Flight Changi Airport departs from Singapore Changi Airport at 14:45 and arrives at Manado Sam Ratulangi International Airport at 18:30.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 2328 Km. So the average speed is roughly 621 Km.
The best day to arrive at Singapore is Tuesday and it would be best to avoid Monday, as prices are on average 111.15% higher than on Tuesday. (Average prices, based on 127594 datapoints.)
We have a lot more statistics for flights TR 246 and between Singapore and Manado.