What to know
STL official airline directory lists Southwest at STL. Terminal operations can move during construction, irregular operations, or seasonal schedule changes.
Airport layout
St. Louis Lambert International Airport uses Terminal 1 as its primary passenger-processing area. Follow the concourse or gate shown on the day-of-travel boarding pass.
Getting to the gate
Choose the STL terminal shown by the operating airline, then confirm the check-in zone before curbside drop-off. Allow extra time when the gate is in a different concourse.
Connections
Connection paths at STL depend on the concourse pair and current security controls. Follow airport signs and ask the operating airline before leaving the secure area.