St. Louis Lambert International Airport (IATA: STL, ICAO: KSTL, FAA LID: STL) is the primary commercial airport serving metropolitan St. Louis, Missouri, United States. Commonly referred to as Lambert Field or simply Lambert, it is the largest and busiest airport in the state of Missouri. The airport covers 3,793 acres (1,535 ha) of land. STL is located 14 miles (23 km) northwest of downtown St. Louis in unincorporated St. Louis County between Berkeley and Bridgeton. The airport provides nonstop service to airports throughout the United States and to the Caribbean, Mexico, Canada, and Europe. In 2019, it served nearly 16 million passengers.