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Cheap flights from Islip, New York to San Antonio from $339

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to San Antonio departing on 5/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Islip, New York to San Antonio

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
6:00 am - 10:45 am
ISP
-
SAT
5h 45m
1 stop
Southwest Logo
3:15 pm - 10:35 pm
SAT
-
ISP
6h 20m
1 stop
$421Southwest
Tue, Jun 23 - Wed, Jun 24
Southwest Logo
4:40 pm - 9:35 pm
ISP
-
SAT
5h 55m
1 stop
Southwest Logo
2:00 pm - 10:35 pm
SAT
-
ISP
7h 35m
2 stops
$426Southwest
Tue, Jun 23 - Wed, Jun 24
Southwest Logo
12:25 pm - 7:20 pm
ISP
-
SAT
7h 55m
2 stops
Southwest Logo
2:00 pm - 10:35 pm
SAT
-
ISP
7h 35m
2 stops
$431Southwest
Tue, Jun 23 - Wed, Jun 24
Southwest Logo
2:55 pm - 9:35 pm
ISP
-
SAT
7h 40m
1 stop
Southwest Logo
3:40 pm - 11:35 pm
SAT
-
ISP
6h 55m
2 stops
$436Southwest
Tue, Jun 23 - Fri, Jun 26
Southwest Logo
2:55 pm - 10:55 pm
ISP
-
SAT
9h 00m
2 stops
Southwest Logo
3:40 pm - 11:35 pm
SAT
-
ISP
6h 55m
2 stops
$441Southwest
Tue, Jun 23 - Fri, Jun 26
Southwest Logo
5:55 pm - 10:45 pm
ISP
-
SAT
5h 50m
1 stop
Southwest Logo
5:25 pm - 11:35 pm
SAT
-
ISP
5h 10m
1 stop
$444Southwest
Fri, Oct 2 - Mon, Oct 5
Southwest Logo
12:35 pm - 5:15 pm
ISP
-
SAT
5h 40m
1 stop
Southwest Logo
1:55 pm - 11:35 pm
SAT
-
ISP
8h 40m
2 stops
$449Southwest
Fri, Oct 2 - Mon, Oct 5
Southwest Logo
10:20 am - 5:50 pm
ISP
-
SAT
8h 30m
2 stops
Southwest Logo
1:55 pm - 11:35 pm
SAT
-
ISP
8h 40m
2 stops
$454Southwest
Fri, Oct 2 - Mon, Oct 5
Southwest Logo
6:00 am - 11:50 am
ISP
-
SAT
6h 50m
1 stop
Southwest Logo
5:10 am - 11:45 am
SAT
-
ISP
5h 35m
1 stop
$513Southwest
Mon, Jun 15 - Sun, Jun 21
Southwest Logo
6:00 am - 11:50 am
ISP
-
SAT
6h 50m
1 stop
Southwest Logo
2:00 pm - 11:35 pm
SAT
-
ISP
8h 35m
2 stops
$518Southwest
Mon, Jun 15 - Sun, Jun 21

Southwest flights from Islip, New York to San Antonio

Our best Southwest deals on Islip, New York to San Antonio flight tickets
Southwest
Jun 23
ISP6:00 amIslip Long Island
5h 45m
1 stop
SAT10:45 amSan Antonio
Jun 24
SAT3:15 pmSan Antonio
6h 20m
1 stop
ISP10:35 pmIslip Long Island
$421
Southwest
Jun 23
ISP4:40 pmIslip Long Island
5h 55m
1 stop
SAT9:35 pmSan Antonio
Jun 24
SAT2:00 pmSan Antonio
7h 35m
2 stops
ISP10:35 pmIslip Long Island
$426
Southwest
Jun 23
ISP12:25 pmIslip Long Island
7h 55m
2 stops
SAT7:20 pmSan Antonio
Jun 24
SAT2:00 pmSan Antonio
7h 35m
2 stops
ISP10:35 pmIslip Long Island
$431

Breeze Airways flights from Islip, New York to San Antonio

Our best Breeze Airways deals on Islip, New York to San Antonio flight tickets
Breeze Airways
Aug 17
ISP8:43 pmIslip Long Island
44h 30m
3 stops
SAT4:13 pmSan Antonio
Aug 24
SAT11:30 amSan Antonio
28h 17m
2 stops
ISP4:47 pmIslip Long Island
$819
Breeze Airways
Jun 23
ISP2:08 pmIslip Long Island
27h 05m
3 stops
SAT4:13 pmSan Antonio
Jun 26
SAT11:30 amSan Antonio
22h 47m
2 stops
ISP11:17 amIslip Long Island
$831
Breeze Airways
Aug 17
ISP8:43 pmIslip Long Island
44h 30m
3 stops
SAT4:13 pmSan Antonio
Aug 24
SAT11:30 amSan Antonio
24h 58m
3 stops
ISP1:28 pmIslip Long Island
$951

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York to San Antonio 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, momondo users made 832,500 searches. Data last updated May 18, 2026.
Use the filters below to find and compare flights from Islip, New York to San Antonio that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 6/23

6:00 am-10:45 am

1 stop5h 45m

San Antonio

Wed 6/24

3:15 pm-10:35 pm

1 stop6h 20m

$421

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 6/23

4:40 pm-9:35 pm

1 stop5h 55m

San Antonio

Wed 6/24

2:00 pm-10:35 pm

2 stops7h 35m

$426

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 6/23

12:25 pm-7:20 pm

2 stops7h 55m

San Antonio

Wed 6/24

2:00 pm-10:35 pm

2 stops7h 35m

$431

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 6/23

2:55 pm-9:35 pm

1 stop7h 40m

San Antonio

Fri 6/26

3:40 pm-11:35 pm

2 stops6h 55m

$436

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 6/23

2:55 pm-10:55 pm

2 stops9h 00m

San Antonio

Fri 6/26

3:40 pm-11:35 pm

2 stops6h 55m

$441
Quickest round-trip

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 10/2

5:55 pm-10:45 pm

1 stop5h 50m

San Antonio

Mon 10/5

5:25 pm-11:35 pm

1 stop5h 10m

$444

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 10/2

12:35 pm-5:15 pm

1 stop5h 40m

San Antonio

Mon 10/5

1:55 pm-11:35 pm

2 stops8h 40m

$449

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 10/2

10:20 am-5:50 pm

2 stops8h 30m

San Antonio

Mon 10/5

1:55 pm-11:35 pm

2 stops8h 40m

$454

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Mon 6/15

6:00 am-11:50 am

1 stop6h 50m

San Antonio

Sun 6/21

5:10 am-11:45 am

1 stop5h 35m

$513

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Mon 6/15

6:00 am-11:50 am

1 stop6h 50m

San Antonio

Sun 6/21

2:00 pm-11:35 pm

2 stops8h 35m

$518

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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2

See travel insights to San Antonio from

How to get the cheapest flight ticket from Islip, New York to San Antonio

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to San Antonio?

The cheapest day to depart on your flight to San Antonio is on a Thursday when prices can be found for as low as $405. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Monday is $612.

What is the cheapest time of day to depart on your flight to San Antonio?

According to our data, the cheapest time of day to fly to San Antonio is in the afternoon. momondo users have found flights departing from Islip, New York to San Antonio in the afternoon for as low as $319. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to San Antonio are more costly in the morning, with an average ticket price of $456. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Islip, New York to San Antonio

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to San Antonio according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Islip, New York to San Antonio (ISP to SAT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to San Antonio

Fastest flight time

6h 25m

Direct flights

None
The fastest flight from Islip, New York to San Antonio takes 6h 25m
There are no direct flights from Islip, New York to San Antonio. There are no popular flight routes from Islip, New York to San Antonio.
Search flight deals

Frequently asked questions about flying from Islip, New York to San Antonio

  • How far is Islip Long Island to San Antonio by plane?

    A flight from Islip Long Island to San Antonio will travel around 1619.5 mi. Flights usually cover this in 6h 25m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Islip Long Island Airport to San Antonio Airport?

    Prices for flights from Islip Long Island Airport to San Antonio Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Islip Long Island Airport to San Antonio Airport?

  • How old do you have to be to fly from Islip Long Island Airport to San Antonio Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to San Antonio Airport.

  • What documentation or ID do you need to fly to San Antonio Airport?

    The required travel and health documents for your San Antonio Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at San Antonio Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Islip, New York to San Antonio?

Best airlines flying from Islip, New York to San Antonio

Compare and see reviews for airlines that fly from Islip, New York to San Antonio with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $300Free CancellationRating
7.9
4,287 reviews
Search Southwest flights

Traveling to a place near San Antonio?

Book flights to San Antonio if you plan to visit one of these locations
New Braunfels
Kerrville
Boerne
Pleasanton
Schertz

Why use momondo?

Why should I use momondo to find a flight deal from Islip to San Antonio?

Finding the right flight to San Antonio from Islip is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to San Antonio quick and easy, saving you time and money.

Can I find flights from Islip to San Antonio with flexible booking policies on momondo?

Flights from Islip to San Antonio with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Islip to San Antonio?

Once you have performed a search for Islip to San Antonio flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Islip to San Antonio right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to San Antonio from Islip. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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