Flight Changi Airport departs from Singapore Changi Airport at 18:55 and arrives at Kathmandu Tribhuvan International Airport at 21:45.
The flighttime is about 4h 50m. The distance travelled ("as the bird flies"): 2030 Km. So the average speed is roughly 420 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 263.93% higher than on Sunday. (Average prices, based on 46826 datapoints.)
We have a lot more statistics for flights SQ 442 and between Singapore and Kathmandu.