Chicago O'Hare International Airport (IATA: ORD, ICAO: KORD, FAA LID: ORD) is the primary international airport serving Chicago, Illinois, United States, located on the city's Northwest Side, approximately 17 miles (27 km) northwest of downtown. The airport is operated by the Chicago Department of Aviation and covers 7,627 acres (11.92 sq mi; 30.87 km2). It is the airport with the most runways in the world, with eight. Designed to be the successor to Chicago's Midway International Airport, itse...