$139 Cheap United flights Houston (IAH) to St. Louis (STL)

View $139 flight on Tue, Sep 23, 2025Opens in a new window

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$139 Cheap United flights Houston (IAH) to St. Louis (STL)

Prices were available within the past 7 days and start at $139 for one-way flights and $221 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Sep 23 - Thu, Sep 25
IAH
Houston
STL
St. Louis
$221 Roundtrip, found 3 hours ago
$221
Roundtrip
found 3 hours ago
Select United flight, departing Tue, Sep 23 from Houston to St. Louis, returning Thu, Sep 25, priced at $221 found 3 hours ago
United
Tue, Oct 14 - Fri, Oct 17
IAH
Houston
STL
St. Louis
$246 Roundtrip, found 5 days ago
$246
Roundtrip
found 5 days ago
Select United flight, departing Tue, Oct 14 from Houston to St. Louis, returning Fri, Oct 17, priced at $246 found 5 days ago
United
Fri, Nov 7 - Sun, Nov 9
IAH
Houston
STL
St. Louis
$250 Roundtrip, just found
$250
Roundtrip
just found
Select United flight, departing Fri, Nov 7 from Houston to St. Louis, returning Sun, Nov 9, priced at $250 just found
United
Fri, Oct 31 - Mon, Nov 3
IAH
Houston
STL
St. Louis
$253 Roundtrip, found 3 hours ago
$253
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Oct 31 from Houston to St. Louis, returning Mon, Nov 3, priced at $253 found 3 hours ago
United
Tue, Sep 16 - Thu, Sep 18
IAH
Houston
STL
St. Louis
$257 Roundtrip, found 3 days ago
$257
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 16 from Houston to St. Louis, returning Thu, Sep 18, priced at $257 found 3 days ago
United
Wed, Oct 8 - Sun, Oct 12
IAH
Houston
STL
St. Louis
$262 Roundtrip, found 3 hours ago
$262
Roundtrip
found 3 hours ago
Select United flight, departing Wed, Oct 8 from Houston to St. Louis, returning Sun, Oct 12, priced at $262 found 3 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, Frontier Airlines, Spirit Airlines, United
Popular airline
American Airlines
Distance
667 mi
Average flight time
2 hours 10 mins

Frequently asked questions

How much is a United Airlines flight from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
Apply the "Price (lowest to highest)" filter on Expedia to find cheap United Airlines return flights from $221 from IAH to STL. Affordable one-way fares from $139 are available too.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from IAH to STL with United Airlines?
January is one of the least expensive months to get away to St. Louis with United Airlines. You could also find fantastic deals on return and one-way fares in February.
What is the cheapest time to book flights from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL) with United Airlines?
Start searching one to three months ahead of your departure date to find cheap fares on United Airlines flights from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Time it well, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
Book a seat on one of United Airlines's 20 weekly direct flights from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL). To see what's available, enter your dates, origin and destination and hit search. Next, apply the "Nonstop" and "Airline" filters.
How long does it take to fly from IAH to STL with United Airlines?
Depart George Bush Intercontinental Airport (IAH) for Lambert-St. Louis Intl. Airport (STL) on a direct United Airlines flight, and you'll be airborne for around 2h 8m.
Which day of the week has the most United Airlines flights from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
United Airlines has the most flights from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL) on Saturday. With up to 3 daily departures, you'll get the most flexibility on this day.
What is the earliest United Airlines flight from IAH to STL?
Jetting off from IAH at 7:45AM UTC-6, the earliest United Airlines flight to STL lands at 9:55AM UTC-6. Traveling earlier in the day means you'll be less likely to experience cancellations.* Don't like early starts? The last United Airlines flight from IAH to STL departs at 8:12PM UTC-6 and touches down at 10:20PM UTC-6.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in St. Louis?
Lambert-St. Louis Intl. Airport (STL) is the primary St. Louis hub for United Airlines flights from George Bush Intercontinental Airport (IAH).
Why fly with United Airlines from IAH to STL?
Travel from IAH to STL with United Airlines and you'll enjoy a range of perks including a rewarding loyalty program. When booking through Expedia as a United Mileage Plus and One Key™ member, you can also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
For the George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL) route, United Airlines typically uses Airbus A319 and Embraer 175 planes. Don't forget that last-minute changes can occur for operational purposes, meaning your flight could be on a different aircraft.
Can I change or cancel my United Airlines flight from George Bush Intercontinental Airport (IAH) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you can reschedule or cancel your flight, although there may be a charge if you made your booking over 24 hours ago. Want to keep your options open? Use our "No cancel fee" and "Changes included" filters to find flights that won't charge you extra if you need to adjust your plans. To make changes, head to "Trips," select your flight and click on "Manage Booking" for further information.

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