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$88+ 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 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
SAT — ISP
ene. 14 — ene. 211
mié. 1/14
mié. 1/21
1 adult, Economy
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Cheap 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 diciembre 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
mar. 12/3012:45 pmSAT - ISP
1 stop26h 52mMultiple Airlines
sáb. 1/36:00 amISP - SAT
2 stops24h 37mMultiple Airlines
Deal found 12/15$716
This Southwest deal was found by Cheapflights users on 12/14. 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.
sáb. 12/275:30 pmSAT - ISP
1 stop5h 25mSouthwest
vie. 1/25:50 pmISP - SAT
1 stop7h 25mSouthwest
Deal found 12/14$772
This Mytrip deal was found by Cheapflights users on 12/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/2712:45 pmSAT - ISP
3 stops21h 20mMultiple Airlines
vie. 1/27:25 amISP - SAT
2 stops17h 01mMultiple Airlines
Deal found 12/14$1,495

Find 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 diciembre 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$772
(Southwest)

Popular in

December

Cheapest in

August

Average price

$409
Provider with most accurate pricing for San Antonio-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Antonio-Islip Long Island flights.
Search Deals
From San Antonio to Islip Long Island
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($17 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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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 diciembre 15, 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

mar. 12/30

12:45 pm-4:37 pm

1 stop26h 52m

Islip Long Island

sáb. 1/3

6:00 am-5:37 am

2 stops24h 37m

$716

San AntonioIslip

SAT - ISP

SATISP

San Antonio

sáb. 12/27

5:30 pm-11:55 pm

1 stop5h 25m

Islip Long Island

vie. 1/2

5:50 pm-12:15 am

1 stop7h 25m

$772

San AntonioIslip

SAT - ISP

SATISP

San Antonio

sáb. 12/27

12:45 pm-11:05 am

3 stops21h 20m

Islip Long Island

vie. 1/2

7:25 am-11:26 pm

2 stops17h 01m

$1,495

San AntonioIslip

SAT - ISP

SATISP

San Antonio

vie. 1/30

6:30 am-8:52 am

1 stop25h 22m

$88

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Compare providers for flights from San Antonio to Islip

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 San Antonio to Islip in December.
ProviderPrice AccuracyTrust Score*
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 San Antonio-Islip, New York flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Antonio-Islip, New York flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Antonio-Islip, New York flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Antonio-Islip, New York 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 San Antonio-Islip, New York 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 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 $80). Flying from San Antonio to Islip, New York in July is currently the most expensive (average of $167). 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 diciembre 15, 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
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Overall

7.9

Entertainment

7.5

Comfort

8.0

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
7.9
Good
4,250 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Overall

7.9

Entertainment

7.5

Comfort

8.0

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, New York?

    For as low as $772, Southwest can have you in Islip, New York from San Antonio in 5h 25m. The distance between San Antonio and Islip, New York is about 1621 mi.

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

    According to our current data, Southwest ($309), 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 $80). Flying from San Antonio to Islip, New York in July is currently the most expensive (average of $167). 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

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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 diciembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$309Average$422FlexibilityNo cancel feeOn-time63%

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