In case you're passing through St. with the Southwest Airlines STL Terminal. Terminal 2, the terminal you will use at Louis Lambert International Airport (STL), is where Concourse E is situated. Simple check-in counters, short security lines, and plenty of seating while you wait for your flight all help to make traveling smooth and hassle-free. Terminal 2 has a wide variety of places to eat and shop, whether you're searching for a quick snack, a last-minute souvenir, or simply a place to relax. It is about 14 miles from St. Louis, it's simple to get to the airport, so plan ahead.