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$206+ 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 11/25. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAT
Dec 20 — Dec 271
Sat 12/20
Sat 12/27
1 adult, Economy
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Cheap 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 November 20, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$234
(Trip.com)

One-way from

$206
(Frontier)

Popular in

December

Cheapest in

September

Average price

$458
Provider with most accurate pricing for Islip Long Island-San Antonio flight deals.
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Provider most trusted by Cheapflights users for Islip Long Island-San Antonio flights.
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From Islip Long Island to San Antonio
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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).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find 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 November 20, 2025.

This Trip.com deal was found by Cheapflights users on 11/18. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/36:00 amISP - SAT
2 stops33h 11mFrontier
Sun 12/78:50 amSAT - ISP
1 stop23h 23mFrontier
Deal found 11/18$234
This Trip.com deal was found by Cheapflights users on 11/19. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/410:19 amISP - SAT
2 stops33h 41mFrontier
Mon 12/87:43 pmSAT - ISP
2 stops22h 51mFrontier
Deal found 11/19$259
This Kiwi.com deal was found by Cheapflights users on 11/18. 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 12/36:00 amISP - SAT
1 stop27h 15mMultiple Airlines
Sun 12/73:10 pmSAT - ISP
1 stop17h 03mMultiple Airlines
Deal found 11/18$264
This Trip.com deal was found by Cheapflights users on 11/19. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/410:19 amISP - SAT
2 stops14h 07mMultiple Airlines
Mon 12/83:10 pmSAT - ISP
1 stop27h 24mMultiple Airlines
Deal found 11/19$280
This Southwest deal was found by Cheapflights users on 11/18. 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.
Sun 12/285:50 pmISP - SAT
1 stop7h 25mSouthwest
Fri 1/25:40 amSAT - ISP
1 stop10h 35mSouthwest
Deal found 11/18$612
This Kiwi.com deal was found by Cheapflights users on 11/18. 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 11/2811:32 amISP - SAT
1 stop29h 27mMultiple Airlines
Fri 1/25:56 pmSAT - ISP
2 stops39h 02mMultiple Airlines
Deal found 11/18$662
This Southwest deal was found by Cheapflights users on 11/18. 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.
Fri 11/285:50 amISP - SAT
1 stop7h 40mSouthwest
Fri 1/25:40 amSAT - ISP
1 stop10h 35mSouthwest
Deal found 11/18$737

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 November 20, 2025.
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

Wed 12/3

6:00 am-2:11 pm

2 stops33h 11m

San Antonio

Sun 12/7

8:50 am-9:13 am

1 stop23h 23m

$234

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Thu 12/4

10:19 am-7:00 pm

2 stops33h 41m

San Antonio

Mon 12/8

7:43 pm-7:34 pm

2 stops22h 51m

$259

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 1/6

12:00 pm-5:35 am

2 stops18h 35m

San Antonio

Wed 3/4

6:00 am-9:47 am

1 stop26h 47m

$263

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Wed 12/3

6:00 am-8:15 am

1 stop27h 15m

San Antonio

Sun 12/7

3:10 pm-9:13 am

1 stop17h 03m

$264

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Sun 1/25

9:25 am-11:52 pm

1 stop15h 27m

San Antonio

Sun 2/1

6:30 am-1:21 pm

2 stops29h 51m

$281

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 1/9

2:01 pm-3:00 pm

2 stops25h 59m

San Antonio

Mon 1/12

6:30 am-7:51 pm

1 stop12h 21m

$362

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 1/6

3:45 pm-9:10 pm

1 stop6h 25m

San Antonio

Wed 3/4

5:45 am-11:55 am

1 stop5h 10m

$367

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 1/9

12:40 pm-9:10 pm

1 stop9h 30m

San Antonio

Mon 1/12

5:45 am-11:55 am

1 stop5h 10m

$420

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 11/25

11:03 am-6:16 pm

1 stop8h 13m

$206

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/18

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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-San Antonio flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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, January is the cheapest month in which you can book a flight from Islip, New York to San Antonio (average of $98). Flying from Islip, New York to San Antonio in February 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 November 20, 2025.
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
4,251 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.1

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
4,251 reviews
Southwest
8.0
Very good
4,251 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.1

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 33h 11m. Frontier provides one of the quickest options available for as low as $234. 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 $350, 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, January is the cheapest month in which you can book a flight from Islip, New York to San Antonio (average of $98). Flying from Islip, New York to San Antonio in February 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 November 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$350Average$492FlexibilityNo cancel feeOn-time63%

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