$152 Cheap Flights from Houston (IAH) to Islip (ISP)

View $152 flight on Tue, Sep 2, 2025Opens in a new window

Popular airlines from George Bush Intercontinental Airport (IAH) to MacArthur Airport (ISP)

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Cheap Flights from Houston to Islip (IAH-ISP)

Prices were available within the past 7 days and start at $152 for one-way flights and $304 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, Sep 2 - Wed, Sep 17
IAH
Houston
ISP
Islip
$304 Roundtrip, found 17 hours ago
$304
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Tue, Sep 2 from Houston to Islip, returning Wed, Sep 17, priced at $304 found 17 hours ago
Frontier Airlines
Sat, Aug 30 - Wed, Sep 3
IAH
Houston
ISP
Islip
$306 Roundtrip, found 19 hours ago
$306
Roundtrip
found 19 hours ago
Select Frontier Airlines flight, departing Sat, Aug 30 from Houston to Islip, returning Wed, Sep 3, priced at $306 found 19 hours ago
Frontier Airlines
Tue, Sep 2 - Sat, Sep 13
IAH
Houston
ISP
Islip
$315 Roundtrip, found 17 hours ago
$315
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Tue, Sep 2 from Houston to Islip, returning Sat, Sep 13, priced at $315 found 17 hours ago
Frontier Airlines
Sun, Aug 31 - Sat, Sep 13
IAH
Houston
ISP
Islip
$326 Roundtrip, found 17 hours ago
$326
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Sun, Aug 31 from Houston to Islip, returning Sat, Sep 13, priced at $326 found 17 hours ago
Frontier Airlines
Fri, Aug 1 - Mon, Aug 4
IAH
Houston
ISP
Islip
$327 Roundtrip, found 13 hours ago
$327
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Fri, Aug 1 from Houston to Islip, returning Mon, Aug 4, priced at $327 found 13 hours ago
Frontier Airlines
Fri, Aug 1 - Fri, Aug 8
IAH
Houston
ISP
Islip
$343 Roundtrip, found 1 hour ago
$343
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Fri, Aug 1 from Houston to Islip, returning Fri, Aug 8, priced at $343 found 1 hour ago
Frontier Airlines
Tue, Jul 15 - Wed, Jul 23
IAH
Houston
ISP
Islip
$350 Roundtrip, found 2 days ago
$350
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Tue, Jul 15 from Houston to Islip, returning Wed, Jul 23, priced at $350 found 2 days ago
Frontier Airlines
Sat, Jul 19 - Wed, Jul 23
IAH
Houston
ISP
Islip
$355 Roundtrip, found 2 days ago
$355
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Sat, Jul 19 from Houston to Islip, returning Wed, Jul 23, priced at $355 found 2 days ago
Frontier Airlines
Fri, Oct 10 - Wed, Oct 29
IAH
Houston
ISP
Islip
$359 Roundtrip, found 2 days ago
$359
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Fri, Oct 10 from Houston to Islip, returning Wed, Oct 29, priced at $359 found 2 days ago
JetBlue Airways
Tue, Jan 13 - Tue, Jan 27
IAH
Houston
ISP
Islip
$743 Roundtrip, found 5 days ago
$743
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Tue, Jan 13 from Houston to Islip, returning Tue, Jan 27, priced at $743 found 5 days ago
Flights from Houston (IAH) to Islip (ISP)
Origin airport
George Bush Intercontinental
Destination airport
MacArthur
Airlines serving
Frontier Airlines, JetBlue Airways
Roundtrip price
$304
Distance
1452 mi

Houston to Islip Flights

The cheapest times to fly from Houston 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 Houston to Islip are during the month of September. You can find some of the cheapest flights from Houston to Islip with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Houston to Islip

Sunday is one of the best days to book for cheap flights from Houston 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 Houston 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 Houston to Islip in 2025. You can also book with separate airlines for your outbound and return journeys, from $152 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 Houston 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 Houston 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.

 

Frequently asked questions

How much does a flight from George Bush Intercontinental Airport (IAH) to MacArthur Airport (ISP) cost?
Discover the latest flight deals from IAH to ISP by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from IAH to ISP?
The cheapest flights from IAH to ISP are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from IAH to ISP?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from IAH to ISP. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from George Bush Intercontinental Airport (IAH) to MacArthur Airport (ISP)?
You'll have to catch a flight with a layover if you're traveling from George Bush Intercontinental Airport (IAH) to MacArthur Airport (ISP). Direct flights don't operate daily on this route. However, simply filter your search to include one or more stops to find the best option for your trip.
What day of the week has the most flights from IAH to ISP?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from George Bush Intercontinental Airport (IAH) to MacArthur Airport (ISP)?
To avoid potential delays on the George Bush Intercontinental Airport (IAH) to MacArthur Airport (ISP) route, travel before 3 PM. Flights after this time have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Islip from George Bush Intercontinental Airport (IAH)?
If you're catching a direct flight from George Bush Intercontinental Airport (IAH) to Islip, you can land at either LaGuardia Airport (LGA) or John F. Kennedy Intl. Airport (JFK).
Is it cheaper to buy a plane ticket from George Bush Intercontinental Airport (IAH) to MacArthur Airport (ISP) last-minute?
Booking your flight from IAH to ISP right before your trip is usually more expensive. However, if there's some wiggle room with your departure dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book an IAH to ISP flight and hotel package?
Compared with arranging hotels and flights separately, booking an IAH to ISP flight and hotel package with Expedia could result in significant savings. What's more, having everything in one convenient place takes the hassle out of travel planning. Just pick your flights and choose from our wide range of hotels, then personalize your trip with other add-ons like car rentals and activities.
Can I cancel or change the date of my flight from George Bush Intercontinental Airport (IAH) to MacArthur Airport (ISP)?
It's usually possible to reschedule or cancel your IAH to ISP flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.