$104 Cheap Flights from Houston (HOU) to St. Louis (STL)

View $104 flight on Sat, May 24, 2025Opens in a new window

Popular airlines from Houston William Hobby Airport (HOU) to St. Louis Lambert Intl. Airport (STL)

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Find available prices by choosing your travel dates.

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

Prices were available within the past 7 days and start at $104 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
Mon, May 12 - Tue, May 13
IAH
Houston
STL
St. Louis
$198 Roundtrip, found 1 day ago
$198
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Mon, May 12 from Houston to St. Louis, returning Tue, May 13, priced at $198 found 1 day ago
Frontier Airlines
Tue, May 20 - Tue, May 27
IAH
Houston
STL
St. Louis
$221 Roundtrip, found 2 days ago
$221
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Tue, May 20 from Houston to St. Louis, returning Tue, May 27, priced at $221 found 2 days ago
Frontier Airlines
Sat, May 24 - Tue, May 27
IAH
Houston
STL
St. Louis
$230 Roundtrip, found 1 day ago
$230
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, May 24 from Houston to St. Louis, returning Tue, May 27, priced at $230 found 1 day ago
Frontier Airlines
Tue, May 20 - Fri, May 23
IAH
Houston
STL
St. Louis
$230 Roundtrip, found 2 days ago
$230
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Tue, May 20 from Houston to St. Louis, returning Fri, May 23, priced at $230 found 2 days ago
Frontier Airlines
Thu, Jun 5 - Sat, Aug 16
IAH
Houston
STL
St. Louis
$231 Roundtrip, found 1 day ago
$231
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Jun 5 from Houston to St. Louis, returning Sat, Aug 16, priced at $231 found 1 day ago
Frontier Airlines
Sat, May 24 - Wed, May 28
IAH
Houston
STL
St. Louis
$240 Roundtrip, found 4 hours ago
$240
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Sat, May 24 from Houston to St. Louis, returning Wed, May 28, priced at $240 found 4 hours ago
Southwest Airlines
Sat, May 24 - Mon, Jun 2
HOU
Houston
STL
St. Louis
$267 Roundtrip, found 6 hours ago
$267
Roundtrip
found 6 hours ago
Select Southwest Airlines flight, departing Sat, May 24 from Houston to St. Louis, returning Mon, Jun 2, priced at $267 found 6 hours ago
United
Sun, May 25 - Tue, May 27
IAH
Houston
STL
St. Louis
$271 Roundtrip, found 4 hours ago
$271
Roundtrip
found 4 hours ago
Select United flight, departing Sun, May 25 from Houston to St. Louis, returning Tue, May 27, priced at $271 found 4 hours ago
American Airlines
Wed, Jul 2 - Thu, Jul 3
IAH
Houston
STL
St. Louis
$275 Roundtrip, found 6 hours ago
$275
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Wed, Jul 2 from Houston to St. Louis, returning Thu, Jul 3, priced at $275 found 6 hours ago
Delta
Sun, May 25 - Tue, May 27
IAH
Houston
STL
St. Louis
$291 Roundtrip, found 4 hours ago
$291
Roundtrip
found 4 hours ago
Select Delta flight, departing Sun, May 25 from Houston to St. Louis, returning Tue, May 27, priced at $291 found 4 hours ago
Flights from Houston (IAH) to St. Louis (STL)
Origin airport
George Bush Intercontinental
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines
Roundtrip price
$198
Distance
667 mi

Houston to St. Louis Flights

The cheapest times to fly from Houston to St. Louis

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 Houston to St. Louis are during the month of May. You can find some of the cheapest flights from Houston to St. Louis with Expedia's search tool and vast selection of airlines.

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

Sunday is one of the best days to book for cheap flights from Houston to St. Louis: 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 Houston to St. Louis

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 Houston to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $104 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 Houston to St. Louis 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 Houston to St. Louis 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 William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL) cost?
Score cheap return flights from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL) starting at $271. Grab your seat and be on your way. 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 Southwest Airlines flight leaving HOU on May 14 2025 and touching down at STL. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from HOU to STL?
The cheapest flights from HOU to STL 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 William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL)?
Take a direct flight with Southwest Airlines and fly straight from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL).
What is the cheapest airline that flies from HOU to STL?
At the moment, the cheapest carrier operating one-way flights from HOU to STL is Southwest Airlines. You can book a seat 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 HOU on June 11 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL)?
With, on average, 3 direct flights that operate from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL) daily, you’ll be soaring through the skies in no time.
What are the most popular departure times for flights from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL)?
More travelers fly between HOU and STL at 6 AM than at any other point in the day. Rather go when it’s quieter? Pick a flight outside the busiest times and you could save on your ticket as well.
What day of the week has the most flights from HOU to STL?
Fly on a Friday if you’re searching for the best choice of flights from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL).
What is the earliest flight from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL)?
The earliest flight out of William P. Hobby Airport (HOU) is at around 5:30AM UTC-6. Board this flight and you’ll reach Lambert-St. Louis Intl. Airport (STL) at approximately 7:25AM UTC-6. The total flight duration is 1h 55m.
How long does it take to fly from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL)?
Flights from HOU to STL have an average travel time of 1 hour and 56 minutes. The distance between the two is 690 mi.
What airline has the least delays from HOU to STL?
With 85% of flights typically landing on time, Southwest Airlines has the best on-time performance for nonstop flights from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL). To monitor your flight status and get notified if anything changes, head to the Expedia App.
What is the best time to fly from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL) route, travel before 3 PM. Later departures have a 22% higher chance of being canceled.**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 St. Louis from William P. Hobby Airport (HOU)?
Browse your flight options from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL). This is the only St. Louis airport you can land at if you’re taking a direct flight.
Is it cheaper to buy a plane ticket from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until right before your break to book a ticket from HOU to STL generally means paying more. While you might find some last-minute discounts, they’re not always guaranteed. Keep your travel plans flexible to maximize your chances of landing a bargain.
Is it cheaper to book a HOU to STL flight and hotel package?
Securing a HOU to STL flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Select from our impressive range of accommodations and then add car rentals, activities and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL)?
In most instances, you can cancel or modify your HOU to STL flight. However, additional fees may apply, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline’s fees and policies on flight changes, or if you need more information, head to our Customer Service portal.

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