A one-hour transit at Singapore Changi Airport (SIN) is extremely tight and generally only recommended if booked on a single ticket (PNR) with the same airline. Changi is world-renowned for its efficiency, and if your flight arrives on time, 60 minutes is physically possible because security screening is often performed at the individual gates rather than at a central checkpoint. However, if your first flight is delayed by even 15 minutes, you risk missing your connection. In 2026, Changi’s transit guide recommends 1.5 to 2 hours for a stress-free transfer, especially if you need to switch between terminals (like T1 to T4, which requires a shuttle bus). If you have booked two separate tickets (a "self-connection"), a one-hour window is almost impossible as you would need to clear immigration, collect bags, and re-check in. On a single ticket, the airline is responsible for rebooking you if you miss the flight, but you will likely be rushing through the terminal.