- Hi! So if you're flying Southwest Airlines STL Terminal into St. Louis Lambert International Airport (STL), you'll be landing in Terminal 2, and you'll be using Concourse E with gates E4 to E24. The terminal is very accessible, and you find check-in and security quickly and easily, and then get boarded promptly. And the number of restaurants and stores does not keep you waiting for long. If you're coming from downtown St. Louis, the airport is about 14 miles away, so plan accordingly to avoid any last-minute rush. Arrive early, relax, and have a smooth journey with Southwest Airlines. Safe travels!