$110 Cheap Flights from St. Louis (STL) to Houston (IAH)

View $110 flight on Sun, May 11, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to George Bush Intercontinental Airport (IAH)

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Find available prices by choosing your travel dates.

Cheap Flights from St. Louis to Houston (STL-IAH)

Prices were available within the past 7 days and start at $110 for one-way flights and $198 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, May 31 - Sun, Jun 1
STL
St. Louis
IAH
Houston
$198 Roundtrip, found 1 day ago
$198
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, May 31 from St. Louis to Houston, returning Sun, Jun 1, priced at $198 found 1 day ago
Frontier Airlines
Thu, May 8 - Mon, May 12
STL
St. Louis
IAH
Houston
$208 Roundtrip, found 9 hours ago
$208
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Thu, May 8 from St. Louis to Houston, returning Mon, May 12, priced at $208 found 9 hours ago
Frontier Airlines
Fri, May 30 - Sat, May 31
STL
St. Louis
IAH
Houston
$218 Roundtrip, found 1 day ago
$218
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, May 30 from St. Louis to Houston, returning Sat, May 31, priced at $218 found 1 day ago
Frontier Airlines
Thu, May 1 - Mon, May 5
STL
St. Louis
IAH
Houston
$228 Roundtrip, found 3 hours ago
$228
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Thu, May 1 from St. Louis to Houston, returning Mon, May 5, priced at $228 found 3 hours ago
United
Wed, May 14 - Sat, May 24
STL
St. Louis
IAH
Houston
$230 Roundtrip, just found
$230
Roundtrip
just found
Select United flight, departing Wed, May 14 from St. Louis to Houston, returning Sat, May 24, priced at $230 just found
Frontier Airlines
Tue, May 6 - Sun, May 25
STL
St. Louis
IAH
Houston
$230 Roundtrip, found 6 days ago
$230
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Tue, May 6 from St. Louis to Houston, returning Sun, May 25, priced at $230 found 6 days ago
United
Sat, May 24 - Tue, Jun 3
STL
St. Louis
IAH
Houston
$236 Roundtrip, just found
$236
Roundtrip
just found
Select United flight, departing Sat, May 24 from St. Louis to Houston, returning Tue, Jun 3, priced at $236 just found
Delta
Wed, May 14 - Sat, May 24
STL
St. Louis
IAH
Houston
$240 Roundtrip, just found
$240
Roundtrip
just found
Select Delta flight, departing Wed, May 14 from St. Louis to Houston, returning Sat, May 24, priced at $240 just found
American Airlines
Sat, May 24 - Tue, Jun 3
STL
St. Louis
IAH
Houston
$245 Roundtrip, just found
$245
Roundtrip
just found
Select American Airlines flight, departing Sat, May 24 from St. Louis to Houston, returning Tue, Jun 3, priced at $245 just found
Spirit Airlines
Fri, Sep 5 - Sun, Sep 7
STL
St. Louis
IAH
Houston
$309 Roundtrip, found 1 day ago
$309
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Fri, Sep 5 from St. Louis to Houston, returning Sun, Sep 7, priced at $309 found 1 day ago
Flights from St. Louis (STL) to Houston (IAH)
Origin airport
Lambert-St. Louis Intl.
Destination airport
George Bush Intercontinental
Airlines serving
American Airlines, Delta, Frontier Airlines, Spirit Airlines, United
Roundtrip price
$198
Distance
667 mi
Average flight time
2 hours 20 mins

St. Louis to Houston Flights

The cheapest times to fly from St. Louis to Houston

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Houston are during the month of May. You can find some of the cheapest flights from St. Louis to Houston with Expedia's search tool and vast selection of airlines.

The best time to book a flight from St. Louis to Houston

Sunday is one of the best days to book for cheap flights from St. Louis to Houston: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from St. Louis to Houston

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Houston in 2025. You can also book with separate airlines for your outbound and return journeys, from $110 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Houston flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Houston airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH) cost?
Score affordable return tickets from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH) starting at $220. Book your seat and start your adventure. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a United flight leaving STL on May 20 2025 and touching down at IAH. The price was last updated on April 23 2025 and has not changed since.
What is the cheapest month to fly from STL to IAH?
The cheapest flights from STL to IAH are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH)?
You can travel nonstop from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH) on a United Airlines flight.
What is the cheapest airline that flies from STL to IAH?
Right now, the cheapest carrier operating one-way flights from STL to IAH is United. You can jet off on this route from $136. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from STL on July 4 2025. Prices were last updated on April 23 2025 and have not changed since.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH)?
Each day on average, 2 direct flights take off from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH). Choose the departure that best suits your plans.
What are the most popular departure times for flights from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH)?
The 6 AM departures from STL to IAH see the highest demand. They can also be more expensive. If you want to save on your trip, pick a less crowded time to fly.
What day of the week has the most flights from STL to IAH?
If you travel on a Friday, you’ll get the biggest range of choices for flights from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH).
What is the earliest flight from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH)?
The earliest flight taking off from Lambert-St. Louis Intl. Airport (STL) is at around 6:15AM UTC-6. Catch this flight and you’ll land at George Bush Intercontinental Airport (IAH) at approximately 8:40AM UTC-6. The total travel time is 2h 25m.
How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH)?
The average flight time from STL to IAH is 2 hours and 23 minutes, covering a distance of 670 mi.
What airline has the least delays from STL to IAH?
Consider traveling with United Airlines if you’d like to go straight from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH) without any interruptions. This carrier has the best track record for punctuality, with an on-time score of 82%. Want to be notified if anything changes? You can keep an eye on your flight status using the Expedia App.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH)?
To avoid possible delays on the Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH) route, fly before 3 PM. Flights after this time have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Houston from Lambert-St. Louis Intl. Airport (STL)?
Catch a direct flight from Lambert-St. Louis Intl. Airport (STL) to Houston and land at George Bush Intercontinental Airport (IAH). Another convenient arrival point to this city is William P. Hobby Airport (HOU).
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH) last-minute?
Holding off until just before your trip to book a ticket from STL to IAH often results in higher prices. Although you may find some last-minute discounts, there’s no guarantee. Keep your travel plans flexible to boost your chances of getting a bargain.
Is it cheaper to book a STL to IAH flight and hotel package?
You’ll generally save money by booking a STL to IAH flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it’s easy to manage everything in one convenient place. After selecting your ideal accommodations and flights, consider adding extras like car rentals, tours and activities.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to George Bush Intercontinental Airport (IAH)?
In most instances, you’re able to cancel or reschedule your STL to IAH flight. However, additional charges may apply, especially if you made your booking over 24 hours ago. Double-check your itinerary for the airline’s policies and fees on flight changes, or if you’d like more information, go to our Customer Service portal.

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