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$103+ Cheap flights from Islip (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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — HOU
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 September 17, 2025.

Round-trip from

$160
(Frontier)

One-way from

$103
(Kiwi.com)

Popular in

April

Cheapest in

January

Average price

$406
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. 26% potential increase in price ($158 potential increase over avg. RT price).
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Cheapest flight prices on average. 10% potential price decrease ($40 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 17, 2025.

This Frontier deal was found by Cheapflights users on 9/15. 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.
Sun 10/129:47 pmISP - IAH
1 stop10h 17mFrontier
Sun 10/197:57 pmIAH - ISP
1 stop12h 07mFrontier
Deal found 9/15$160
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 11/194:58 pmISP - IAH
1 stop8h 27mMultiple Airlines
Wed 12/38:36 pmIAH - ISP
2 stops13h 24mMultiple Airlines
Deal found 9/16$236
This Frontier deal was found by Cheapflights users on 9/14. 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.
Sun 10/129:44 amISP - IAH
1 stop7h 54mFrontier
Mon 10/135:38 pmIAH - ISP
2 stops15h 06mFrontier
Deal found 9/14$239
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 11/194:58 pmISP - IAH
1 stop8h 27mMultiple Airlines
Tue 12/29:05 pmIAH - ISP
1 stop21h 09mMultiple Airlines
Deal found 9/16$252
This Southwest deal was found by Cheapflights users on 9/17. 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 11/512:55 pmISP - HOU
2 stops7h 50mSouthwest
Thu 11/64:20 pmHOU - ISP
1 stop6h 30mSouthwest
Deal found 9/17$254
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 9/2511:40 amISP - IAH
1 stop21h 44mMultiple Airlines
Wed 10/15:48 pmIAH - ISP
1 stop16h 07mMultiple Airlines
Deal found 9/15$257
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/45:18 pmISP - IAH
1 stop23h 51mFrontier
Sat 10/118:37 pmIAH - ISP
1 stop23h 15mFrontier
Deal found 9/16$274
This Southwest deal was found by Cheapflights users on 9/17. 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 10/235:35 pmISP - HOU
1 stop7h 10mSouthwest
Fri 10/243:55 pmHOU - ISP
2 stops6h 50mSouthwest
Deal found 9/17$276
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Sat 10/45:05 pmISP - IAH
2 stops18h 39mMultiple Airlines
Tue 10/75:25 amIAH - ISP
1 stop14h 17mMultiple Airlines
Deal found 9/16$298
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 11/2010:02 amISP - IAH
1 stop9h 21mMultiple Airlines
Wed 12/38:36 pmIAH - ISP
2 stops13h 24mMultiple Airlines
Deal found 9/16$307
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Mon 11/174:58 pmISP - IAH
1 stop17h 35mMultiple Airlines
Thu 11/208:36 pmIAH - ISP
2 stops22h 31mMultiple Airlines
Deal found 9/15$314
This Frontier deal was found by Cheapflights users on 9/17. 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 12/59:09 pmISP - IAH
1 stop12h 45mFrontier
Sun 12/77:08 pmIAH - ISP
1 stop13h 03mFrontier
Deal found 9/17$316

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 September 17, 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

Sun 10/12

9:47 pm-7:04 am

1 stop10h 17m

Houston George Bush Intcntl

Sun 10/19

7:57 pm-9:04 am

1 stop12h 07m

$160

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Sun 10/12

9:44 am-4:38 pm

1 stop7h 54m

Houston George Bush Intcntl

Tue 10/14

5:42 pm-9:44 am

2 stops15h 02m

$239

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Wed 11/19

4:58 pm-12:25 am

1 stop8h 27m

Houston George Bush Intcntl

Wed 12/3

6:30 am-7:14 pm

1 stop11h 44m

$252

IslipHouston

ISP - HOU

ISPHOU

Islip Long Island

Wed 11/5

12:55 pm-7:45 pm

2 stops7h 50m

Houston Hobby

Thu 11/6

4:20 pm-11:50 pm

1 stop6h 30m

$254

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Thu 9/25

11:40 am-8:24 am

1 stop21h 44m

Houston George Bush Intcntl

Wed 10/1

5:48 pm-10:55 am

1 stop16h 07m

$257

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Sat 10/4

5:18 pm-4:09 pm

1 stop23h 51m

Houston George Bush Intcntl

Sat 10/11

8:37 pm-8:52 pm

1 stop23h 15m

$274

IslipHouston

ISP - HOU

ISPHOU

Islip Long Island

Thu 10/23

5:35 pm-11:45 pm

1 stop7h 10m

Houston Hobby

Fri 10/24

3:55 pm-11:45 pm

2 stops6h 50m

$276

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Mon 11/17

4:58 pm-9:33 am

1 stop17h 35m

Houston George Bush Intcntl

Thu 11/20

8:36 pm-8:07 pm

2 stops22h 31m

$314

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Sun 9/28

7:36 pm-5:01 pm

2 stops22h 25m

Houston George Bush Intcntl

Sun 10/5

5:04 pm-1:45 pm

1 stop19h 41m

$318

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Thu 11/20

10:02 am-6:23 pm

1 stop9h 21m

Houston George Bush Intcntl

Wed 12/3

9:05 pm-8:14 pm

1 stop22h 09m

$321

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 25 results
1
2
3

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 to Houston?

Currently, September is the cheapest month in which you can book a flight from Islip to Houston (average of $230). Flying from Islip to Houston in March is currently the most expensive (average of $330). 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 September 17, 2025.

It’s optimal to fly from Islip 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 September 17, 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
4,242 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • How long is the flight from Islip to Houston?

    For as low as $254, Frontier can have you in Houston from Islip in 7h 50m. Airlines will cover a distance of 1462 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Islip to Houston round-trip?

    Cheapflights users have booked flights from Islip to Houston round-trip from $343. This flight start at 20% lower than the current average price 3 months from now.

  • 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 to Houston?

    Currently, September is the cheapest month in which you can book a flight from Islip to Houston (average of $230). Flying from Islip to Houston in March is currently the most expensive (average of $330). 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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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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$343Average$476FlexibilityNo cancel feeOn-time63%

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