Flight Changi Airport departs from Singapore Changi Airport at 00:30 and arrives at Tiruchirapalli International Airport at 02:25.
The flighttime is about 4h 25m. The distance travelled ("as the bird flies"): 2801 Km. So the average speed is roughly 634 Km.
There is an 2.5 hour time difference between Singapore and Tiruchirapalli