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. It is the largest air facility in the country, serving as a hub for all major Mongolian airlines, and is located in the Khöshig Valley of Sergelen, Töv Province, 52 km south of Ulaanbaatar and 20 km southwest of Zuunmod.