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Cheap flights from Islip, New York to San Antonio from $182

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 8/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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
3:20 pm - 11:05 pm
ISP
-
SAT
8h 45m
2 stops
Southwest Logo
5:35 am - 4:25 pm
SAT
-
ISP
9h 50m
2 stops
$293Southwest
Tue, Aug 18 - Mon, Aug 24
Southwest Logo
3:10 pm - 11:00 pm
ISP
-
SAT
8h 50m
1 stop
Southwest Logo
5:15 am - 12:10 pm
SAT
-
ISP
5h 55m
1 stop
$324Southwest
Fri, Oct 23 - Wed, Oct 28
Southwest Logo
5:40 pm - 11:00 pm
ISP
-
SAT
6h 20m
1 stop
Southwest Logo
5:50 am - 3:45 pm
SAT
-
ISP
8h 55m
2 stops
$329Southwest
Fri, Oct 23 - Wed, Oct 28
Southwest Logo
6:05 am - 11:00 am
ISP
-
SAT
5h 55m
1 stop
Southwest Logo
7:10 am - 4:25 pm
SAT
-
ISP
8h 15m
2 stops
$337Southwest
Tue, Aug 18 - Mon, Aug 24
Multiple Airlines Logo
4:13 pm - 9:02 am
ISP
-
SAT
17h 49m
1 stop
Multiple Airlines Logo
12:38 pm - 11:20 am
SAT
-
ISP
21h 42m
2 stops
$340Multiple Airlines
Thu, Sep 10 - Mon, Sep 14
Southwest Logo
6:00 am - 1:40 pm
ISP
-
SAT
8h 40m
2 stops
Southwest Logo
1:35 pm - 10:35 pm
SAT
-
ISP
8h 00m
2 stops
$376Southwest
Fri, Oct 23 - Wed, Oct 28
Frontier Logo
4:13 pm - 9:02 am
ISP
-
SAT
17h 49m
1 stop
Frontier Logo
9:57 am - 9:33 am
SAT
-
ISP
22h 36m
1 stop
$384Frontier
Thu, Sep 10 - Mon, Sep 14
Multiple Airlines Logo
11:57 am - 9:15 am
ISP
-
SAT
22h 18m
1 stop
Multiple Airlines Logo
5:38 pm - 9:53 am
SAT
-
ISP
39h 15m
2 stops
$388Multiple Airlines
Sat, Aug 1 - Sat, Aug 8
Southwest Logo
6:10 am - 2:45 pm
ISP
-
SAT
9h 35m
2 stops
Southwest Logo
2:05 pm - 10:05 pm
SAT
-
ISP
7h 00m
2 stops
$394Southwest
Thu, Sep 10 - Mon, Sep 14
Southwest Logo
6:05 am - 11:00 am
ISP
-
SAT
5h 55m
1 stop
Southwest Logo
2:55 pm - 10:05 pm
SAT
-
ISP
6h 10m
1 stop
$415Southwest
Tue, Aug 18 - Mon, Aug 24

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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
Sep 1
ISP2:08 pmIslip Long Island
27h 05m
3 stops
SAT4:13 pmSan Antonio
Sep 4
SAT11:30 amSan Antonio
22h 47m
2 stops
ISP11:17 amIslip Long Island
$694
Breeze Airways
Sep 1
ISP5:27 pmIslip Long Island
23h 46m
2 stops
SAT4:13 pmSan Antonio
Sep 4
SAT11:30 amSan Antonio
22h 47m
2 stops
ISP11:17 amIslip Long Island
$718
Breeze Airways
Aug 18
ISP2:08 pmIslip Long Island
27h 05m
3 stops
SAT4:13 pmSan Antonio
Aug 24
SAT11:30 amSan Antonio
28h 17m
2 stops
ISP4:47 pmIslip Long Island
$744

Southwest flights from Islip, New York to San Antonio

Our best Southwest deals on Islip, New York to San Antonio flight tickets
Southwest
Aug 18
ISP3:20 pmIslip Long Island
8h 45m
2 stops
SAT11:05 pmSan Antonio
Aug 24
SAT5:35 amSan Antonio
9h 50m
2 stops
ISP4:25 pmIslip Long Island
$293
Southwest
Oct 23
ISP3:10 pmIslip Long Island
8h 50m
1 stop
SAT11:00 pmSan Antonio
Oct 28
SAT5:15 amSan Antonio
5h 55m
1 stop
ISP12:10 pmIslip Long Island
$324
Southwest
Oct 23
ISP5:40 pmIslip Long Island
6h 20m
1 stop
SAT11:00 pmSan Antonio
Oct 28
SAT5:50 amSan Antonio
8h 55m
2 stops
ISP3:45 pmIslip Long Island
$329

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 July 11, 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 8/18

3:20 pm-11:05 pm

2 stops8h 45m

San Antonio

Mon 8/24

5:35 am-4:25 pm

2 stops9h 50m

$293

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 10/23

3:10 pm-11:00 pm

1 stop8h 50m

San Antonio

Wed 10/28

5:15 am-12:10 pm

1 stop5h 55m

$324

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 10/23

5:40 pm-11:00 pm

1 stop6h 20m

San Antonio

Wed 10/28

5:50 am-3:45 pm

2 stops8h 55m

$329

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 8/18

6:05 am-11:00 am

1 stop5h 55m

San Antonio

Mon 8/24

7:10 am-4:25 pm

2 stops8h 15m

$337

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Thu 9/10

4:13 pm-9:02 am

1 stop17h 49m

San Antonio

Mon 9/14

12:38 pm-11:20 am

2 stops21h 42m

$340

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 10/23

6:00 am-1:40 pm

2 stops8h 40m

San Antonio

Wed 10/28

1:35 pm-10:35 pm

2 stops8h 00m

$376

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Thu 9/10

4:13 pm-9:02 am

1 stop17h 49m

San Antonio

Mon 9/14

9:57 am-9:33 am

1 stop22h 36m

$384

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Sat 8/1

11:57 am-9:15 am

1 stop22h 18m

San Antonio

Sat 8/8

5:38 pm-9:53 am

2 stops39h 15m

$388

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Thu 9/10

6:10 am-2:45 pm

2 stops9h 35m

San Antonio

Mon 9/14

2:05 pm-10:05 pm

2 stops7h 00m

$394
Quickest round-trip

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Tue 8/18

6:05 am-11:00 am

1 stop5h 55m

San Antonio

Mon 8/24

2:55 pm-10:05 pm

1 stop6h 10m

$415

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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 $424. 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 $613.

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 at noon. momondo users have found flights departing from Islip, New York to San Antonio at noon for as low as $408. 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 $477. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Islip, New York to San Antonio flights?

You could potentially save up to 49% on your flight if you consider stops on a Islip, New York to San Antonio flight.

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 35m

Direct flights

None
The fastest flight from Islip, New York to San Antonio takes 6h 35m
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 35m, 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
4,248 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
Pleasanton
Boerne
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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