Alight at Changi Airport Station.
Go to T2 Arrival Hall door 1, board the free 24-hour shuttle bus to T4.
Pick up at T2 Arrival Hall door 1. Drop off at T4 Departure between doors 3 and 4.
Journey takes about 10 minutes.
Shuttle bus leaves every 10 minutes from 5.30am to 12.00am, and every 20 minutes from 2am to 5am.