Flight Changi Airport departs from Singapore Changi Airport at 07:55 and arrives at Makassar Sultan Hasanuddin International Airport at 11:00.
The flighttime is about 3h 05m. The distance travelled ("as the bird flies"): 1747 Km. So the average speed is roughly 567 Km.
The best month to arrive at Singapore is February and the most expensive month to fly is July. (Average prices, based on 331 datapoints.)
We have a lot more statistics for flights MI 142 and between Singapore and Makassar.