Yes, in 2026, the Changi Airport Skytrain is completely free to use. It connects Terminal 1, Terminal 2, and Terminal 3 in both the "Public" (landside) and "Transit" (airside) areas. The Skytrain is a driverless, automated people mover that runs approximately every 4 minutes and takes only about 2 to 4 minutes to travel between terminals. For passengers arriving at the airport via the MRT (subway), the station is located between T2 and T3, so you can simply walk into Terminal 3 or take the free Skytrain to T1 or T2. Note that the Skytrain operates between 05:00 and 02:30 daily; if you are transferring during the early morning "downtime" (02:30 to 05:00), the airport provides free shuttle buses instead. While the Skytrain does not serve Terminal 4 (which uses a separate free shuttle bus), it remains the most efficient and cost-free way to navigate the main terminal complex at Changi.