Route guide · 668 miles
Cheap Flights from St. Louis to Houston
STL → IAH · Nonstop 1h 51m · Live round-trip fares
Looking for cheap flights from St. Louis to Houston? You're in the right place. Airfare Deal tracks live fares on this 668-mile route around the clock. As a rule of thumb, booking 2–4 weeks ahead lands the best prices — and a free fare alert means you never have to keep refreshing the page.
Live fares for STL → IAH are updating. Use the search below for real-time prices.
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Updated daily
Flight time
1h 51m
Nonstop, typical
Distance
668 mi
STL → IAH
Book ahead
2–4 weeks
Best window, typically
Nonstop airlines
1
United Airlines
Nonstop flights from St. Louis to Houston
Want to skip the layover? Nonstops from St. Louis to Houston are flown by United Airlines, getting you there in about 1h 51m. For the lowest fares, book around 2–4 weeks before departure — last-minute nonstops on this route rarely come cheap.
Booking insights: St. Louis → Houston
- Distance: 668 miles · nonstop flight time: 1h 51m.
- Rule of thumb for this route: the sweet spot is usually 2–4 weeks before departure.
- If your dates flex by a day or two, shifting to a midweek departure is the easiest saving there is.
- Set a free Airfare Deal alert instead of checking daily — the best fares can sell out in hours.
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Flying from St. Louis to Houston: what you need to know
The flight
St. Louis to Houston covers 668 miles, and a nonstop gets it done in about 1h 51m. That's long enough to settle in with a coffee and a downloaded show, short enough that a connection rarely makes sense — a layover usually doubles your travel day to save very little.
Airlines on this route
United Airlines flies this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from St. Louis (STL)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our St. Louis airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Houston (IAH)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The Houston airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Houston to St. Louis fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 668 miles, booking 2–4 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
- Flexible dates? Search a few days either side — one day can change the fare a lot.
- Morning flights are delayed less often than evening ones — earlier departures have the best on-time record.
- Basic economy fares often exclude checked bags and seat selection. Price the whole trip, not the headline fare.
St. Louis to Houston flight FAQs
How long is the flight from STL to IAH?
A nonstop from STL to IAH clocks in at around 1h 51m for the 668-mile trip. If you're connecting, budget an extra 2–4 hours depending on where you stop.
Are there nonstop flights from St. Louis to Houston?
Yes — look for United Airlines on this route. Nonstop seats are usually priced best 2–4 weeks before departure.
What is the cheapest month to fly from St. Louis to Houston?
Fares from St. Louis to Houston tend to ease outside the peak summer and holiday rush — the late-summer and early-fall shoulder weeks are usually kinder on the wallet. Set a free Airfare Deal alert and we'll flag the dips for your dates.
How much are last minute flights from STL to IAH?
Walking up to this route at the last minute is the expensive way to do it — prices inside 7 days of departure climb fast. The 2–4 weeks booking window is where the value sits.
What is a good round-trip deal from St. Louis to Houston?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from St. Louis to Houston?
The main carriers on this route are United Airlines. Comparing all of them on the live search below usually surfaces the lowest fare for your dates.
How early should I get to St. Louis airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
More cheap flights from St. Louis
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