Terminal 4 is connected to these terminals by a regular complimentary shuttle bus service. It's generally recommended that a minimum sensible transit time at Changi airport is two hours.

Yes, 2 hours is generally enough for a transit at Singapore Changi Airport, which is widely considered the most efficient airport in the world. Changi advises a minimum of 1.5 to 2 hours for most international connections, but because the terminals are connected by the high-speed "Skytrain" and transit shuttle buses, you can often cross between gates in under 20 minutes. However, if your connection involves Terminal 4, which is separate from Terminals 1, 2, and 3, you should allow closer to 2.5 hours to account for the shuttle bus ride. In 2026, you should also remember that you must clear security at the gate for many flights, so don't spend too much time in the "Jewel" or the butterfly gardens. If your flights are on separate tickets, 2 hours is very risky as you would need to clear immigration, collect bags, and re-check in, which usually requires a 4-hour window at minimum.