$75 Cheap Flights from Houston (IAH) to St. Louis (STL)

View $75 flight on Thu, Sep 25, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $75 for one-way flights and $149 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Thu, Aug 14 - Mon, Aug 25
IAH
Houston
STL
St. Louis
$149 Roundtrip, found 3 hours ago
$149
Roundtrip
found 3 hours ago
Select Spirit Airlines flight, departing Thu, Aug 14 from Houston to St. Louis, returning Mon, Aug 25, priced at $149 found 3 hours ago
Spirit Airlines
Mon, Aug 18 - Wed, Aug 20
IAH
Houston
STL
St. Louis
$154 Roundtrip, found 10 hours ago
$154
Roundtrip
found 10 hours ago
Select Spirit Airlines flight, departing Mon, Aug 18 from Houston to St. Louis, returning Wed, Aug 20, priced at $154 found 10 hours ago
Spirit Airlines
Thu, Sep 18 - Mon, Sep 22
IAH
Houston
STL
St. Louis
$158 Roundtrip, found 1 day ago
$158
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Thu, Sep 18 from Houston to St. Louis, returning Mon, Sep 22, priced at $158 found 1 day ago
Spirit Airlines
Thu, Sep 4 - Thu, Sep 11
IAH
Houston
STL
St. Louis
$159 Roundtrip, found 2 days ago
$159
Roundtrip
found 2 days ago
Select Spirit Airlines flight, departing Thu, Sep 4 from Houston to St. Louis, returning Thu, Sep 11, priced at $159 found 2 days ago
Spirit Airlines
Thu, Sep 25 - Sun, Sep 28
IAH
Houston
STL
St. Louis
$164 Roundtrip, just found
$164
Roundtrip
just found
Select Spirit Airlines flight, departing Thu, Sep 25 from Houston to St. Louis, returning Sun, Sep 28, priced at $164 just found
Frontier Airlines
Thu, Oct 2 - Mon, Oct 6
IAH
Houston
STL
St. Louis
$167 Roundtrip, found 17 hours ago
$167
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Thu, Oct 2 from Houston to St. Louis, returning Mon, Oct 6, priced at $167 found 17 hours ago
United
Wed, Sep 17 - Sun, Sep 21
IAH
Houston
STL
St. Louis
$169 Roundtrip, found 17 hours ago
$169
Roundtrip
found 17 hours ago
Select United flight, departing Wed, Sep 17 from Houston to St. Louis, returning Sun, Sep 21, priced at $169 found 17 hours ago
United
Thu, Aug 14 - Mon, Aug 25
IAH
Houston
STL
St. Louis
$173 Roundtrip, found 3 hours ago
$173
Roundtrip
found 3 hours ago
Select United flight, departing Thu, Aug 14 from Houston to St. Louis, returning Mon, Aug 25, priced at $173 found 3 hours ago
Delta
Wed, Sep 17 - Sun, Sep 21
IAH
Houston
STL
St. Louis
$179 Roundtrip, found 17 hours ago
$179
Roundtrip
found 17 hours ago
Select Delta flight, departing Wed, Sep 17 from Houston to St. Louis, returning Sun, Sep 21, priced at $179 found 17 hours ago
American Airlines
Thu, Aug 14 - Mon, Aug 25
IAH
Houston
STL
St. Louis
$183 Roundtrip, found 3 hours ago
$183
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Thu, Aug 14 from Houston to St. Louis, returning Mon, Aug 25, priced at $183 found 3 hours ago

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

August is typically the cheapest month to fly

From $110 - $375 per traveler.

Graph displaying average flight prices per month

Flights from Houston (IAH) to St. Louis (STL)
Origin airport
George Bush Intercontinental
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Spirit Airlines, United
Roundtrip price
$149
Distance
667 mi
Average flight time
2 hours 13 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 August. 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 $75 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 George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL) cost?
Book cheap return fares starting at $197 from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL). 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 IAH on July 27 2025 and touching down at STL. The price was last updated on July 2 2025 and has not changed since.
What is the cheapest month to fly from IAH to STL?
The cheapest flights from IAH 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 George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
If you're departing from George Bush Intercontinental Airport (IAH), you can catch a nonstop flight to Lambert-St. Louis Intl. Airport (STL) with United Airlines.
What is the cheapest airline that flies from IAH to STL?
Fly from IAH to STL with United. This airline currently has the lowest one-way fare on this route, starting at $99. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from IAH on September 24 2025. Prices were last updated on July 2 2025 and have not changed since.
How many flights per day from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
When taking off from George Bush Intercontinental Airport (IAH), you can choose from an average of 2 daily nonstop flights to Lambert-St. Louis Intl. Airport (STL).
What are the most popular departure times for flights from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
Flights between IAH and STL tend to be busiest at 12 PM. For a more relaxed experience and potentially cheaper tickets, choose a departure outside the usual busy windows.
What day of the week has the most flights from IAH to STL?
Sunday offers the most flights from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL). Consider leaving on this day and you'll have a greater chance of finding a schedule that works for you.
What is the earliest flight from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
George Bush Intercontinental Airport (IAH)'s earliest flight to Lambert-St. Louis Intl. Airport (STL) takes off at approximately 7:45AM UTC-6. With a total flight time of 2h 10m, you'll arrive at around 9:55AM UTC-6.
How long does it take to fly from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
The average flight time from IAH to STL is 2 hours and 8 minutes, covering a distance of 670 mi.
What airline has the least delays from IAH to STL?
With 82% of journeys generally arriving on schedule, United Airlines has the best on-time performance for direct flights from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL). To check your flight status and get notifications if anything changes, simply head to the Expedia App.
What is the best time to fly from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
To reach Lambert-St. Louis Intl. Airport (STL) on time, book a flight that leaves George Bush Intercontinental Airport (IAH) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 George Bush Intercontinental Airport (IAH)?
If you're taking a direct flight from George Bush Intercontinental Airport (IAH) to St. Louis, Lambert-St. Louis Intl. Airport (STL) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Waiting until right before your break to book a flight from IAH to STL generally means paying more. While it's possible to find some last-minute deals, they aren't always guaranteed. Be flexible with your itinerary for the best chance of scoring a bargain.
Is it cheaper to book an IAH to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking an IAH to STL flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one place will take the stress out of travel planning. Simply pick your flights and choose from our extensive range of hotels, then tailor your trip with other add-ons like car rentals and activities.
Can I cancel or change the date of my flight from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
It's usually possible to cancel or reschedule your IAH to STL flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more information on our Customer Service portal.

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