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Islip

$351+ Cheap flights from San Antonio to Islip (SAT - ISP)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ISP
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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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 17, 2025.

Round-trip from

$351
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$279
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 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Mon 10/64:55 pmSAT - ISP
1 stop26h 47mMultiple Airlines
Fri 10/312:25 pmISP - SAT
2 stops24h 52mMultiple Airlines
Deal found 9/17$351
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/234:55 pmSAT - ISP
1 stop16h 42mMultiple Airlines
Mon 10/274:58 pmISP - SAT
2 stops31h 42mMultiple Airlines
Deal found 9/16$376
This Southwest deal was found by Cheapflights users on 9/16. 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 10/235:35 amSAT - ISP
2 stops8h 00mSouthwest
Mon 10/275:35 pmISP - SAT
1 stop6h 50mSouthwest
Deal found 9/16$418
This Southwest deal was found by Cheapflights users on 9/17. 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.
Mon 10/61:50 pmSAT - ISP
2 stops8h 55mSouthwest
Fri 10/311:30 pmISP - SAT
2 stops9h 00mSouthwest
Deal found 9/17$527

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 17, 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

Mon 10/6

4:55 pm-8:42 pm

1 stop26h 47m

Islip Long Island

Fri 10/31

2:25 pm-2:17 pm

2 stops24h 52m

$351

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Thu 10/23

4:55 pm-10:37 am

1 stop16h 42m

Islip Long Island

Mon 10/27

4:58 pm-11:40 pm

2 stops31h 42m

$376

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Thu 10/23

5:35 am-2:35 pm

2 stops8h 00m

Islip Long Island

Mon 10/27

5:35 pm-11:25 pm

1 stop6h 50m

$418

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Mon 10/6

1:50 pm-11:45 pm

2 stops8h 55m

Islip Long Island

Fri 10/31

1:30 pm-9:30 pm

2 stops9h 00m

$527

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

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 17, 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
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Food

7.0

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Food

7.0

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?

    Southwest can get you from San Antonio to Islip in just under 8h. 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
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Alternative routes for San Antonio to Islip

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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 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$309Average$426FlexibilityNo cancel feeOn-time63%

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