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$137+ 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 5/17. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — HOU
May 5 — May 121
Mon 5/5
Mon 5/12
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 April 30, 2025.

Round-trip from

$261
(CheapOair)

One-way from

$137
(CheapOair)

Popular in

April

Cheapest in

January

Average price

$790
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. 24% potential increase in price ($149 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 30, 2025.

This CheapOair deal was found by Cheapflights users on 4/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/137:15 pmISP - IAH
1 stop16h 22mFrontier
Wed 5/149:05 pmIAH - ISP
1 stop12h 07mFrontier
Deal found 4/29$261
This Southwest deal was found by Cheapflights users on 4/29. 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.
Fri 8/223:05 pmISP - HOU
1 stop6h 45mSouthwest
Sun 8/2410:30 amHOU - ISP
1 stop5h 30mSouthwest
Deal found 4/29$337
This Mytrip deal was found by Cheapflights users on 4/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/233:59 pmISP - IAH
3 stops33h 08mMultiple Airlines
Mon 5/268:44 pmIAH - ISP
3 stops15h 31mMultiple Airlines
Deal found 4/29$592

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 April 30, 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

Tue 5/13

7:15 pm-10:37 am

1 stop16h 22m

Houston George Bush Intcntl

Wed 5/14

9:05 pm-10:12 am

1 stop12h 07m

$261

IslipHouston

ISP - HOU

ISPHOU

Islip Long Island

Fri 5/23

5:00 am-12:05 pm

1 stop8h 05m

Houston Hobby

Mon 5/26

5:10 am-12:15 pm

1 stop6h 05m

$452

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Fri 5/23

3:59 pm-12:07 am

3 stops33h 08m

Houston George Bush Intcntl

Mon 5/26

8:44 pm-1:15 pm

3 stops15h 31m

$592

IslipHouston

ISP - IAH

ISPIAH

Islip Long Island

Sat 5/17

7:15 pm-10:37 am

1 stop16h 22m

$137

IslipHouston

ISP - HOU

ISPHOU

Islip Long Island

Sun 7/13

6:00 pm-11:20 pm

1 stop6h 20m

$234

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

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 April 30, 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.

Rainfall in Houston by month

Plan your trip to Houston by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Houston ranges from 3.2 - 5.9 inches per month. June is typically the wettest month, when rainfall can reach 5.9 in. February is typically the driest time to visit Houston when rainfall is around 3.2 in.

Temperature in Houston by month

Plan your trip to Houston by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Houston, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 53.6 F).

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 April 30, 2025.
To help decide which airline to fly from Islip to Houston, see what other customers have to say about Southwest and Frontier. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,295 reviews

Comfort

8.0

Food

7.1

Entertainment

7.6

Crew

8.6

Boarding

8.2

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
4,295 reviews
Southwest
8.0
Very good
4,295 reviews

Comfort

8.0

Food

7.1

Entertainment

7.6

Crew

8.6

Boarding

8.2

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.
Frontier
6.0
Okay
3,287 reviews
Southwest
8.0
Very good
4,295 reviews

Comfort

8.0

Food

7.1

Entertainment

7.6

Crew

8.6

Boarding

8.2

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 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?

    Frontier, at $261, was found to be the cheapest airline from Islip, New York to Houston. An alternate airline flying to your destination would be Southwest. Frontier is currently priced 43% 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

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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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$376Average$476FlexibilityNo cancel feeOn-time63%

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