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$146+ Cheap flights from Islip 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
Nov 1 — Nov 81
Sat 11/1
Sat 11/8
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 October 2, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$269
(Kiwi.com)

One-way from

$146
(Cheapflightsfares)

Popular in

December

Cheapest in

October

Average price

$308
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
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Highest demand for flights based on searches. 8% potential increase in price ($37 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 October 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 October 2, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/1. 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 11/2010:02 amISP - SAT
1 stop9h 40mMultiple Airlines
Sun 11/238:33 pmSAT - ISP
1 stop10h 29mMultiple Airlines
Deal found 10/1$269
This Southwest deal was found by Cheapflights users on 10/1. 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 11/35:40 amISP - SAT
1 stop8h 25mSouthwest
Wed 11/55:45 amSAT - ISP
1 stop5h 30mSouthwest
Deal found 10/1$307
This Southwest deal was found by Cheapflights users on 10/2. 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 10/245:35 pmISP - SAT
1 stop6h 50mSouthwest
Wed 10/295:35 amSAT - ISP
1 stop5h 50mSouthwest
Deal found 10/2$347
This Southwest deal was found by Cheapflights users on 10/1. 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 11/205:40 amISP - SAT
1 stop8h 25mSouthwest
Sun 11/232:15 pmSAT - ISP
2 stops8h 35mSouthwest
Deal found 10/1$392
This Kiwi.com deal was found by Cheapflights users on 10/1. 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 10/179:49 amISP - SAT
2 stops9h 41mMultiple Airlines
Mon 10/204:55 pmSAT - ISP
1 stop26h 47mMultiple Airlines
Deal found 10/1$420
This Southwest deal was found by Cheapflights users on 10/1. 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 10/311:30 pmISP - SAT
1 stop7h 30mSouthwest
Sun 11/25:25 pmSAT - ISP
1 stop5h 25mSouthwest
Deal found 10/1$437

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 October 2, 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

Mon 11/3

5:40 am-1:05 pm

1 stop8h 25m

San Antonio

Wed 11/5

5:45 am-12:15 pm

1 stop5h 30m

$307

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 10/24

5:35 pm-11:25 pm

1 stop6h 50m

San Antonio

Wed 10/29

5:35 am-12:25 pm

1 stop5h 50m

$347

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Thu 11/20

5:40 am-1:05 pm

1 stop8h 25m

San Antonio

Sun 11/23

2:15 pm-11:50 pm

2 stops8h 35m

$392

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 10/17

9:49 am-6:30 pm

2 stops9h 41m

San Antonio

Mon 10/20

4:55 pm-8:42 pm

1 stop26h 47m

$420

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 10/31

1:30 pm-8:00 pm

1 stop7h 30m

San Antonio

Sun 11/2

5:25 pm-11:50 pm

1 stop5h 25m

$437

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 11/25

11:03 am-6:16 pm

1 stop8h 13m

$146

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Mon 11/3

4:58 pm-10:03 am

1 stop18h 05m

$158

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Mon 11/3

6:15 am-2:30 pm

2 stops9h 15m

$251

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Sun 12/28

10:16 am-5:38 pm

1 stop8h 22m

$479

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/1

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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
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-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-San Antonio flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip-San Antonio flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip-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-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 to San Antonio?

Currently, August is the cheapest month in which you can book a flight from Islip to San Antonio (average of $295). Flying from Islip to San Antonio in March is currently the most expensive (average of $376). 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 October 2, 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
4,248 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

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 to San Antonio?

    For as low as $307, Southwest can have you in San Antonio from Islip in 8h 25m. The distance from Islip to San Antonio is about 1621 mi.

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

    Cheapflights users have booked flights from Islip to San Antonio round-trip from $350.

  • 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 to San Antonio?

    Currently, August is the cheapest month in which you can book a flight from Islip to San Antonio (average of $295). Flying from Islip to San Antonio in March is currently the most expensive (average of $376). 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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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 October 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$350Average$462FlexibilityNo cancel feeOn-time63%

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