At St. Louis Lambert International Airport (STL), United Airlines operates out of Terminal 1. This airport is equipped with a variety of amenities, United Airlines At STL Terminal including restaurants, shops, and lounges, to enhance the traveler experience. For both domestic and international flights offered by United Airlines out of St. Louis, travelers can check in at the airline's ticket counters or self-service kiosks. United provides its premium visitors with access to the United Club lounge. Accessing the gates and other facilities is easy because the terminal is well-marked with signage. Make sure you arrive early to allow for security checks and check-in.