Houston (IAH) to Saint Louis (STL) flights
One airline flies nonstop from Houston (IAH) to Saint Louis (STL): United Airlines. The two airports are 668 miles (1,075 km) apart. United Airlines is in Star Alliance. There are also 19 ways to fly it with one stop, through Dallas, Austin and Kansas City and more.
Airlines flying nonstop from IAH to STL
- United AirlinesStar Alliance · bookable with 13 programsWho books it
Book IAH to STL with points
Loyalty programs that can book at least one of the nonstop airlines, from the Award Booking Guide.
- Air Canada AeroplanBooks United Airlines
- Air New Zealand AirpointsBooks United Airlines
- ANA Mileage ClubBooks United Airlines
- Avianca LifeMilesBooks United Airlines
- Emirates SkywardsBooks United Airlines
- EVA Air Infinity MileageLandsBooks United Airlines
- JetBlue TrueBlueBooks United Airlines
- Lufthansa Miles & MoreBooks United Airlines
- Singapore Airlines KrisFlyerBooks United Airlines
- TAP Miles&GoBooks United Airlines
- Thai Royal Orchid PlusBooks United Airlines
- Turkish Airlines Miles&SmilesBooks United Airlines
- United MileagePlusBooks United Airlines
IAH to STL with one stop
19 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Dallas (DFW)American Airlines the whole way
- Via Austin (AUS)United Airlines, then Southwest Airlines
- Via Kansas City (MCI)United Airlines, then Southwest Airlines
- Via New Orleans (MSY)United Airlines, then Southwest Airlines
- Via Nashville (BNA)United Airlines, then Southwest Airlines
- Via San Antonio (SAT)United Airlines, then Southwest Airlines
- Via Pensacola (PNS)United Airlines, then Southwest Airlines
- Via Omaha (OMA)United Airlines, then Southwest Airlines
- Via Atlanta (ATL)Delta Air Lines and Frontier Airlines the whole way
- Via Chicago (ORD)American Airlines and United Airlines the whole way
- Via Panama City (ECP)United Airlines, then Southwest Airlines
- Via Milwaukee (MKE)United Airlines, then Southwest Airlines
- Via Columbus (CMH)United Airlines, then Southwest Airlines
- Via Minneapolis (MSP)Delta Air Lines the whole way
- Via Charlotte (CLT)American Airlines the whole way
IAH to STL: common questions
Which airlines fly nonstop from IAH to STL?
United Airlines (Star Alliance) flies nonstop from Houston (IAH) to Saint Louis (STL).
How far is Houston from Saint Louis by plane?
Houston (IAH) and Saint Louis (STL) are 668 miles (1,075 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
Which points programs can book IAH to STL award flights?
13 programs can book at least one of the nonstop airlines: Air Canada Aeroplan, Air New Zealand Airpoints, ANA Mileage Club, Avianca LifeMiles, Emirates Skywards, EVA Air Infinity MileageLands, JetBlue TrueBlue, Lufthansa Miles & More and 5 more. Which flights each can book depends on its partners, so check the airline before you transfer points.
How many miles does IAH to STL cost?
It depends on the program: each prices the route from its own chart or dynamically. The Award Flight Pricer compares 30+ programs for IAH to STL with taxes and fees.
Where can I connect between Houston and Saint Louis?
The most direct connections are through Dallas (DFW), Austin (AUS), Kansas City (MCI), New Orleans (MSY) and Nashville (BNA). On 6 of them the same airline flies both flights, for example American Airlines through Dallas.
More routes
Routes are scheduled nonstop flights. The route data is refreshed monthly; this list was last checked November 11, 2026. Seasonal routes and new launches can be missing or end early, so confirm with the airline before you book. Distances are great-circle, the shortest path between the two airports.