HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Houston

$126+ Cheap flights from Islip, NY (ISP) to Houston

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/14. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — HOU
Jul 1 — Jul 81
Tue 7/1
Tue 7/8
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to Houston with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Islip to Houston

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Houston (HO1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 26, 2025.

Round-trip from

$251
(Southwest)

One-way from

$126
(Southwest)

Popular in

April

Cheapest in

January

Average price

$291
From Islip Long Island to Houston
Search Deals
One-way flight from Islip Long Island to Houston
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($135 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

Find flight deals from Islip to Houston

Cheapest flights from Islip to Houston
Explore the most affordable flight options available from Islip to Houston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 26, 2025.

This Priceline deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/99:39 amISP - IAH
1 stop8h 04mFrontier
Thu 10/169:08 pmIAH - ISP
1 stop10h 46mFrontier
Deal found 6/26$247
This Southwest deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/93:20 pmISP - HOU
1 stop9h 05mSouthwest
Thu 10/165:45 pmHOU - ISP
1 stop5h 00mSouthwest
Deal found 6/26$251
This Trip.com deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/228:00 amISP - IAH
1 stop16h 25mMultiple Airlines
Tue 7/295:00 amIAH - ISP
2 stops15h 58mMultiple Airlines
Deal found 6/23$350

Cheapflights Fare Finder

Customize your flight search to find flights from Islip to Houston 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, Cheapflights users made 2,558,603 searches. Data last updated June 26, 2025.
Use the filters below to find and compare flights from Islip to Houston that are best for you.

Fly from

Islip

Fly to

Houston

Route

Depart

Return

Price

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Thu 10/9

9:39 am-4:43 pm

1 stop8h 04m

Houston George Bush Intcntl

Thu 10/16

9:08 pm-8:54 am

1 stop10h 46m

$247

IslipHouston

ISP - HOU

ISPHOU

Islip Long Island

Thu 10/9

3:20 pm-11:25 pm

1 stop9h 05m

Houston Hobby

Thu 10/16

5:45 pm-11:45 pm

1 stop5h 00m

$251

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Tue 7/22

8:00 am-11:25 pm

1 stop16h 25m

Houston George Bush Intcntl

Tue 7/29

5:00 am-9:58 pm

2 stops15h 58m

$350

IslipHouston

ISP - HOU

ISPHOU

Islip Long Island

Thu 8/14

4:20 pm-10:50 pm

1 stop7h 30m

$126

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Fri 7/4

2:05 pm-7:51 pm

1 stop6h 46m

$133

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Sat 7/5

2:05 pm-12:11 am

2 stops11h 06m

$272

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/26

Best time to book a flight from Islip to Houston

Have a flexible travel schedule? Discover the best time to fly to Houston from Islip with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Islip to Houston

What is the cheapest month to book a flight from Islip, New York to Houston?

Currently, September is the cheapest month in which you can book a flight from Islip, New York to Houston (average of $230). Flying from Islip, New York to Houston in March is currently the most expensive (average of $332). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ISP to HOU?

Find hourly flight availability from Islip to Houston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 26, 2025.

It’s optimal to fly from Islip, New York to Houston at noon. By choosing this option you can save up to 20% on the cost of your flight, compared to a flight in the morning.

Reviews of airlines servicing Houston

Get insights into the airlines that provide service to Houston. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Houston. Reviews last updated June 26, 2025.
Get a feel of what it's like to fly with Southwest and Frontier from Islip to Houston by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,276 reviews

Boarding

8.2

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.0
Very good
4,276 reviews
Southwest
8.0
Very good
4,276 reviews

Boarding

8.2

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Frontier
5.9
Fair
3,296 reviews
Southwest
8.0
Very good
4,276 reviews

Boarding

8.2

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from Islip to Houston. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to Houston?

    For a flight from Islip to Houston, you will be flying from Long Island. Islip Long Island (ISP) is just 7.2 mi from the center of the city. Long Island is the only Islip airport and it handles 0 outbound flights to Houston per day. 1 airline has flights to Houston from Islip Long Island on a regular basis.

  • What are the cheapest airlines flying from Islip, New York to Houston round-trip?

    Southwest, at $251, was found to be the cheapest airline from Islip, New York to Houston. An alternate airline flying to your destination would be Frontier. Southwest is currently priced 45% below the average price you’ll pay for this route.

  • Can I find deals for flights from Islip to Houston that include hotel bookings?

    Yes. In addition to deals on Islip to Houston flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Houston?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Houston.

  • Can I find deals for business class flights from Islip to Houston?

    Yes. Cheapflights offers flight deals from Islip to Houston by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Islip, New York to Houston?

    Currently, September is the cheapest month in which you can book a flight from Islip, New York to Houston (average of $230). Flying from Islip, New York to Houston in March is currently the most expensive (average of $332). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Islip to Houston

See prices for flight routes from nearby airports that may be better suited for you.
LaGuardia to Dallas/Fort Worth flights
John F Kennedy Intl to Dallas/Fort Worth flights
John F Kennedy Intl to Hobby flights
LaGuardia to Hobby flights
Newark to Dallas/Fort Worth flights
Newark to Hobby flights
Newark to George Bush Intcntl flights
John F Kennedy Intl to Austin flights
John F Kennedy Intl to George Bush Intcntl flights
Newark to Austin flights
LaGuardia to George Bush Intcntl flights
LaGuardia to Austin flights
LaGuardia to Love Field flights
Newark to San Antonio flights
John F Kennedy Intl to San Antonio flights
Buffalo to Dallas/Fort Worth flights
LaGuardia to San Antonio flights
Albany to Dallas/Fort Worth flights
John F Kennedy Intl to Love Field flights
Newark to Love Field flights
Buffalo to Love Field flights
Syracuse to Dallas/Fort Worth flights
Rochester to Dallas/Fort Worth flights
White Plains to Austin flights
Islip to Dallas/Fort Worth flights
John F Kennedy Intl to El Paso flights
Rochester to San Antonio flights
Syracuse to Hobby flights
Newark to El Paso flights
White Plains to Dallas/Fort Worth flights
Stewart to Austin flights
Buffalo to Hobby flights
Albany to Austin flights
LaGuardia to El Paso flights
White Plains to Hobby flights
Syracuse to Austin flights
Syracuse to George Bush Intcntl flights
Rochester to Hobby flights
Buffalo to George Bush Intcntl flights
White Plains to George Bush Intcntl flights
Ithaca to Dallas/Fort Worth flights
Rochester to Austin flights
Albany to Love Field flights
Rochester to George Bush Intcntl flights
White Plains to San Antonio flights
Albany to San Antonio flights
Syracuse to San Antonio flights
Rochester to Love Field flights
Buffalo to Austin flights
Albany to Hobby flights

Top airline flying from Islip to Houston

Discover the top airline that operate flights from Islip to Houston. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$343Average$476FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.