$139 Cheap Flights from Houston (HOU) to St. Louis (STL)

View $139 flight on Tue, Sep 16, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $139 for one-way flights and $277 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, Dec 16 - Wed, Jan 7
HOU
Houston
STL
St. Louis
$277 Roundtrip, found 10 hours ago
$277
Roundtrip
found 10 hours ago
Select Southwest Airlines flight, departing Tue, Dec 16 from Houston to St. Louis, returning Wed, Jan 7, priced at $277 found 10 hours ago
American Airlines
Wed, Sep 17 - Mon, Sep 22
HOU
Houston
STL
St. Louis
$290 Roundtrip, found 2 days ago
$290
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Sep 17 from Houston to St. Louis, returning Mon, Sep 22, priced at $290 found 2 days ago

Find the cheapest month to fly from Houston (HOU) to St. Louis (STL)

September is typically the cheapest month to fly

From $116 - $394 per traveler.

Graph displaying average flight prices per month

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $164
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $164
Flights from Houston (HOU) to St. Louis (STL)
Origin airport
William P. Hobby
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines
Roundtrip price
$277
Distance
687 mi
Average flight time
2 hours 54 mins

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 December. 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 $139 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?
Get a cheap one-way flight from $139 or cheap return flight from $277 from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from HOU to STL is December, when there's less demand. Off-peak season is often when you'll find lower airfares between these airports.
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 William P. Hobby Airport (HOU) to Lambert-St. Louis Intl. Airport (STL)?
Use the filter tool on Expedia to compare different airlines and find the cheapest carrier that'll take you from HOU to STL. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
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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*Available to One Key members.