Kuala Lumpur International Airport (KLIA) is the main international airport serving Kuala Lumpur, the capital of Malaysia. It is located in the Sepang District of Selangor, approximately 45 kilometres (28 mi) south of downtown Kuala Lumpur and serves the city's greater conurbation.

Kuala Lumpur, officially the Federal Territory of Kuala Lumpur and colloquially referred to as KL, is a federal territory and the capital city of Malaysia. It is the largest city in the country, covering an area of 243 km2 (94 sq mi) with a census population of 2,163,000 as of 2022. Greater Kuala Lumpur, also known as the Klang Valley, is an urban agglomeration of 8.622 million people as of 2023. It is among the fastest growing metropolitan regions in Southeast Asia, both in population and economic development. Klang Valley is ASEAN's fifth largest economy after Singapore, Jakarta, Bangkok, and Manila.