Buyant-Ukhaa International Airport, formerly called Chinggis Khaan International Airport from 2005 to 2020, is a semi-operational international airport serving Ulaanbaatar, Mongolia, situated 18 km (11 mi) southwest of the capital. Largely replaced by a new airport, it currently functions as a backup airport for the former, with a view to be used for flight training as well as for special, charter, and government flights.

Chinggis Khaan International Airport, also referred to as New Ulaanbaatar International Airport, is the primary airport serving Ulaanbaatar, and is Mongolia's only international airport. It opened on 4 July 2021, replacing Buyant-Ukhaa International Airport.