SAT - ISP

$197 Find Cheap Flights from San Antonio to Islip

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Antonio to Islip departing on 3/9. 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 Islip

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

Cheapest round-trip
$397
Southwest
Tue 3/17Tue 3/24
SAT - ISP • 1 stop
Cheapest one-way
$197
Southwest
Mon 3/9
SAT - ISP • 1 stop
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Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Antonio to Islip 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 San Antonio to Islip

Tue, Mar 17 - Tue, Mar 24
Southwest Logo
5:25 am - 11:40 am
SAT
-
ISP
5h 15m
1 stop
Southwest Logo
5:45 am - 12:50 pm
ISP
-
SAT
8h 05m
1 stop
$397Southwest
Tue, Mar 17 - Tue, Mar 24
Southwest Logo
5:25 am - 11:40 am
SAT
-
ISP
5h 15m
1 stop
Southwest Logo
5:45 am - 2:30 pm
ISP
-
SAT
9h 45m
2 stops
$402Southwest
Tue, Mar 17 - Tue, Mar 24
Southwest Logo
7:05 am - 4:05 pm
SAT
-
ISP
8h 00m
2 stops
Southwest Logo
2:20 pm - 9:50 pm
ISP
-
SAT
8h 30m
2 stops
$407Southwest
Fri, Feb 13 - Tue, Feb 17
Multiple Airlines Logo
1:57 pm - 10:46 am
SAT
-
ISP
19h 49m
1 stop
Multiple Airlines Logo
9:59 am - 9:30 am
ISP
-
SAT
48h 31m
2 stops
$473Multiple Airlines
Sun, Mar 8 - Thu, Mar 12
Multiple Airlines Logo
6:00 am - 12:33 pm
SAT
-
ISP
29h 33m
1 stop
Multiple Airlines Logo
7:26 pm - 9:32 am
ISP
-
SAT
39h 06m
2 stops
$488Multiple Airlines
Sat, Mar 7 - Thu, Mar 12
Multiple Airlines Logo
8:53 pm - 3:23 pm
SAT
-
ISP
17h 30m
1 stop
Multiple Airlines Logo
7:26 pm - 9:32 am
ISP
-
SAT
39h 06m
2 stops
$557Multiple Airlines
Sun, Mar 8 - Thu, Mar 12
Southwest Logo
5:15 am - 11:45 am
SAT
-
ISP
5h 30m
1 stop
Southwest Logo
6:00 am - 11:15 am
ISP
-
SAT
6h 15m
1 stop
$603Southwest
Sun, Mar 8 - Thu, Mar 12
Southwest Logo
2:30 pm - 11:50 pm
SAT
-
ISP
8h 20m
2 stops
Southwest Logo
6:00 am - 2:45 pm
ISP
-
SAT
9h 45m
2 stops
$628Southwest
Fri, Feb 13 - Tue, Feb 17
Southwest Logo
5:50 am - 5:00 pm
SAT
-
ISP
10h 10m
2 stops
Southwest Logo
5:55 am - 3:35 pm
ISP
-
SAT
10h 40m
2 stops
$637Southwest
Sat, Mar 7 - Thu, Mar 12
Multiple Airlines Logo
8:53 pm - 3:23 pm
SAT
-
ISP
17h 30m
1 stop
Multiple Airlines Logo
5:08 pm - 12:27 pm
ISP
-
SAT
20h 19m
1 stop
$727Multiple Airlines
Booking Insights

Good to know

Cheapest flight$197
Flight from San Antonio to Islip

When to book flights from San Antonio to Islip

Are your dates flexible? Find out the best times to travel from San Antonio to Islip 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 San Antonio to Islip

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

    In the last 3 days, the lowest price for a flight from San Antonio to Islip was $197 for a one-way ticket and $397 for a round-trip.

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

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

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

    On your way to Islip, you’ll fly out from San Antonio. You’ll be landing at Islip Long Island.

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

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

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

    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 San Antonio to Islip.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Islip from San Antonio 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 San Antonio to Islip?

    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 Islip with an airline and back to San Antonio with another airline. Booking your flights between San Antonio and ISP 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 San Antonio to Islip?

    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 Islip from San Antonio 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 San Antonio to Islip

 
See real verified KAYAK customer reviews for airlines flying from San Antonio to Islip. 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 San Antonio to Islip? 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 4267 reviews
8.1Boarding
8.0Comfort
7.5Entertainment
7.0Food
8.6Crew
Airline reviews

Great vacation. Can't wait till next year for another one.

10.0 ExcellentJohn, Jan 2026
SAT - PHX
Read more Southwest reviews

Great vacation. Can't wait till next year for another one.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

Pretty seamless, just a tad bit late in taking off and landing.

Check-in, Boarding and flight were smooth. All the employees and crew was very nice and funny. They gave the kids crayons and workbooks to keep them occupied which was a big win. I’ve flown Southwest many times and that’s the first time I’ve seen that and it is a great addition.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

Had to get off plane from prior flight even though I had to reboard same plane to continue to my final destination.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

southwest just starting charging for luggage. hadnt realized it until it was too late. now out $70 when i couldve bought a carry on if i wouldve known. free bags was one of the only reasons i chose southwest over another airline (the other being no assigned seats, which is apparently also being changed). stupid business decision. wont be flying southwest anymore.

after landing, we stay 2 hours on the taxi way before reaching the gate The airline and the crew were good though

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

Information on your arrival and departure airports