Luang Prabang International Airport, is one of the few international airports in Laos. The airport is located about 4 kilometres (2.5 mi) from the centre of Luang Prabang. The second busiest airport in the country, it is a regional hub for international flights to Bangkok, Chiang Mai and Siem Reap and other cities such as Vientiane and Phongsali. The airport underwent significant expansion work in 2012–13, when it was upgraded and expanded, and the runway enlarged.