Flight Changi Airport departs from Singapore Changi Airport at 18:35 and arrives at Ahmedabad Sardar Vallabhbhai Patel International Airport at 21:35.
The flighttime is about 5h 30m. The distance travelled ("as the bird flies"): 3423 Km. So the average speed is roughly 622 Km.
There is an 2.5 hour time difference between Singapore and Ahmedabad