Flight Changi Airport departs from Singapore Changi Airport at 09:15 and arrives at Kathmandu Tribhuvan International Airport at 12:10.
The flighttime is about 4h 55m. The distance travelled ("as the bird flies"): 2030 Km. So the average speed is roughly 413 Km.
There is an 2 hour time difference between Singapore and Kathmandu
The best day to arrive at Singapore is Sunday and it would be best to avoid Monday, as prices are on average 75.08% higher than on Sunday. (Average prices, based on 46683 datapoints.)
We have a lot more statistics for flights MI 412 and between Singapore and Kathmandu.