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Islip

$85+ Cheap flights from Houston to Islip (ISP)

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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
HOU — ISP
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
1 adult, Economy
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Cheap flight deals from Houston to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Houston (HO1) to Islip (ISP). 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 20, 2025.

Round-trip from

$176
(FlightHub)

One-way from

$85
(Frontier)

Popular in

December

Cheapest in

September

Average price

$263
From Houston to Islip Long Island
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One-way flight from Houston to Islip Long Island
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Highest demand for flights based on searches. 5% potential increase in price ($14 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 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 Houston to Islip

Cheapest flights from Houston to Islip
Explore the most affordable flight options available from Houston to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.

This FlightHub deal was found by Cheapflights users on 8/18. 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.
Tue 9/94:36 pmIAH - ISP
1 stop17h 04mFrontier
Tue 9/2311:25 amISP - IAH
1 stop29h 11mFrontier
Deal found 8/18$176
This Kiwi.com deal was found by Cheapflights users on 8/18. 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.
Tue 9/912:47 pmIAH - ISP
2 stops20h 53mMultiple Airlines
Tue 9/2311:25 amISP - IAH
1 stop29h 11mMultiple Airlines
Deal found 8/18$181
This Frontier deal was found by Cheapflights users on 8/18. 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 9/269:08 pmIAH - ISP
2 stops12h 47mFrontier
Sun 9/289:49 amISP - IAH
1 stop7h 20mFrontier
Deal found 8/18$204
This FlightHub deal was found by Cheapflights users on 8/18. 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.
Mon 9/1511:39 amIAH - ISP
1 stop22h 01mFrontier
Thu 9/1811:40 amISP - IAH
1 stop28h 24mFrontier
Deal found 8/18$209
This Kiwi.com deal was found by Cheapflights users on 8/19. 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 9/65:48 pmIAH - ISP
1 stop16h 02mMultiple Airlines
Sat 9/135:05 pmISP - IAH
1 stop16h 19mMultiple Airlines
Deal found 8/19$217
This FlightHub deal was found by Cheapflights users on 8/19. 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 8/204:43 pmIAH - ISP
1 stop24h 55mFrontier
Wed 8/278:00 amISP - IAH
1 stop8h 40mFrontier
Deal found 8/19$225
This Frontier deal was found by Cheapflights users on 8/18. 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 8/281:29 pmIAH - ISP
1 stop9h 30mFrontier
Wed 9/38:00 amISP - IAH
1 stop8h 40mFrontier
Deal found 8/18$228
This Frontier deal was found by Cheapflights users on 8/18. 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 10/39:08 pmIAH - ISP
2 stops12h 47mFrontier
Sun 10/59:49 amISP - IAH
1 stop7h 20mFrontier
Deal found 8/18$232
This Cheapflightsfares deal was found by Cheapflights users on 8/19. 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.
Tue 9/24:43 pmIAH - ISP
1 stop6h 16mFrontier
Fri 9/59:49 amISP - IAH
1 stop6h 50mFrontier
Deal found 8/19$236
This Southwest deal was found by Cheapflights users on 8/18. 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.
Tue 9/95:55 amHOU - ISP
1 stop5h 00mSouthwest
Tue 9/234:00 pmISP - HOU
1 stop6h 30mSouthwest
Deal found 8/18$237
This Frontier deal was found by Cheapflights users on 8/19. 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 10/108:37 pmIAH - ISP
1 stop13h 00mFrontier
Mon 10/139:49 amISP - IAH
1 stop7h 54mFrontier
Deal found 8/19$238
This Southwest deal was found by Cheapflights users on 8/17. 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.
Sat 9/2711:00 amHOU - ISP
2 stops9h 40mSouthwest
Sat 10/113:10 pmISP - HOU
1 stop8h 05mSouthwest
Deal found 8/17$246

Cheapflights Fare Finder

 
Customize your flight search to find flights from Houston to Islip 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 20, 2025.
Use the filters below to find and compare flights from Houston to Islip that are best for you.

Fly from

Houston

Fly to

Islip

Route

Depart

Return

Price

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Tue 9/9

4:36 pm-10:40 am

1 stop17h 04m

Islip Long Island

Tue 9/23

11:25 am-3:36 pm

1 stop29h 11m

$176

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Tue 9/9

12:47 pm-10:40 am

2 stops20h 53m

Islip Long Island

Tue 9/23

11:25 am-3:36 pm

1 stop29h 11m

$181

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Fri 9/26

9:08 pm-10:55 am

2 stops12h 47m

Islip Long Island

Sun 9/28

9:49 am-4:09 pm

1 stop7h 20m

$204

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Mon 9/15

11:39 am-10:40 am

1 stop22h 01m

Islip Long Island

Thu 9/18

11:40 am-3:04 pm

1 stop28h 24m

$209

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Sat 9/6

5:48 pm-10:50 am

1 stop16h 02m

Islip Long Island

Sat 9/13

5:05 pm-8:24 am

1 stop16h 19m

$217

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Sat 9/6

4:36 pm-10:50 am

1 stop17h 14m

Islip Long Island

Sat 9/13

5:18 pm-4:09 pm

1 stop23h 51m

$225

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Sun 8/31

1:29 pm-11:59 pm

1 stop9h 30m

Islip Long Island

Tue 9/2

6:05 am-3:40 pm

1 stop10h 35m

$228

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Sun 8/31

1:29 pm-11:59 pm

1 stop9h 30m

Islip Long Island

Wed 9/3

8:00 am-3:40 pm

1 stop8h 40m

$228

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Fri 10/3

9:08 pm-10:55 am

2 stops12h 47m

Islip Long Island

Sun 10/5

9:49 am-4:09 pm

1 stop7h 20m

$232

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Fri 9/12

9:08 pm-10:55 am

2 stops12h 47m

Islip Long Island

Sun 9/14

9:49 am-4:09 pm

1 stop7h 20m

$232

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Showing 1-10 of 26 results
1
2
3

Best time to book a flight from Houston to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Houston 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 Houston to Islip

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

Currently, January is the cheapest month in which you can book a flight from Houston to Islip (average of $108). Flying from Houston to Islip in November is currently the most expensive (average of $213). 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 HOU to ISP?

Find hourly flight availability from Houston to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 20, 2025.

When flying from Houston to Islip, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 2% versus a flight in the morning.

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. 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 Islip. Reviews last updated August 20, 2025.
See what other customers who have flown with Southwest from Houston to Islip have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

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
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

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 Houston to Islip. 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 into for flights to Islip from Houston?

    For a flight from Houston to Islip, you will be flying into 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 inbound flights from Houston per day. 1 airline has flights to Islip Long Island from Houston on a regular basis.

  • How long is the flight from Houston to Islip?

    Frontier and Southwest can get you from Houston to Islip in just under 5h. Your travel time can differ by up to 12h 04m. Airlines will cover a distance of 1462 mi. This flight may include one or multiple stops.

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

    Flying on Southwest is currently your cheapest option to Islip, with prices starting at $349.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Houston to Islip 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 Houston to Islip?

    Currently, January is the cheapest month in which you can book a flight from Houston to Islip (average of $108). Flying from Houston to Islip in November is currently the most expensive (average of $213). 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 Houston to Islip

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Houston to Islip

Discover the top airline that operate flights from Houston to Islip. 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 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$349Average$456FlexibilityNo cancel feeOn-time63%

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