Flight Changi Airport departs from Singapore Changi Airport at 07:40 and arrives at Medan Kualanamu International Airport at 08:00.
The flighttime is about 1h 20m. The distance travelled ("as the bird flies"): 571 Km. So the average speed is roughly 428 Km.
There is an 1 hour time difference between Singapore and Medan
The best day to arrive at Singapore is Sunday and it would be best to avoid Thursday, as prices are on average 92.9% higher than on Sunday. (Average prices, based on 2532996 datapoints.)
We have a lot more statistics for flights SQ 990 and between Singapore and Medan.