HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$210+ Cheap flights from San Antonio to Islip (SAT - ISP)

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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ISP
Oct 14 — Oct 211
Tue 10/14
Tue 10/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Antonio to Islip 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 San Antonio to Islip

Discover tips and strategies to find the most affordable flight options for your journey from San Antonio (SAT) to Islip (ISP). 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 September 14, 2025.

Round-trip from

$319
(Cheapflightsfares)

One-way from

$210
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$279
From San Antonio to Islip Long Island
Search Deals
One-way flight from San Antonio to Islip Long Island
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from San Antonio to Islip

Cheapest flights from San Antonio to Islip
Explore the most affordable flight options available from San Antonio to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 14, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/138:38 pmSAT - ISP
2 stops11h 16mFrontier
Sun 11/168:49 amISP - SAT
2 stops11h 41mFrontier
Deal found 9/12$319
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:43 pmSAT - ISP
2 stops11h 26mFrontier
Sun 11/28:49 amISP - SAT
2 stops11h 41mFrontier
Deal found 9/13$333
This Southwest deal was found by Cheapflights users on 9/14. 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 9/165:35 amSAT - ISP
1 stop5h 20mSouthwest
Wed 9/1712:30 pmISP - SAT
1 stop8h 40mSouthwest
Deal found 9/14$1,047
This United deal was found by Cheapflights users on 9/14. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/168:55 amSAT - ISP
3 stops27h 29mMultiple Airlines
Wed 9/174:33 pmISP - SAT
2 stops24h 45mMultiple Airlines
Deal found 9/14$1,520

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Antonio to Islip 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 September 14, 2025.
Use the filters below to find and compare flights from San Antonio to Islip that are best for you.

Fly from

San Antonio

Fly to

Islip

Route

Depart

Return

Price

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Thu 11/13

8:38 pm-8:54 am

2 stops11h 16m

Islip Long Island

Sun 11/16

8:49 am-7:30 pm

2 stops11h 41m

$319

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Thu 10/30

8:43 pm-9:09 am

2 stops11h 26m

Islip Long Island

Sun 11/2

8:49 am-7:30 pm

2 stops11h 41m

$333

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Sat 10/11

2:04 pm-8:52 pm

3 stops29h 48m

$210

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Tue 9/30

9:47 pm-10:40 am

3 stops59h 53m

$251

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Sat 10/11

5:50 am-12:10 pm

1 stop5h 20m

$260

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Tue 9/30

1:10 pm-10:05 pm

1 stop7h 55m

$274

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Best time to book a flight from San Antonio to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from San Antonio 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 San Antonio to Islip

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

Currently, January is the cheapest month in which you can book a flight from San Antonio to Islip (average of $108). Flying from San Antonio to Islip in November is currently the most expensive (average of $213). 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 Islip

Get insights into the airlines that provide service to Islip. 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 Islip. Reviews last updated September 14, 2025.
Read through reviews of airlines operating flights from San Antonio to Islip, 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
4,245 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.0
Very good
4,245 reviews
Southwest
8.0
Very good
4,245 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from San Antonio to Islip. 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 San Antonio to Islip?

    Frontier can get you from San Antonio to Islip in just under 11h 16m. Your travel time can differ by up to . There are 1621 mi between San Antonio and Islip.

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

    Southwest, at $309, was found to be the cheapest airline from San Antonio to Islip..

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

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

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

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

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

    Yes. Cheapflights offers flight deals from San Antonio to Islip 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 San Antonio to Islip?

    Currently, January is the cheapest month in which you can book a flight from San Antonio to Islip (average of $108). Flying from San Antonio to Islip in November is currently the most expensive (average of $213). 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 Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
Southampton

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 San Antonio to Islip

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

Top airline flying from San Antonio to Islip

Discover the top airline that operate flights from San Antonio to Islip. 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 September 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$309Average$426FlexibilityNo 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.