$111 Cheap Flights from San Antonio (SAT) to Islip (ISP)

View $111 flight on Tue, Mar 31, 2026Opens in a new window

Popular airlines from San Antonio International Airport (SAT) to MacArthur Airport (ISP)

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

Prices were available within the past 7 days and start at $111 for one-way flights and $427 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Thu, Jul 9 - Tue, Jul 14
SAT
San Antonio
ISP
Islip
$427 Roundtrip, found 5 days ago
$427
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Jul 9 from San Antonio to Islip, returning Tue, Jul 14, priced at $427 found 5 days ago
Southwest Airlines
Thu, Jul 9 - Tue, Jul 14
SAT
San Antonio
ISP
Islip
$437 Roundtrip, found 5 days ago
$437
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Jul 9 from San Antonio to Islip, returning Tue, Jul 14, priced at $437 found 5 days ago
Southwest Airlines
Thu, Oct 15 - Mon, Oct 19
SAT
San Antonio
ISP
Islip
$452 Roundtrip, found 2 days ago
$452
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Thu, Oct 15 from San Antonio to Islip, returning Mon, Oct 19, priced at $452 found 2 days ago
Southwest Airlines
Thu, Jul 9 - Tue, Jul 14
SAT
San Antonio
ISP
Islip
$454 Roundtrip, found 5 days ago
$454
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Jul 9 from San Antonio to Islip, returning Tue, Jul 14, priced at $454 found 5 days ago
Southwest Airlines
Thu, May 21 - Fri, May 22
SAT
San Antonio
ISP
Islip
$457 Roundtrip, found 2 days ago
$457
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Thu, May 21 from San Antonio to Islip, returning Fri, May 22, priced at $457 found 2 days ago
Southwest Airlines
Thu, Oct 15 - Mon, Oct 19
SAT
San Antonio
ISP
Islip
$458 Roundtrip, found 2 days ago
$458
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Thu, Oct 15 from San Antonio to Islip, returning Mon, Oct 19, priced at $458 found 2 days ago
Southwest Airlines
Wed, Jul 22 - Sun, Jul 26
SAT
San Antonio
ISP
Islip
$458 Roundtrip, found 3 days ago
$458
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Wed, Jul 22 from San Antonio to Islip, returning Sun, Jul 26, priced at $458 found 3 days ago
Southwest Airlines
Thu, Jul 9 - Tue, Jul 14
SAT
San Antonio
ISP
Islip
$464 Roundtrip, found 5 days ago
$464
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Jul 9 from San Antonio to Islip, returning Tue, Jul 14, priced at $464 found 5 days ago
Southwest Airlines
Wed, Jul 1 - Tue, Jul 7
SAT
San Antonio
ISP
Islip
$467 Roundtrip, found 6 days ago
$467
Roundtrip
found 6 days ago
Select Southwest Airlines flight, departing Wed, Jul 1 from San Antonio to Islip, returning Tue, Jul 7, priced at $467 found 6 days ago
Southwest Airlines
Thu, Oct 15 - Mon, Oct 19
SAT
San Antonio
ISP
Islip
$468 Roundtrip, found 2 days ago
$468
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Thu, Oct 15 from San Antonio to Islip, returning Mon, Oct 19, priced at $468 found 2 days ago

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Frequently asked questions

How much does a flight from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) cost?
You can find cheap one-way flights from $111 and cheap return flights from $427 San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) with Expedia. One-way flights usually range from $316 to $1002, and return flights typically cost between $482 and $1971. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
The cheapest month to fly from SAT to ISP is July when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
Enter SAT to ISP and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
Frontier Airlines is one of the cheapest airlines offering connecting flights from San Antonio, TX (SAT) to Islip, NY (ISP), with round-trip tickets starting from around $286 with a layover in Hartsfield-Jackson Atlanta Intl. (ATL). Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
To find a cheap flight from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
The earliest flight from San Antonio International Airport (SAT) to MacArthur Airport (ISP) usually leaves at around 5:00 AM, operated by American Airlines. This service is seasonal and runs during July, August, and September. An early flight allows you to make the most of your time in Islip. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
For flights from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur), the most popular departure times are in the early morning, from 3am to 6am. About 41% of passengers prefer this time window. Many major carriers, including Southwest Airlines and United Airlines, offer flights during this period. This timing is popular because it allows travelers to maximize their day upon arrival.
How long does it take to fly from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
Flights from SAT to ISP with one stop typically take around 5 hours 30 minutes, covering approximately 1,623 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
Select the "Business class" and "First class" filters when looking for SAT to ISP flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) flight with Expedia?
It's easy to earn miles on a San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Islip from San Antonio Intl. (SAT)?
If you're planning to travel to Islip from San Antonio Intl. (SAT), you can fly into MacArthur (ISP) Some flights may connect through major hubs like Love Field (DAL), George Bush Intercontinental (IAH), William P. Hobby (HOU) before reaching Islip. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) at the last minute?
Typically, booking a last minute flight from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) flight and hotel package?
Securing a San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur)?
If you booked your San Antonio, TX (SAT-San Antonio Intl.) to Islip, NY (ISP-MacArthur) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
San Antonio Intl.
Destination airport
MacArthur
Airlines serving
Southwest Airlines
Roundtrip price
$426
Distance
1622 mi

Book with confidence

San Antonio to Islip Flights

The cheapest times to fly from San Antonio to Islip

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Antonio to Islip are during the month of July. You can find some of the cheapest flights from San Antonio to Islip with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Antonio to Islip

Sunday is one of the best days to book for cheap flights from San Antonio to Islip: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Antonio to Islip

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Antonio to Islip in 2026. You can also book with separate airlines for your outbound and return journeys, from $111 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Antonio to Islip flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Antonio to Islip airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Antonio to Islip Flights

*Flight schedules are subject to change.

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