DuPage Airport is a general aviation airport located 29 miles (47 km) west of downtown Chicago in West Chicago, DuPage County, Illinois, United States. It is owned and operated by the DuPage Airport Authority, which is an independent government body established by law by the state of Illinois. It also serves as a relief airport for O'Hare International Airport and Chicago Midway International Airport, both in nearby Chicago.

West Chicago is a city in DuPage County, Illinois, United States. The population was 25,614 at the 2020 census. It was formerly named Junction and later Turner, after its founder, John B. Turner, president of the Galena and Chicago Union Railroad (G&CU) in 1855. The city was initially established around the first junction of railroad lines in Illinois, and today is still served by the Union Pacific West Metra service via West Chicago station.