Singapore Changi Airport (IPA: /ˈtʃɑːŋi/ CHAHNG-ee; IATA: SIN, ICAO: WSSS) is the principal international airport serving the Republic of Singapore, and functions as one of the most significant aviation gateways in the Asia-Pacific region. Situated within the Changi planning area in the eastern part of the country, the airport is approximately 24 kilometres (15 miles) from the Downtown Core and occupies a site spanning about 25-square-kilometre (9.7 sq mi). The airport is a base for more than 100 international carriers with scheduled services linking Singapore to destinations across Asia, Oceania, Africa, Europe, the Middle East and North America. As of 2024, Changi Airport handled 67.7 million passengers, ranking it as the 15th busiest globally.
Changi Airport serves as the headquarters for several aviation and ground handling entities. It is the home base of Singapore Airlines, the nation's flag carrier, along with its associated subsidiaries Singapore Airlines Cargo and Scoot, a regional low-cost carrier. The airport also hosts the operations of BOC Aviation, a major aircraft leasing firm. Ground and catering services are provided by SATS, whose facilities are located within the airport precincts. Owing to Singapore's central geographical location and high volume of international transit traffic, the airport has also been designated a principal cargo hub by FedEx Express, reinforcing its logistical and commercial importance within global air transport networks. The airport is managed by the Changi Airport Group, a corporate entity wholly owned by the Ministry of Finance of the Government of Singapore.