ISP - SAT

$300 Find Cheap Flights from Islip to San Antonio

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Islip to San Antonio departing on 3/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to San Antonio

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to San Antonio, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to San Antonio, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$300
Southwest
Tue 4/21Tue 5/12
ISP - SAT • 1 stop
Cheapest one-way
$160
Frontier
Fri 3/6
ISP - SAT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Islip and San Antonio. You'll need at least 1 connection.
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We hope you love your trip to San Antonio!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Islip to San Antonio (ISP-SAT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Islip to San Antonio that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Islip to San Antonio

Tue, Apr 21 - Tue, May 12
Southwest Logo
4:10 pm - 9:40 pm
ISP
-
SAT
6h 30m
1 stop
Southwest Logo
2:55 pm - 10:40 pm
SAT
-
ISP
6h 45m
1 stop
$300Southwest
Tue, Apr 21 - Tue, May 12
Southwest Logo
12:30 pm - 8:15 pm
ISP
-
SAT
8h 45m
2 stops
Southwest Logo
5:45 am - 1:50 pm
SAT
-
ISP
7h 05m
1 stop
$305Southwest
Tue, Apr 21 - Tue, May 12
Southwest Logo
12:30 pm - 9:05 pm
ISP
-
SAT
9h 35m
2 stops
Southwest Logo
9:40 am - 6:30 pm
SAT
-
ISP
7h 50m
2 stops
$311Southwest
Fri, Mar 13 - Tue, Mar 17
Multiple Airlines Logo
1:42 pm - 12:27 pm
ISP
-
SAT
23h 45m
1 stop
Multiple Airlines Logo
2:08 pm - 11:10 am
SAT
-
ISP
20h 02m
2 stops
$589Multiple Airlines
Fri, Mar 13 - Tue, Mar 17
Southwest Logo
5:55 pm - 11:00 pm
ISP
-
SAT
6h 05m
1 stop
Southwest Logo
6:10 am - 1:40 pm
SAT
-
ISP
6h 30m
1 stop
$627Southwest
Fri, Mar 13 - Tue, Mar 17
Southwest Logo
2:00 pm - 11:10 pm
ISP
-
SAT
10h 10m
2 stops
Southwest Logo
6:10 am - 4:05 pm
SAT
-
ISP
8h 55m
2 stops
$782Southwest
Booking Insights

Good to know

Cheapest flight$160
Flight from Islip to San Antonio

When to book flights from Islip to San Antonio

Are your dates flexible? Find out the best times to travel from Islip to San Antonio based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Islip to San Antonio

  • What is the cheapest flight from Islip to San Antonio?

    In the last 3 days, the lowest price for a flight from Islip to San Antonio was $160 for a one-way ticket and $300 for a round-trip.

  • Do I need a passport to fly between Islip and San Antonio?

    A passport is not required to fly from Islip to San Antonio.

  • Which airports will I be using when flying from Islip to San Antonio?

    Islip airport is called Islip Long Island and the only airport in San Antonio is San Antonio.

  • Which aircraft models fly most regularly from Islip to San Antonio?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Islip to San Antonio?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Islip to San Antonio.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Islip to San Antonio?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Antonio from Islip is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Islip to San Antonio?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Antonio with an airline and back to Islip with another airline. Booking your flights between Islip and SAT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Islip to San Antonio?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Antonio from Islip up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Islip to San Antonio

 
See real verified KAYAK customer reviews for airlines flying from Islip to San Antonio. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Islip to San Antonio? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4303 reviews
8.6Crew
8.0Comfort
7.0Food
8.1Boarding
7.5Entertainment
Airline reviews

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

4.0 Okaybyron, Feb 2026
DAL - SAT
Read more Southwest reviews

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

Great flight but super high price. Glad it was a business trip and not personal

On time. Friendly staff. Took to long to pre bord all the specialty groups. Cramped small plane

Airline travel is always too cramped to really be pleasant, but the cabin crew on this flight did a pretty good job of making up for it by putting on some music during boarding and sprinkling a few funny remarks into the safety briefing and announcements, and just generally being friendly and helpful. It definitely reminded me of why I prefer the in-flight experience on Southwest!

No delays and arrived to destination 30 min early. Staff was super friendly.

Everything a cheap airline should be at normal airline rates.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

Everything you need to know for your flight from Islip to San Antonio

Information on your arrival and departure airports

Islip (ISP)
San Antonio (SAT)