$131 Cheap Flights from Houston (IAH) to Islip (ISP)

View $131 flight on Fri, May 16, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from Houston to Islip (IAH-ISP)

Prices were available within the past 7 days and start at $131 for one-way flights and $250 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, May 14 - Tue, May 20
IAH
Houston
ISP
Islip
$250 Roundtrip, found 9 hours ago
$250
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Wed, May 14 from Houston to Islip, returning Tue, May 20, priced at $250 found 9 hours ago
Frontier Airlines
Wed, May 7 - Tue, May 20
IAH
Houston
ISP
Islip
$260 Roundtrip, found 5 hours ago
$260
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Wed, May 7 from Houston to Islip, returning Tue, May 20, priced at $260 found 5 hours ago
Frontier Airlines
Sun, May 4 - Tue, May 20
IAH
Houston
ISP
Islip
$270 Roundtrip, found 5 hours ago
$270
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sun, May 4 from Houston to Islip, returning Tue, May 20, priced at $270 found 5 hours ago
Frontier Airlines
Sat, May 3 - Tue, May 20
IAH
Houston
ISP
Islip
$280 Roundtrip, found 5 hours ago
$280
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sat, May 3 from Houston to Islip, returning Tue, May 20, priced at $280 found 5 hours ago
Frontier Airlines
Tue, Apr 29 - Fri, May 2
IAH
Houston
ISP
Islip
$290 Roundtrip, found 1 day ago
$290
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Apr 29 from Houston to Islip, returning Fri, May 2, priced at $290 found 1 day ago
Frontier Airlines
Thu, May 8 - Fri, May 23
IAH
Houston
ISP
Islip
$310 Roundtrip, found 5 hours ago
$310
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Thu, May 8 from Houston to Islip, returning Fri, May 23, priced at $310 found 5 hours ago
Frontier Airlines
Fri, Apr 25 - Tue, Apr 29
IAH
Houston
ISP
Islip
$320 Roundtrip, found 1 day ago
$320
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Apr 25 from Houston to Islip, returning Tue, Apr 29, priced at $320 found 1 day ago
JetBlue Airways
Fri, Aug 22 - Thu, Sep 11
IAH
Houston
ISP
Islip
$321 Roundtrip, found 5 hours ago
$321
Roundtrip
found 5 hours ago
Select JetBlue Airways flight, departing Fri, Aug 22 from Houston to Islip, returning Thu, Sep 11, priced at $321 found 5 hours ago
Frontier Airlines
Thu, Jun 5 - Sat, Jun 21
IAH
Houston
ISP
Islip
$321 Roundtrip, found 5 hours ago
$321
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Thu, Jun 5 from Houston to Islip, returning Sat, Jun 21, priced at $321 found 5 hours ago
Frontier Airlines
Sun, May 4 - Thu, May 22
IAH
Houston
ISP
Islip
$330 Roundtrip, found 5 hours ago
$330
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sun, May 4 from Houston to Islip, returning Thu, May 22, priced at $330 found 5 hours ago
Flights from Houston (IAH) to Islip (ISP)
Origin airport
George Bush Intercontinental
Destination airport
MacArthur
Airlines serving
Frontier Airlines, JetBlue Airways
Roundtrip price
$250
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 May. 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 $131 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.