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Islip

$129+ Cheap flights from San Antonio to Islip, NY (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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ISP
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$346
(Southwest)

One-way from

$129
(Frontier)

Popular in

December

Cheapest in

September

Average price

$326
From San Antonio to Islip Long Island
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One-way flight from San Antonio to Islip Long Island
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Highest demand for flights based on searches. 10% potential increase in price ($38 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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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 July 29, 2025.

This Southwest deal was found by Cheapflights users on 7/28. 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.
Sat 9/65:05 amSAT - ISP
1 stop6h 00mSouthwest
Mon 9/83:05 pmISP - SAT
1 stop8h 00mSouthwest
Deal found 7/28$346

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 July 29, 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

Sat 9/6

5:05 am-12:05 pm

1 stop6h 00m

Islip Long Island

Mon 9/8

3:05 pm-10:05 pm

1 stop8h 00m

$346

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Fri 8/15

10:16 am-7:42 pm

1 stop8h 26m

$129

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Fri 8/15

2:25 pm-10:55 pm

2 stops7h 30m

$304

San AntonioIslip

SAT - ISP

SATISP

San Antonio

Fri 8/8

9:00 am-1:32 pm

3 stops27h 32m

$389

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

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, New York?

Currently, January is the cheapest month in which you can book a flight from San Antonio to Islip, New York (average of $108). Flying from San Antonio to Islip, New York 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 July 29, 2025.
Read through reviews of airlines operating flights from San Antonio to Islip, such as Southwest and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

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
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

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.
Frontier
5.9
Fair
3,238 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

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.

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

    According to our current data, Southwest ($346), offers the cheapest pricing from San Antonio to Islip, New York.

  • 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, New York?

    Currently, January is the cheapest month in which you can book a flight from San Antonio to Islip, New York (average of $108). Flying from San Antonio to Islip, New York 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

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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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$314Average$426FlexibilityNo cancel feeOn-time63%

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