HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$150+ 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 11/4. Fares are subject to change and may not be available on all flights or dates of travel.
HOU — ISP
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Houston to Islip 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 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 September 11, 2025.

Round-trip from

$152
(Priceline)

One-way from

$150
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$195
From Houston to Islip Long Island
Search Deals
One-way flight from Houston to Islip Long Island
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 11, 2025.

This Priceline deal was found by Cheapflights users on 9/11. 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 9/259:10 pmIAH - ISP
1 stop10h 54mFrontier
Sun 9/289:49 amISP - IAH
1 stop7h 20mFrontier
Deal found 9/11$152
This Frontier deal was found by Cheapflights users on 9/10. 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 10/248:37 pmIAH - ISP
1 stop13h 00mFrontier
Sun 10/269:47 pmISP - IAH
1 stop10h 17mFrontier
Deal found 9/10$158
This Frontier deal was found by Cheapflights users on 9/10. 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 10/29:20 pmIAH - ISP
1 stop10h 44mFrontier
Sun 10/59:49 amISP - IAH
1 stop7h 20mFrontier
Deal found 9/10$162
This Frontier deal was found by Cheapflights users on 9/11. 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.
Mon 9/2911:39 amIAH - ISP
1 stop22h 01mFrontier
Mon 10/65:05 pmISP - IAH
1 stop18h 42mFrontier
Deal found 9/11$185
This Frontier deal was found by Cheapflights users on 9/11. 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 9/189:10 pmIAH - ISP
1 stop10h 54mFrontier
Sun 9/219:49 amISP - IAH
1 stop7h 20mFrontier
Deal found 9/11$221
This Booking.com deal was found by Cheapflights users on 9/10. 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.
Thu 9/189:10 pmIAH - ISP
1 stop10h 54mFrontier
Sat 9/205:18 pmISP - IAH
1 stop23h 51mFrontier
Deal found 9/10$231
This Southwest deal was found by Cheapflights users on 9/9. 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 11/255:20 amHOU - ISP
1 stop5h 35mSouthwest
Sat 11/296:05 pmISP - HOU
1 stop7h 00mSouthwest
Deal found 9/9$477

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 September 11, 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

Thu 10/2

9:20 pm-9:04 am

1 stop10h 44m

Islip Long Island

Sun 10/5

9:49 am-4:09 pm

1 stop7h 20m

$162

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Thu 9/25

11:44 am-10:40 am

1 stop21h 56m

Islip Long Island

Sun 9/28

11:25 am-10:39 am

2 stops24h 14m

$202

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Fri 10/24

8:37 pm-10:37 am

1 stop13h 00m

Islip Long Island

Sun 10/26

9:47 pm-7:04 am

1 stop10h 17m

$271

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Mon 9/29

5:47 pm-10:40 am

2 stops15h 53m

Islip Long Island

Mon 10/6

2:32 pm-4:47 pm

2 stops27h 15m

$279

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Wed 9/24

4:36 pm-10:55 am

1 stop17h 19m

Islip Long Island

Sat 9/27

5:05 pm-11:09 am

2 stops43h 04m

$283

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Sun 12/14

7:08 pm-9:11 am

1 stop13h 03m

Islip Long Island

Tue 12/16

8:09 pm-8:54 am

1 stop13h 45m

$315

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Thu 12/11

7:08 pm-9:11 am

1 stop13h 03m

Islip Long Island

Sun 12/14

9:09 pm-8:54 am

1 stop12h 45m

$326

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Wed 10/8

5:42 pm-9:04 am

2 stops14h 22m

Islip Long Island

Sun 10/12

9:44 am-4:38 pm

1 stop7h 54m

$331

HoustonIslip

HOU - ISP

HOUISP

Houston Hobby

Tue 11/25

5:20 am-11:55 am

1 stop5h 35m

Islip Long Island

Sat 11/29

6:05 pm-12:05 am

1 stop7h 00m

$477

HoustonIslip

IAH - ISP

IAHISP

Houston George Bush Intcntl

Thu 12/4

12:28 pm-8:14 pm

1 stop6h 46m

$156

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 17 results
1
2

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 September 11, 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 September 11, 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
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

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 35m. Your travel time can differ by up to 5h 09m. 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 $336.

  • 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

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
Southampton

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 Houston to Islip

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

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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$336Average$511FlexibilityNo 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.