St. Louis Lambert International Airport (STL) – Live TSA Wait Times & Traveler Updates

St. Louis Lambert International Airport (STL) serves as the main airport for St. Louis, Missouri and the surrounding metro area, offering convenient access to destinations across the United States. Located northwest of downtown St. Louis, the airport is widely known for its easy navigation, shorter walking distances, and less congestion compared to many major hubs.

STL operates as a key base for airlines such as Southwest, American, Delta, United, and Frontier, giving travelers plenty of nonstop and connecting options. The airport features two terminals — Terminal 1 and Terminal 2 — connected by a free shuttle service, making transfers straightforward. Recent upgrades have improved dining, security flow, and passenger amenities, while the airport’s distinctive architecture and history continue to make it a recognizable part of the region.

For many travelers, Lambert Airport offers a practical balance of efficiency, accessibility, and comfort.

Security screening at St. Louis Lambert International Airport is divided between the two terminals.

• Terminal 1 serves most airlines including American, Delta, United, and Frontier, and typically handles the bulk of passenger traffic.
• Terminal 2 is primarily used by Southwest Airlines and features its own dedicated TSA checkpoint.

Both terminals provide access to TSA PreCheck lanes, allowing eligible passengers to move through security more quickly. TSA checkpoints generally open around 4:00 a.m. and remain operational until the final departures of the evening.

Peak wait times at STL usually occur between 5:30–8:30 a.m. and 3:30–6:30 p.m., especially on Mondays, Fridays, and Sundays. While lines are often manageable, arriving at least two hours before your flight is still recommended during busy travel windows or holiday periods.