Kuala Lumpur International Airport ( KLIA ) ( Malay : Lapangan Terbang Antarabangsa Kuala Lumpur ) ( IATA : KUL , ICAO : WMKK ) is Malaysia's main international airport and one of the major airports in Southeast Asia and worldwide. It is located in Sepang District of Selangor , approximately 45 kilometres (28 mi) south of Kuala Lumpur city centre and serves the Greater Klang Valley conurbation. KLIA is the largest and busiest airport in Malaysia. In 2018, it handled 59,988,409 passengers, 714,669 tonnes of cargo and 399,827 aircraft movements. It is the world's 23rd-busiest airport by total passenger traffic . The airport is operated by Malaysia Airports (MAHB) Sepang Sdn Bhd and is the major hub of Malaysia Airlines , MASkargo , AirAsia , AirAsia X , Malindo Air , flyGlobal , UPS Airlines and AsiaCargo Express .