
SAT
- ISP
2 stops9h 15m
Southwest
Sun 9/64:15 pm
ISP
- SAT
2 stops8h 05m
Southwest
Deal found 7/14![Southwest logo]()
$373
This Southwest deal was found by Cheapflights users on 7/14. 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 9/112:55 pm
SAT
- ISP
1 stop6h 10m
Southwest
Sun 9/134:35 pm
ISP
- SAT
1 stop6h 05m
Southwest
Deal found 7/14![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 7/14. 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 9/312:20 pm
SAT
- ISP
2 stops8h 45m
Southwest
Mon 9/76:10 am
ISP
- SAT
2 stops9h 05m
Southwest
Deal found 7/14![Southwest logo]()
$434
This Southwest deal was found by Cheapflights users on 7/17. 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 8/15:10 am
SAT
- ISP
1 stop5h 25m
Southwest
Wed 8/510:55 am
ISP
- SAT
1 stop8h 05m
Southwest
Deal found 7/17![Southwest logo]()
$587
This Southwest deal was found by Cheapflights users on 7/15. 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 7/313:40 pm
SAT
- ISP
2 stops7h 00m
Southwest
Tue 8/43:20 pm
ISP
- SAT
2 stops8h 45m
Southwest
Deal found 7/15![Southwest logo]()
$597
Last-minute flights from San Antonio to IslipDiscover last-minute flight deals from San Antonio to Islip. Data last updated July 18, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Islip. Data last updated July 18, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 7/15. 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 7/313:40 pm
SAT
- ISP
2 stops7h 00m
Southwest
Tue 8/46:05 am
ISP
- SAT
1 stop5h 55m
Southwest
Deal found 7/15![Southwest logo]()
$592
This Gotogate deal was found by Cheapflights users on 7/15. 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.
Fri 7/3111:30 am
SAT
- ISP
2 stops22h 47m
Breeze Airways
Tue 8/42:08 pm
ISP
- SAT
3 stops27h 05m
Breeze Airways
Deal found 7/15![Breeze Airways logo]()
$864
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 8/19:32 pm
SAT
- ISP
2 stops44h 29m
Multiple Airlines
Wed 8/511:57 am
ISP
- SAT
1 stop22h 18m
Multiple Airlines
Deal found 7/17![Multiple Airlines logo]()
$510
This Southwest deal was found by Cheapflights users on 7/17. 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 8/15:10 am
SAT
- ISP
1 stop5h 25m
Southwest
Wed 8/510:55 am
ISP
- SAT
1 stop8h 05m
Southwest
Deal found 7/17![Southwest logo]()
$587
This Gotogate deal was found by Cheapflights users on 7/17. 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.
Sat 8/15:38 pm
SAT
- ISP
3 stops23h 28m
Breeze Airways
Wed 8/57:41 pm
ISP
- SAT
3 stops40h 09m
Breeze Airways
Deal found 7/17![Breeze Airways logo]()
$1,133
One-way flights from San Antonio to IslipSearch for one-way flight options from San Antonio to Islip. Find affordable one-way fares based on user searches. Data last updated July 18, 2026.
Search for one-way flight options from San Antonio to Islip. Find affordable one-way fares based on user searches. Data last updated July 18, 2026.
This Frontier deal was found by Cheapflights users on 7/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/219:51 am
SAT
- ISP
1 stop7h 23m
Frontier
Deal found 7/13![Frontier logo]()
$154
This Southwest deal was found by Cheapflights users on 7/13. 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 9/112:55 pm
SAT
- ISP
1 stop6h 10m
Southwest
Deal found 7/13![Southwest logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 7/16. 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.
Thu 8/69:32 pm
SAT
- ISP
2 stops35h 21m
Frontier
Deal found 7/16![Frontier logo]()
$249
This Kiwi.com deal was found by Cheapflights users on 7/13. 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 9/119:57 am
SAT
- ISP
3 stops24h 23m
Multiple Airlines
Deal found 7/13![Multiple Airlines logo]()
$251
This Kiwi.com deal was found by Cheapflights users on 7/16. 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.
Thu 8/69:55 am
SAT
- ISP
1 stop26h 33m
Breeze Airways
Deal found 7/16![Breeze Airways logo]()
$278
This Kiwi.com deal was found by Cheapflights users on 7/16. 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.
Thu 8/69:32 pm
SAT
- ISP
3 stops36h 45m
Multiple Airlines
Deal found 7/16![Multiple Airlines logo]()
$283
This KAYAK deal was found by Cheapflights users on 7/16. 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 11/2012:38 pm
SAT
- ISP
2 stops21h 42m
Breeze Airways
Deal found 7/16![Breeze Airways logo]()
$355
This KAYAK deal was found by Cheapflights users on 7/16. 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 8/139:55 am
SAT
- ISP
1 stop26h 33m
Breeze Airways
Deal found 7/16![Breeze Airways logo]()
$360
This KAYAK deal was found by Cheapflights users on 7/13. 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 8/2111:30 am
SAT
- ISP
2 stops22h 47m
Breeze Airways
Deal found 7/13![Breeze Airways logo]()
$385
Find flight deals from San Antonio to Islip
Discover tips and strategies to find the most affordable flight options for your journey from San Antonio (SAT) to Islip (ISP). 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 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $363 (Southwest) |
One-way from | $154 (Frontier) |
Popular in | July |
Cheapest in | September |
Average price | $418 |
Cheapflights Fare Finder
Customize your flight search to find flights from San Antonio to Islip 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 18, 2026.
Use the filters below to find and compare flights from San Antonio to Islip that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Wed 9/16
11:30 am-9:05 pm
2 stops8h 35m
Islip Long Island
Mon 9/21
4:05 pm-9:30 pm
1 stop6h 25m
$368
Quickest round-trip
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Thu 9/3
2:55 pm-10:05 pm
1 stop6h 10m
Islip Long Island
Tue 9/8
6:05 am-11:00 am
1 stop5h 55m
$372
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Wed 9/2
10:50 am-9:05 pm
2 stops9h 15m
Islip Long Island
Sun 9/6
4:15 pm-11:20 pm
2 stops8h 05m
$373
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Fri 9/11
2:55 pm-10:05 pm
1 stop6h 10m
Islip Long Island
Sun 9/13
4:35 pm-9:40 pm
1 stop6h 05m
$415
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Thu 9/3
12:20 pm-10:05 pm
2 stops8h 45m
Islip Long Island
Mon 9/7
6:10 am-2:15 pm
2 stops9h 05m
$434
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Sat 8/1
9:32 pm-7:01 pm
2 stops44h 29m
Islip Long Island
Wed 8/5
11:57 am-9:15 am
1 stop22h 18m
$510
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Sat 8/1
5:10 am-11:35 am
1 stop5h 25m
Islip Long Island
Wed 8/5
10:55 am-6:00 pm
1 stop8h 05m
$587
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Fri 7/31
3:40 pm-11:40 pm
2 stops7h 00m
Islip Long Island
Tue 8/4
3:20 pm-11:05 pm
2 stops8h 45m
$597
Cheapest one-way
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Fri 8/21
9:51 am-6:14 pm
1 stop7h 23m
$154
Quickest one-way
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Fri 9/11
2:55 pm-10:05 pm
1 stop6h 10m
$182
Showing 1-10 of 17 resultsSorted by cheapest first
- Most accurate provider: When it comes to deals on San Antonio-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Antonio-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Antonio-Islip, New York flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on San Antonio-Islip, New York 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 San Antonio-Islip, New York 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 San Antonio to Islip
Have a flexible travel schedule? Discover the best time to fly to Islip from San Antonio with our price prediction graph.
SAT-ISP
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 Islip
Get insights into the airlines that provide service to Islip. 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 Islip. Reviews last updated July 18, 2026.
Read through reviews of airlines operating flights from San Antonio to Islip, such as Southwest. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Overall
8.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Related info for your journey
Find useful and relevant information for your journey from San Antonio to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Book flights to Islip if you plan to visit one of these locationsRiverhead
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Top airline flying from San Antonio to Islip
Discover the top airline that operate flights from San Antonio to Islip. 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 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$309 | Average$456 | FlexibilityNo cancel fee | On-time63% |