Cha-ian Airport (Thai: สนามบินชะเอียน) is a Thai military airport operated by the Fourth Army, Royal Thai Army in the Pak Phun sub-district of Nakhon Si Thammarat Province, in southern Thailand. The Thai Airways Company formerly used Cha-ian Airport for passenger flights between Nakhon Si Thammarat-Surat Thani-Bangkok. Today, the airport is used by the military to transport the royal family.