I had a super smooth travel experience recently and just wanted to share a quick tip—if you're wondering what terminal is Southwest at STL? It's Terminal 2. Everything there was super clean and easy to navigate. The security lines moved quickly, and the Southwest staff was friendly. I got to my gate with plenty of time. If it’s your first time flying out of St. Louis, knowing the terminal ahead helps a ton.

For more info : https://www.terminalfind.com/southwest-airlines/southwest-airlines-stl-terminal-st-louis-lambert-international-airport/