San Francisco International Airport (IATA: SFO, ICAO: KSFO, FAA LID: SFO) is an international airport in an unincorporated area of San Mateo County, 13 miles (21 km) south of Downtown San Francisco. It has flights to points throughout North America and is a major gateway to Europe, the Middle East, Asia, and Oceania.SFO is the largest airport in the San Francisco Bay Area and the second-busiest in California, after Los Angeles International Airport (LAX). In 2017, it was the seventh-busiest airport in the United States and the 24th-busiest in the world by passenger count.