HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Antonio

$145+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAT
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
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

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 January 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$393
(Southwest)

One-way from

$145
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$443
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. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 8, 2026.

This Southwest deal was found by Cheapflights users on 1/6. 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 2/312:40 pmISP - SAT
1 stop9h 30mSouthwest
Thu 2/53:40 pmSAT - ISP
1 stop5h 40mSouthwest
Deal found 1/6$393
This Kiwi.com deal was found by Cheapflights users on 1/7. 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 1/88:40 pmISP - SAT
1 stop28h 12mMultiple Airlines
Sun 1/117:14 pmSAT - ISP
1 stop23h 37mMultiple Airlines
Deal found 1/7$568
This Mytrip deal was found by Cheapflights users on 1/6. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/219:59 amISP - SAT
2 stops14h 53mMultiple Airlines
Sun 1/2510:35 amSAT - ISP
3 stops32h 19mMultiple Airlines
Deal found 1/6$696
This Southwest deal was found by Cheapflights users on 1/7. 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 1/86:00 amISP - SAT
2 stops11h 05mSouthwest
Sun 1/115:50 amSAT - ISP
2 stops9h 45mSouthwest
Deal found 1/7$1,088

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 January 8, 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

Tue 2/3

12:40 pm-9:10 pm

1 stop9h 30m

San Antonio

Thu 2/5

3:40 pm-10:20 pm

1 stop5h 40m

$393

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Wed 1/21

9:59 am-11:52 pm

2 stops14h 53m

San Antonio

Sun 1/25

10:35 am-7:54 pm

3 stops32h 19m

$696

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Thu 1/22

7:26 pm-9:40 am

2 stops39h 14m

$145

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 3/6

1:42 pm-11:59 pm

1 stop11h 17m

$150

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 3/6

1:42 pm-9:06 am

2 stops20h 24m

$160

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

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 January.
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, 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 February is currently the most expensive (average of $183). 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 January 8, 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
4,250 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

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
4,250 reviews
Southwest
8.0
Very good
4,250 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

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 9h 30m. Southwest provides one of the quickest options available for as low as $393. 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 February is currently the most expensive (average of $183). 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

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 for Islip to San Antonio

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Dallas/Fort Worth flights
LaGuardia to Dallas/Fort Worth flights
LaGuardia to Hobby flights
John F Kennedy Intl to Hobby flights
Newark to Hobby flights
John F Kennedy Intl to George Bush Intcntl flights
Newark to Dallas/Fort Worth flights
Newark to George Bush Intcntl flights
John F Kennedy Intl to Austin flights
Newark to Austin flights
LaGuardia to George Bush Intcntl flights
LaGuardia to Austin flights
LaGuardia to Love Field flights
Newark to San Antonio flights
John F Kennedy Intl to San Antonio flights
Newark to Love Field flights
John F Kennedy Intl to Love Field flights
LaGuardia to San Antonio flights
Buffalo to Dallas/Fort Worth flights
Syracuse to Dallas/Fort Worth flights
Rochester to Hobby flights
Rochester to Dallas/Fort Worth flights
Buffalo to Hobby flights
John F Kennedy Intl to El Paso flights
Rochester to George Bush Intcntl flights
Newark to El Paso flights
Islip to Dallas/Fort Worth flights
Albany to Dallas/Fort Worth flights
LaGuardia to El Paso flights
Buffalo to George Bush Intcntl flights
Stewart to Dallas/Fort Worth flights
Buffalo to Love Field flights
Syracuse to Hobby flights
White Plains to Dallas/Fort Worth flights
Albany to Austin flights
White Plains to Hobby flights
White Plains to Austin flights
Rochester to Love Field flights
White Plains to George Bush Intcntl flights
Albany to Hobby flights
Newark to McAllen flights
Albany to Love Field flights
LaGuardia to Midland flights
Syracuse to George Bush Intcntl flights
Buffalo to San Antonio flights
Syracuse to Austin flights
Rochester to San Antonio flights
Stewart to George Bush Intcntl flights
Rochester to Austin flights
John F Kennedy Intl to Midland flights

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 January 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$313Average$446FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.