Maybe you're the type of traveler who likes planning every single detail of your trip. Or perhaps you prefer to jump in your rental car and take things as they come. Whatever your style, there are some facts about St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) that you can't leave home without.St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) is about 12 miles to the northwest from downtown St. Louis.