Singapore Changi Airport (IATA: SIN, ICAO: WSSS) is one of the world's busiest and most awarded airports, renowned for its exceptional passenger experience. Located in the eastern part of Singapore, it serves as a major international hub in Southeast Asia.Singapore Changi Airport (IATA: SIN, ICAO: WSSS) is one of the world's busiest and most awarded airports, renowned for its exceptional passenger experience. Located in the eastern part of Singapore, it serves as a major international hub in Southeast Asia.