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$79+ 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 9/7. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — HOU
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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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 August 14, 2025.

Round-trip from

$157
(Cheapflightsfares)

One-way from

$79
(Cheapflightsfares)

Popular in

April

Cheapest in

January

Average price

$376
From Islip Long Island to Houston
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One-way flight from Islip Long Island to Houston
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Highest demand for flights based on searches. 22% potential increase in price ($135 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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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 August 14, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/179:54 amISP - IAH
1 stop6h 42mFrontier
Tue 11/1810:28 amIAH - ISP
1 stop6h 14mFrontier
Deal found 8/14$157
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/286:05 amISP - IAH
1 stop10h 40mFrontier
Thu 9/49:10 pmIAH - ISP
1 stop10h 54mFrontier
Deal found 8/14$160
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/75:12 pmISP - IAH
1 stop23h 27mFrontier
Tue 9/94:36 pmIAH - ISP
1 stop17h 04mFrontier
Deal found 8/14$167
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1711:35 amISP - IAH
1 stop28h 29mFrontier
Sun 9/2111:44 amIAH - ISP
1 stop21h 56mFrontier
Deal found 8/14$176
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1711:35 amISP - IAH
2 stops13h 21mMultiple Airlines
Sun 9/2111:44 amIAH - ISP
1 stop21h 56mMultiple Airlines
Deal found 8/14$192
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/269:49 amISP - IAH
1 stop6h 55mFrontier
Mon 9/295:47 pmIAH - ISP
2 stops15h 53mFrontier
Deal found 8/14$193
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1111:25 amISP - IAH
1 stop25h 27mMultiple Airlines
Sun 9/1411:44 amIAH - ISP
1 stop21h 56mMultiple Airlines
Deal found 8/13$203
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1011:35 amISP - IAH
2 stops11h 55mMultiple Airlines
Sun 9/1411:44 amIAH - ISP
1 stop21h 56mMultiple Airlines
Deal found 8/13$208
This Southwest deal was found by Cheapflights users on 8/14. 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.
Wed 9/1712:30 pmISP - HOU
1 stop8h 35mSouthwest
Sun 9/2112:20 pmHOU - ISP
1 stop6h 30mSouthwest
Deal found 8/14$229
This Southwest deal was found by Cheapflights users on 8/13. 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.
Sun 9/76:00 amISP - HOU
2 stops7h 30mSouthwest
Tue 9/96:30 amHOU - ISP
1 stop5h 45mSouthwest
Deal found 8/13$234
This Southwest deal was found by Cheapflights users on 8/13. 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.
Wed 9/1012:30 pmISP - HOU
2 stops8h 30mSouthwest
Sun 9/146:30 amHOU - ISP
1 stop9h 30mSouthwest
Deal found 8/13$240
This Southwest deal was found by Cheapflights users on 8/13. 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 9/113:05 pmISP - HOU
1 stop6h 45mSouthwest
Sun 9/146:30 amHOU - ISP
1 stop9h 30mSouthwest
Deal found 8/13$248

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 August 14, 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

Mon 11/17

9:54 am-3:36 pm

1 stop6h 42m

Houston George Bush Intcntl

Tue 11/18

10:28 am-5:42 pm

1 stop6h 14m

$157

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Mon 10/27

9:49 am-4:43 pm

1 stop7h 54m

Houston George Bush Intcntl

Tue 10/28

10:28 am-5:42 pm

1 stop6h 14m

$160

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Thu 8/28

6:05 am-3:45 pm

1 stop10h 40m

Houston George Bush Intcntl

Thu 9/4

9:10 pm-9:04 am

1 stop10h 54m

$160

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Fri 9/26

9:49 am-3:44 pm

1 stop6h 55m

Houston George Bush Intcntl

Mon 9/29

11:39 am-10:40 am

1 stop22h 01m

$167

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Sun 9/7

5:12 pm-3:39 pm

1 stop23h 27m

Houston George Bush Intcntl

Tue 9/9

4:36 pm-10:40 am

1 stop17h 04m

$167

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Wed 9/17

11:35 am-3:04 pm

1 stop28h 29m

Houston George Bush Intcntl

Sun 9/21

11:44 am-10:40 am

1 stop21h 56m

$176

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Wed 9/17

11:35 am-11:56 pm

2 stops13h 21m

Houston George Bush Intcntl

Sun 9/21

11:44 am-10:40 am

1 stop21h 56m

$192

IslipHouston

ISP - HOU

ISPHOU

Islip Long Island

Wed 9/17

12:30 pm-8:05 pm

1 stop8h 35m

Houston Hobby

Sun 9/21

12:20 pm-7:50 pm

1 stop6h 30m

$229

IslipHouston

ISP - HOU

ISPHOU

Islip Long Island

Wed 9/10

4:00 pm-9:30 pm

1 stop6h 30m

Houston Hobby

Sun 9/14

6:30 am-5:00 pm

1 stop9h 30m

$234

IslipHouston

ISP - HOU

ISPHOU

Islip Long Island

Sun 9/7

6:00 am-12:30 pm

2 stops7h 30m

Houston Hobby

Tue 9/9

6:30 am-1:15 pm

1 stop5h 45m

$234

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 23 results
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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 $331). 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 August 14, 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 August 14, 2025.
Get a feel of what it's like to fly with Southwest 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
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

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
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

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 is the cheapest airline to fly from Islip, New York to Houston round-trip?

    Southwest, at $343, was found to be the cheapest airline from Islip, New York to Houston.. Southwest is currently priced 24% 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 $331). 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

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Alternative routes for Islip to Houston

See prices for flight routes from nearby airports that may be better suited for you.
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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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$343Average$476FlexibilityNo cancel feeOn-time63%

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