Xining Caojiapu International Airport (IATA: XNN, ICAO: ZLXN), is an airport serving Xining, the capital of Qinghai Province, China.

It is located in Huzhu County, Haidong, on the Tibetan Plateau about 30 kilometres (19 mi) east of downtown Xining.

Built on the orders of military governor Ma Bufang in 1931,[6] it saw limited use by commercial airlines in 1933.

A commercial route flew between Xining, Lanzhou, Baotou, and Beijing with fewer than 1,000 passengers per year.

Construction of Caojiapu airport was approved by the State Council on 17 May 1985 and started in 1989.