Chicago O'Hare International Airport, also known as O'Hare Airport, Chicago International Airport, Chicago O'Hare or simply O'Hare, is an international airport on the Far Northwest Side of Chicago, Illinois, 17 miles northwest of the Loop. It is the primary airport serving the Chicago metropolitan area, with Midway International Airport, about 10 miles closer to the Loop, serving as a secondary airport. It is operated by the City of Chicago Department of Aviation.