Singapore Changi Airport ( CHAHNG-ee; IATA: SIN, ICAO: WSSS) is the primary international airport that serves the country of Singapore, and is one of the largest transportation hubs in Asia. More than 100 airlines operate from the airport, with flights to destinations in Asia, Oceania, Africa, Europe, the Middle East, and North America.

The airport is located within its namesake, the district of Changi, at the eastern end of Singapore, approximately 24 kilometres (15 miles) east from Singapore's Downtown Core on a 25-square-kilometre (9.7 sq mi) site. It is the home base of BOC Aviation and Jetstar Asia, as well as the country's flag carrier of Singapore Airlines, its cargo division Singapore Airlines Cargo and its low-cost subsidiary Scoot. SATS is also headquartered at the airport.

With Singapore's strategic location being a favourable destination for high demand layovers, the airport also serves as a focus city for Qantas, as well as the flagship cargo hub for FedEx Express in Asia.

In 2024, Changi Airport served 67.7 million passengers, which was a 14.8 per cent increase from the 58.9 million passengers who passed through the airport in 2023.

Changi recorded about 366,000 aircraft movement in 2024, up from 328,000 in 2023. The airport handled 382,000 flights in 2019.

Changi was ranked the fourth busiest international airport in the world in 2024 by OAG. Skytrax ranked Changi Airport in fourth position in two categories; world's cleanest airport and the best airport staff.