SAT - ISP

$155 Find Cheap Flights from San Antonio to Islip - Compare and Save

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 8/22. 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

Save 20% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$345
Frontier
Mon 9/14Tue 9/22
SAT - ISP • 1 stop
Cheapest one-way
$155
Frontier
Sat 8/22
SAT - ISP • 1 stop
Top airlines
Frontier
Cheapest • from $367 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between San Antonio and Islip. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Islip!
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

Mon, Sep 14 - Tue, Sep 22
Multiple Airlines Logo
10:05 am - 4:58 pm
SAT
-
ISP
29h 53m
1 stop
Multiple Airlines Logo
1:38 pm - 9:07 am
ISP
-
SAT
20h 29m
2 stops
$345Multiple Airlines
Mon, Sep 14 - Tue, Sep 22
Frontier Logo
10:05 am - 4:58 pm
SAT
-
ISP
29h 53m
1 stop
Frontier Logo
5:43 pm - 9:07 am
ISP
-
SAT
16h 24m
1 stop
$367Frontier
Mon, Sep 14 - Tue, Sep 22
Southwest Logo
12:20 pm - 10:10 pm
SAT
-
ISP
8h 50m
2 stops
Southwest Logo
3:20 pm - 11:15 pm
ISP
-
SAT
8h 55m
2 stops
$390Southwest
Thu, Aug 20 - Mon, Aug 24
Southwest Logo
5:45 am - 4:25 pm
SAT
-
ISP
9h 40m
2 stops
Southwest Logo
4:05 pm - 9:30 pm
ISP
-
SAT
6h 25m
1 stop
$490Southwest
Thu, Aug 20 - Mon, Aug 24
Southwest Logo
5:35 am - 4:25 pm
SAT
-
ISP
9h 50m
2 stops
Southwest Logo
1:15 pm - 10:00 pm
ISP
-
SAT
9h 45m
2 stops
$495Southwest
Sat, Aug 15 - Wed, Aug 19
Multiple Airlines Logo
5:38 pm - 9:53 am
SAT
-
ISP
39h 15m
2 stops
Multiple Airlines Logo
11:57 am - 9:15 am
ISP
-
SAT
22h 18m
1 stop
$497Multiple Airlines
Thu, Aug 13 - Mon, Aug 17
Multiple Airlines Logo
9:55 am - 1:28 pm
SAT
-
ISP
26h 33m
1 stop
Multiple Airlines Logo
10:57 am - 9:29 pm
ISP
-
SAT
35h 32m
2 stops
$515Multiple Airlines
Thu, Aug 20 - Mon, Aug 24
Southwest Logo
2:55 pm - 10:05 pm
SAT
-
ISP
6h 10m
1 stop
Southwest Logo
4:05 pm - 9:30 pm
ISP
-
SAT
6h 25m
1 stop
$554Southwest
Sat, Aug 15 - Wed, Aug 19
Southwest Logo
10:05 am - 7:30 pm
SAT
-
ISP
8h 25m
1 stop
Southwest Logo
12:55 pm - 6:00 pm
ISP
-
SAT
6h 05m
1 stop
$597Southwest
Wed, Aug 12 - Sun, Aug 16
Southwest Logo
2:35 pm - 9:05 pm
SAT
-
ISP
5h 30m
1 stop
Southwest Logo
10:20 am - 8:20 pm
ISP
-
SAT
11h 00m
2 stops
$602Southwest
Booking Insights

KAYAK's insights & trends for San Antonio to Islip flights

Get data-powered insights and trends into flights from San Antonio to Islip to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from San Antonio to Islip?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 5 days.

In the past 5 days, the cheapest round-trip tickets from San Antonio to Islip were found on Frontier ($367) and Southwest ($390).

Find deals

Good to know

Cheapest flight

$155
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 5 days, the lowest price for a flight from San Antonio to Islip was $155 for a one-way ticket and $345 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 4229 reviews
7.5Entertainment
8.0Comfort
8.1Boarding
8.6Crew
7.0Food
Airline reviews

Had a great flight. Delayed takeoff, but comfortable. Snacks were good.

10.0 ExcellentMelissa, Mar 2026
MSY - LGA
Read more Southwest reviews

Had a great flight. Delayed takeoff, but comfortable. Snacks were good.

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

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

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.

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

My flight to Chicago left and landed early. My return flight left two minutes late and arrived 2 minutes late. My seat selections were ideal! There were no snacks going to Chicago and no snacks on the return trip. There are no charging outlets on board.

Gate agents were informative and friendly… flight attendants were as well. Had a fun time chatting about their legacy AirTran experiences as a former fan of the airline that Southwest acquired.

The fluidity of the entire process of boarding the plane the flight attendants attentiveness. The flight attendants also provided coloring books for my kids who loved it.

We stood on the tarmac for over an hour. Very bad turbulence the whole ride. Very to get to the restroom.

It was good. I wish you had gluten free snacks for my husband.

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

Information on your arrival and departure airports

San Antonio (SAT)
Islip (ISP)