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$122+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAT
Mar 21 — Mar 281
Sat 3/21
Sat 3/28
1 adult, Economy
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Cheap flight deals from Islip to San Antonio

Cheapest flights from Islip to San Antonio
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 February 19, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/17. 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.
Thu 3/53:34 pm
ISP
-
SAT
1 stop9h 25m
Multiple Airlines
Tue 3/102:13 pm
SAT
-
ISP
2 stops19h 57m
Multiple Airlines
Deal found 2/17$331
This Kiwi.com deal was found by Cheapflights users on 2/18. 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.
Fri 3/61:42 pm
ISP
-
SAT
1 stop11h 17m
Multiple Airlines
Tue 3/102:13 pm
SAT
-
ISP
2 stops19h 57m
Multiple Airlines
Deal found 2/18$353
This Southwest deal was found by Cheapflights users on 2/17. 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.
Tue 4/146:30 am
ISP
-
SAT
1 stop7h 20m
Southwest
Tue 6/25:45 am
SAT
-
ISP
1 stop5h 10m
Southwest
Deal found 2/17$377
This Kiwi.com deal was found by Cheapflights users on 2/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/23:34 pm
ISP
-
SAT
1 stop9h 25m
Multiple Airlines
Fri 3/63:46 pm
SAT
-
ISP
2 stops18h 24m
Multiple Airlines
Deal found 2/15$380
This Kiwi.com deal was found by Cheapflights users on 2/17. 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.
Sun 4/57:26 pm
ISP
-
SAT
2 stops39h 01m
Multiple Airlines
Sun 5/319:55 am
SAT
-
ISP
1 stop26h 33m
Multiple Airlines
Deal found 2/17$403
This Kiwi.com deal was found by Cheapflights users on 2/17. 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.
Sun 4/512:08 pm
ISP
-
SAT
2 stops22h 19m
Multiple Airlines
Mon 4/61:22 pm
SAT
-
ISP
1 stop8h 52m
Multiple Airlines
Deal found 2/17$437
This Southwest deal was found by Cheapflights users on 2/17. 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.
Thu 3/55:55 pm
ISP
-
SAT
1 stop6h 05m
Southwest
Tue 3/105:25 am
SAT
-
ISP
1 stop5h 15m
Southwest
Deal found 2/17$467
This Southwest deal was found by Cheapflights users on 2/17. 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.
Sun 4/512:20 pm
ISP
-
SAT
1 stop6h 55m
Southwest
Mon 4/65:00 am
SAT
-
ISP
1 stop5h 40m
Southwest
Deal found 2/17$471

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 February 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$331
(Kiwi.com)

One-way from

$122
(Priceline)

Popular in

December

Cheapest in

September

Average price

$466
Provider with most accurate pricing for Islip Long Island-San Antonio flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-San Antonio flights.
Search Deals
From Islip Long Island to San Antonio
Search Deals
One-way flight from Islip Long Island to San Antonio
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($48 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 19, 2026.
Use the filters below to find and compare flights from Islip to San Antonio that are best for you.

Fly from

Islip

Fly to

San Antonio

Route

Depart

Return

Price

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Thu 3/5

3:34 pm-11:59 pm

1 stop9h 25m

San Antonio

Tue 3/10

2:13 pm-11:10 am

2 stops19h 57m

$331

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 3/6

1:42 pm-11:59 pm

1 stop11h 17m

San Antonio

Tue 3/10

2:13 pm-11:10 am

2 stops19h 57m

$353

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 4/14

6:30 am-12:50 pm

1 stop7h 20m

San Antonio

Tue 6/2

5:45 am-11:55 am

1 stop5h 10m

$377

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Mon 3/2

3:34 pm-11:59 pm

1 stop9h 25m

San Antonio

Fri 3/6

3:46 pm-11:10 am

2 stops18h 24m

$380

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Sun 4/5

7:26 pm-9:27 am

2 stops39h 01m

San Antonio

Sun 5/31

9:55 am-1:28 pm

1 stop26h 33m

$403

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Sun 4/5

12:08 pm-9:27 am

2 stops22h 19m

San Antonio

Mon 4/6

1:22 pm-11:14 pm

1 stop8h 52m

$437

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Sun 4/5

12:20 pm-6:15 pm

1 stop6h 55m

San Antonio

Mon 4/6

5:00 am-11:40 am

1 stop5h 40m

$471

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Thu 3/5

6:00 am-2:25 pm

2 stops9h 25m

San Antonio

Tue 3/10

6:20 am-4:05 pm

2 stops8h 45m

$553

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Wed 4/8

6:30 am-12:50 pm

1 stop7h 20m

San Antonio

Sat 4/11

5:15 am-1:10 pm

1 stop6h 55m

$557

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Sun 3/1

8:33 am-7:29 pm

1 stop11h 56m

$122

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/16

Showing 1-10 of 17 results
1
2

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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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.

Cheapflights Insights

Everything you need to know about your flight from Islip to San Antonio

What is the cheapest month to book a flight from Islip, New York to San Antonio?

Currently, December is the cheapest month in which you can book a flight from Islip, New York to San Antonio (average of $56). Flying from Islip, New York to San Antonio in September is currently the most expensive (average of $163). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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 February 19, 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.
Southwest
8.0
Very good
4,295 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,295 reviews
Southwest
8.0
Very good
4,295 reviews

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • How long is the flight from Islip, New York to San Antonio?

    A quick flight from Islip, New York to San Antonio can take about 7h 20m. Southwest provides one of the quickest options available for as low as $377. The distance between Islip, New York and San Antonio is about 1621 mi.

  • What is the cheapest airline to fly from Islip, New York to San Antonio round-trip?

    Currently priced at $313, Southwest will fly you from Islip, New York to San Antonio and back. In addition to Southwest, many other airlines offer competitively priced options for your trip.

  • Can I find deals for flights from Islip to San Antonio that include hotel bookings?

    Yes. In addition to deals on Islip to San Antonio flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to San Antonio?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to San Antonio.

  • Can I find deals for business class flights from Islip to San Antonio?

    Yes. Cheapflights offers flight deals from Islip to San Antonio by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Islip, New York to San Antonio?

    Currently, December is the cheapest month in which you can book a flight from Islip, New York to San Antonio (average of $56). Flying from Islip, New York to San Antonio in September is currently the most expensive (average of $163). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Kerrville

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Alternative routes for Islip to San Antonio

See prices for flight routes from nearby airports that may be better suited for you.
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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 February 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$313Average$466FlexibilityNo cancel feeOn-time63%

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