$190+ 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 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAT
Jun 25 — Jul 21
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Cheapest
Best
Last-minute
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 May 26, 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 May 26, 2026.
This Southwest deal was found by Cheapflights users on 5/24. 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 6/166:00 am
ISP
- SAT
1 stop5h 45m
Southwest
Tue 6/163:15 pm
SAT
- ISP
1 stop6h 20m
Southwest
Deal found 5/24![Southwest logo]()
$395
This Southwest deal was found by Cheapflights users on 5/24. 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 6/176:00 am
ISP
- SAT
1 stop5h 45m
Southwest
Wed 6/173:15 pm
SAT
- ISP
1 stop6h 20m
Southwest
Deal found 5/24![Southwest logo]()
$467
This Southwest deal was found by Cheapflights users on 5/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/56:05 pm
ISP
- SAT
1 stop6h 45m
Southwest
Tue 6/912:05 pm
SAT
- ISP
1 stop9h 30m
Southwest
Deal found 5/21![Southwest logo]()
$587
This KAYAK deal was found by Cheapflights users on 5/24. 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 7/142:08 pm
ISP
- SAT
3 stops27h 05m
Breeze Airways
Fri 7/2411:30 am
SAT
- ISP
2 stops22h 47m
Breeze Airways
Deal found 5/24![Breeze Airways logo]()
$964
This Southwest deal was found by Cheapflights users on 5/22. 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.
Mon 6/16:00 am
ISP
- SAT
1 stop7h 15m
Southwest
Tue 6/25:45 am
SAT
- ISP
1 stop5h 10m
Southwest
Deal found 5/22![Southwest logo]()
$977
This KAYAK deal was found by Cheapflights users on 5/25. 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 7/72:08 pm
ISP
- SAT
3 stops27h 05m
Breeze Airways
Fri 7/1011:30 am
SAT
- ISP
2 stops22h 47m
Breeze Airways
Deal found 5/25![Breeze Airways logo]()
$1,044
This Southwest deal was found by Cheapflights users on 5/25. 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 5/296:00 am
ISP
- SAT
1 stop7h 15m
Southwest
Sun 5/315:15 am
SAT
- ISP
1 stop5h 35m
Southwest
Deal found 5/25![Southwest logo]()
$1,157
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 May 26, 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 May 26, 2026.
This Southwest deal was found by Cheapflights users on 5/24. 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 6/166:00 am
ISP
- SAT
1 stop5h 45m
Southwest
Tue 6/163:15 pm
SAT
- ISP
1 stop6h 20m
Southwest
Deal found 5/24![Southwest logo]()
$395
This Southwest deal was found by Cheapflights users on 5/24. 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 6/176:00 am
ISP
- SAT
1 stop5h 45m
Southwest
Wed 6/173:15 pm
SAT
- ISP
1 stop6h 20m
Southwest
Deal found 5/24![Southwest logo]()
$467
This KAYAK deal was found by Cheapflights users on 5/24. 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 7/142:08 pm
ISP
- SAT
3 stops27h 05m
Breeze Airways
Fri 7/2411:30 am
SAT
- ISP
2 stops22h 47m
Breeze Airways
Deal found 5/24![Breeze Airways logo]()
$964
This Southwest deal was found by Cheapflights users on 5/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/56:05 pm
ISP
- SAT
1 stop6h 45m
Southwest
Tue 6/912:05 pm
SAT
- ISP
1 stop9h 30m
Southwest
Deal found 5/21![Southwest logo]()
$587
Last-minute flights from Islip to San AntonioDiscover last-minute flight deals from Islip to San Antonio. Data last updated May 26, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Antonio. Data last updated May 26, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 5/25. 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 5/296:00 am
ISP
- SAT
1 stop7h 15m
Southwest
Sun 5/315:15 am
SAT
- ISP
1 stop5h 35m
Southwest
Deal found 5/25![Southwest logo]()
$1,157
This Southwest deal was found by Cheapflights users on 5/22. 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.
Mon 6/16:00 am
ISP
- SAT
1 stop7h 15m
Southwest
Tue 6/25:45 am
SAT
- ISP
1 stop5h 10m
Southwest
Deal found 5/22![Southwest logo]()
$977
This Southwest deal was found by Cheapflights users on 5/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/56:05 pm
ISP
- SAT
1 stop6h 45m
Southwest
Tue 6/912:05 pm
SAT
- ISP
1 stop9h 30m
Southwest
Deal found 5/21![Southwest logo]()
$587
This Southwest deal was found by Cheapflights users on 5/24. 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 6/166:00 am
ISP
- SAT
1 stop5h 45m
Southwest
Tue 6/163:15 pm
SAT
- ISP
1 stop6h 20m
Southwest
Deal found 5/24![Southwest logo]()
$395
This Southwest deal was found by Cheapflights users on 5/24. 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 6/176:00 am
ISP
- SAT
1 stop5h 45m
Southwest
Wed 6/173:15 pm
SAT
- ISP
1 stop6h 20m
Southwest
Deal found 5/24![Southwest logo]()
$467
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 May 26, 2026.
Search for one-way flight options from Islip to San Antonio. Find affordable one-way fares based on user searches. Data last updated May 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/25. 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 6/311:57 am
ISP
- SAT
1 stop22h 18m
Breeze Airways
Deal found 5/25![Breeze Airways logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 5/25. 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 6/611:57 am
ISP
- SAT
1 stop22h 18m
Breeze Airways
Deal found 5/25![Breeze Airways logo]()
$213
This Kiwi.com deal was found by Cheapflights users on 5/25. 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 6/311:57 am
ISP
- SAT
3 stops47h 53m
Multiple Airlines
Deal found 5/25![Multiple Airlines logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 5/24. 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 6/97:18 pm
ISP
- SAT
2 stops21h 55m
Breeze Airways
Deal found 5/24![Breeze Airways logo]()
$249
This Southwest deal was found by Cheapflights users on 5/24. 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 5/24![Southwest logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 5/24. 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 6/811:00 am
ISP
- SAT
2 stops32h 56m
Frontier
Deal found 5/24![Frontier logo]()
$280
This Kiwi.com deal was found by Cheapflights users on 5/25. 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 6/611:57 am
ISP
- SAT
3 stops56h 02m
Multiple Airlines
Deal found 5/25![Multiple Airlines logo]()
$286
This Southwest deal was found by Cheapflights users on 5/24. 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 6/912:25 pm
ISP
- SAT
1 stop6h 30m
Southwest
Deal found 5/24![Southwest logo]()
$294
This Kiwi.com deal was found by Cheapflights users on 5/24. 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 6/1011:57 am
ISP
- SAT
3 stops33h 14m
Multiple Airlines
Deal found 5/24![Multiple Airlines logo]()
$307
This Kiwi.com deal was found by Cheapflights users on 5/25. 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 6/52:28 pm
ISP
- SAT
3 stops29h 31m
Multiple Airlines
Deal found 5/25![Multiple Airlines logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 5/24. 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 7/265:50 pm
ISP
- SAT
3 stops50h 04m
Multiple Airlines
Deal found 5/24![Multiple Airlines logo]()
$328
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 May 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $395 (Southwest) |
One-way from | $190 (Kiwi.com) |
Popular in | March |
Cheapest in | September |
Average price | $457 |
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 May 26, 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 - SAT
ISPSAT
Islip Long Island
Tue 6/16
6:00 am-10:45 am
1 stop5h 45m
San Antonio
Tue 6/16
3:15 pm-10:35 pm
1 stop6h 20m
$395
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Wed 6/17
6:00 am-10:45 am
1 stop5h 45m
San Antonio
Wed 6/17
3:15 pm-10:35 pm
1 stop6h 20m
$467
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Fri 6/5
6:05 pm-11:50 pm
1 stop6h 45m
San Antonio
Tue 6/9
12:05 pm-10:35 pm
1 stop9h 30m
$587
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Tue 7/14
2:08 pm-4:13 pm
3 stops27h 05m
San Antonio
Fri 7/24
11:30 am-11:17 am
2 stops22h 47m
$964
Cheapest one-way
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Tue 6/9
7:18 pm-4:13 pm
2 stops21h 55m
$249
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Sun 7/26
5:55 pm-1:15 am
1 stop8h 20m
$270
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Wed 6/10
9:52 pm-6:56 pm
2 stops22h 04m
$280
Quickest one-way
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Tue 6/9
12:25 pm-5:55 pm
1 stop6h 30m
$294
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Mon 6/8
2:28 pm-8:11 pm
3 stops30h 43m
$356
IslipSan Antonio
ISP - SAT
ISPSAT
Islip Long Island
Wed 6/10
7:41 pm-10:50 am
3 stops40h 09m
$601
Sorted 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 May.
| 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 May 26, 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.
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Food
7.0
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
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Islip
Popular flights
San Antonio flight routes
Alternative routes for Islip to San Antonio
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Antonio by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Islip to San Antonio by cabin class
Find flights from Islip to San Antonio, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Islip and San Antonio flights
Browse other Islip and San Antonio flight options. Last updated on May 26, 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 May 26, 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 May 26, 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 2,558,603 searches. Data last updated May 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$300 | Average$402 | FlexibilityNo cancel fee | On-time63% |