$176+ 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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ISP
Jul 19 — Jul 261
Round-trip
1 adult, Economy
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Best
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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 June 19, 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 June 19, 2026.
This Frontier deal was found by Cheapflights users on 6/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/179:51 am
SAT
- ISP
1 stop23h 02m
Frontier
Fri 7/2410:57 am
ISP
- SAT
1 stop29h 44m
Frontier
Deal found 6/16![Frontier logo]()
$340
This Southwest deal was found by Cheapflights users on 6/15. 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 7/153:15 pm
SAT
- ISP
1 stop6h 25m
Southwest
Tue 7/214:40 pm
ISP
- SAT
1 stop6h 00m
Southwest
Deal found 6/15![Southwest logo]()
$385
This Southwest deal was found by Cheapflights users on 6/15. 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.
Tue 7/143:15 pm
SAT
- ISP
1 stop6h 25m
Southwest
Mon 7/206:05 pm
ISP
- SAT
1 stop6h 50m
Southwest
Deal found 6/15![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/171:50 pm
SAT
- ISP
2 stops8h 50m
Southwest
Fri 7/245:50 pm
ISP
- SAT
1 stop6h 35m
Southwest
Deal found 6/16![Southwest logo]()
$472
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 June 19, 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 June 19, 2026.
This Southwest deal was found by Cheapflights users on 6/15. 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 7/1512:55 pm
SAT
- ISP
2 stops8h 45m
Southwest
Tue 7/214:40 pm
ISP
- SAT
1 stop6h 00m
Southwest
Deal found 6/15![Southwest logo]()
$390
This Southwest deal was found by Cheapflights users on 6/15. 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.
Tue 7/143:15 pm
SAT
- ISP
1 stop6h 25m
Southwest
Mon 7/206:05 pm
ISP
- SAT
1 stop6h 50m
Southwest
Deal found 6/15![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/171:50 pm
SAT
- ISP
2 stops8h 50m
Southwest
Fri 7/245:50 pm
ISP
- SAT
1 stop6h 35m
Southwest
Deal found 6/16![Southwest logo]()
$472
Last-minute flights from San Antonio to IslipDiscover last-minute flight deals from San Antonio to Islip. Data last updated June 19, 2026 and is based on user searches.
Discover last-minute flight deals from San Antonio to Islip. Data last updated June 19, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 6/15. 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.
Tue 7/143:15 pm
SAT
- ISP
1 stop6h 25m
Southwest
Mon 7/206:05 pm
ISP
- SAT
1 stop6h 50m
Southwest
Deal found 6/15![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 6/15. 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 7/153:15 pm
SAT
- ISP
1 stop6h 25m
Southwest
Tue 7/214:40 pm
ISP
- SAT
1 stop6h 00m
Southwest
Deal found 6/15![Southwest logo]()
$385
This Frontier deal was found by Cheapflights users on 6/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/179:51 am
SAT
- ISP
1 stop23h 02m
Frontier
Fri 7/2410:57 am
ISP
- SAT
1 stop29h 44m
Frontier
Deal found 6/16![Frontier logo]()
$340
This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/171:50 pm
SAT
- ISP
2 stops8h 50m
Southwest
Fri 7/245:50 pm
ISP
- SAT
1 stop6h 35m
Southwest
Deal found 6/16![Southwest logo]()
$472
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 June 19, 2026.
Search for one-way flight options from San Antonio to Islip. Find affordable one-way fares based on user searches. Data last updated June 19, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 10/299:25 am
SAT
- ISP
1 stop27h 57m
Breeze Airways
Deal found 6/18![Breeze Airways logo]()
$176
This Southwest deal was found by Cheapflights users on 6/18. 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 10/265:15 am
SAT
- ISP
1 stop5h 45m
Southwest
Deal found 6/18![Southwest logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 6/16. 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.
Sat 8/15:38 pm
SAT
- ISP
3 stops23h 28m
Breeze Airways
Deal found 6/16![Breeze Airways logo]()
$232
This Southwest deal was found by Cheapflights users on 6/16. 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 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
Deal found 6/16![Southwest logo]()
$234
This Southwest deal was found by Cheapflights users on 6/18. 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 7/185:00 am
SAT
- ISP
2 stops8h 50m
Southwest
Deal found 6/18![Southwest logo]()
$239
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 10/2612:43 pm
SAT
- ISP
3 stops23h 15m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 6/16. 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 6/259:55 am
SAT
- ISP
1 stop26h 33m
Breeze Airways
Deal found 6/16![Breeze Airways logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 7/17:51 pm
SAT
- ISP
2 stops13h 12m
Frontier
Deal found 6/18![Frontier logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 7/187:39 pm
SAT
- ISP
3 stops40h 49m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$311
This KAYAK deal was found by Cheapflights users on 6/15. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:25 am
SAT
- ISP
1 stop27h 57m
Breeze Airways
Deal found 6/15![Breeze Airways logo]()
$330
This KAYAK deal was found by Cheapflights users on 6/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/139:25 am
SAT
- ISP
1 stop27h 57m
Breeze Airways
Deal found 6/19![Breeze Airways logo]()
$340
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 June 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $340 (Frontier) |
One-way from | $176 (Kiwi.com) |
Popular in | March |
Cheapest in | September |
Average price | $389 |
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 June 19, 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 7/15
12:55 pm-10:40 pm
2 stops8h 45m
Islip Long Island
Tue 7/21
4:40 pm-9:40 pm
1 stop6h 00m
$390
Quickest round-trip
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Tue 7/14
3:15 pm-10:40 pm
1 stop6h 25m
Islip Long Island
Mon 7/20
6:05 pm-11:55 pm
1 stop6h 50m
$415
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Fri 7/17
1:50 pm-11:40 pm
2 stops8h 50m
Islip Long Island
Fri 7/24
5:50 pm-11:25 pm
1 stop6h 35m
$472
Cheapest one-way
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Mon 10/26
5:15 am-12:00 pm
1 stop5h 45m
$191
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Thu 10/29
5:00 am-4:00 pm
2 stops10h 00m
$196
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Sat 8/1
5:38 pm-6:06 pm
3 stops23h 28m
$232
Quickest one-way
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Sat 8/1
5:10 am-11:35 am
1 stop5h 25m
$234
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Sat 7/18
5:00 am-2:50 pm
2 stops8h 50m
$239
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Thu 6/25
9:55 am-1:28 pm
1 stop26h 33m
$289
San AntonioIslip
SAT - ISP
SATISP
San Antonio
Wed 7/1
7:51 pm-10:03 am
2 stops13h 12m
$300
Showing 1-10 of 13 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 June 19, 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.
Comfort
8.0
Overall
7.9
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Overall
7.9
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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.
Traveling to a place near Islip?
Book flights to Islip if you plan to visit one of these locationsRiverhead
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Other flights to Islip
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San Antonio and Islip flights
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Other flights from San Antonio
Browse through other flights departing from San Antonio. Flights are based on user searches made on Cheapflights and were last updated on June 19, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 June 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$309 | Average$456 | FlexibilityNo cancel fee | On-time63% |