What is the cheapest airline that flies from Islip Long Island to San Antonio?

Frontier and Southwest are the most popular carriers operating from Islip Long Island to San Antonio

What airlines fly to San Antonio?

United Airlines, Delta and Spirit Airlines are the top three most popular airlines that fly to San Antonio from Islip, New York according to our data. United Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to San Antonio. Keep in mind that there are 7 different airlines that fly to San Antonio on a routine basis, so you have a few additional options to choose from.

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?

As of December 2025, there is 1 operator available to choose from 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.

$91 Cheap Flights from Islip to San Antonio in 2025/26

1 adult

0 bags

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Islip, New York to San Antonio

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:52 am - 11:52 pm

ISP

SAT

15h 00m1 stop

10:35 am - 6:48 pm

SAT

ISP

31h 13m2 stops

$230Multiple Airlines

Sun, Jan 18 - Sun, Jan 25

2:01 pm - 11:52 pm

ISP

SAT

34h 51m2 stops

8:00 pm - 10:46 pm

SAT

ISP

25h 46m1 stop

$236Multiple Airlines

Fri, Jan 9 - Mon, Jan 12

6:30 am - 12:50 pm

ISP

SAT

7h 20m1 stop

5:45 am - 1:50 pm

SAT

ISP

7h 05m1 stop

$387Southwest

Wed, Apr 15 - Tue, Apr 21

6:30 am - 12:50 pm

ISP

SAT

7h 20m1 stop

9:40 am - 6:30 pm

SAT

ISP

7h 50m2 stops

$392Southwest

Wed, Apr 15 - Tue, Apr 21

6:30 am - 3:05 pm

ISP

SAT

9h 35m2 stops

9:40 am - 6:30 pm

SAT

ISP

7h 50m2 stops

$397Southwest

Wed, Apr 15 - Tue, Apr 21

6:00 am - 12:15 pm

ISP

SAT

7h 15m1 stop

5:00 am - 11:50 am

SAT

ISP

5h 50m1 stop

$447Southwest

Fri, May 15 - Mon, May 18

6:00 am - 12:15 pm

ISP

SAT

7h 15m1 stop

3:05 pm - 11:30 pm

SAT

ISP

7h 25m2 stops

$452Southwest

Fri, May 15 - Mon, May 18

4:30 pm - 11:30 pm

ISP

SAT

8h 00m2 stops

11:10 am - 8:25 pm

SAT

ISP

8h 15m2 stops

$457Southwest

Fri, May 15 - Mon, May 18

11:55 am - 12:49 pm

ISP

SAT

25h 54m2 stops

1:44 pm - 8:41 am

SAT

ISP

17h 57m1 stop

$467Multiple Airlines

Sun, Mar 22 - Sat, Apr 4

12:40 pm - 9:10 pm

ISP

SAT

9h 30m1 stop

5:45 am - 11:55 am

SAT

ISP

5h 10m1 stop

$480Southwest

Fri, Jan 9 - Mon, Jan 12

Southwest flights from Islip, New York to San Antonio

Our best Southwest deals on Islip, New York to San Antonio flight tickets

Southwest

Apr 15

ISP6:30 amIslip Long Island

7h 20m

1 stop

SAT12:50 pmSan Antonio

Apr 21

SAT5:45 amSan Antonio

7h 05m

1 stop

ISP1:50 pmIslip Long Island

$387

Find similar

Southwest

Apr 15

ISP6:30 amIslip Long Island

7h 20m

1 stop

SAT12:50 pmSan Antonio

Apr 21

SAT9:40 amSan Antonio

7h 50m

2 stops

ISP6:30 pmIslip Long Island

$392

Find similar

Southwest

Apr 15

ISP6:30 amIslip Long Island

9h 35m

2 stops

SAT3:05 pmSan Antonio

Apr 21

SAT9:40 amSan Antonio

7h 50m

2 stops

ISP6:30 pmIslip Long Island

$397

Find similar

momondo Fare Finder

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

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Sun 1/18

9:52 am-11:52 pm

1 stop15h 00m

San Antonio

Sun 1/25

10:35 am-6:48 pm

2 stops31h 13m

$230

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 1/9

2:01 pm-11:52 pm

2 stops34h 51m

San Antonio

Mon 1/12

8:00 pm-10:46 pm

1 stop25h 46m

$236

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Wed 4/15

6:30 am-12:50 pm

1 stop7h 20m

San Antonio

Tue 4/21

5:45 am-1:50 pm

1 stop7h 05m

$387

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Wed 4/15

6:30 am-12:50 pm

1 stop7h 20m

San Antonio

Tue 4/21

9:40 am-6:30 pm

2 stops7h 50m

$392

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Wed 4/15

6:30 am-3:05 pm

2 stops9h 35m

San Antonio

Tue 4/21

9:40 am-6:30 pm

2 stops7h 50m

$397

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 5/15

6:00 am-12:15 pm

1 stop7h 15m

San Antonio

Mon 5/18

5:00 am-11:50 am

1 stop5h 50m

$447

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 5/15

6:00 am-12:15 pm

1 stop7h 15m

San Antonio

Mon 5/18

3:05 pm-11:30 pm

2 stops7h 25m

$452

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 5/15

4:30 pm-11:30 pm

2 stops8h 00m

San Antonio

Mon 5/18

11:10 am-8:25 pm

2 stops8h 15m

$457

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Sun 3/22

11:55 am-12:49 pm

2 stops25h 54m

San Antonio

Sat 4/4

1:44 pm-8:41 am

1 stop17h 57m

$467

IslipSan Antonio

ISP - SAT

ISPSAT

Islip Long Island

Fri 1/9

12:40 pm-9:10 pm

1 stop9h 30m

San Antonio

Mon 1/12

5:45 am-11:55 am

1 stop5h 10m

$480

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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 Wednesday when prices can be found for as low as $408. 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 $519.

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 evening. momondo users have found flights departing from Islip, New York to San Antonio in the evening for as low as $223. 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 $443. 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	7h 15m
Direct flights	None

The fastest flight from Islip, New York to San Antonio takes 7h 15m

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

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 7h 15m, 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?
As of December 2025, there is 1 operator available to choose from 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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Islip, New York to San Antonio is Southwest (100% of total bookings).

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
Southwest	PriceFrom $313	Free Cancellation	Rating 8.0 4,254 reviews		Search Southwest flights

New Braunfels

Kerrville

Boerne

Schertz

Pleasanton

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.