Flight Changi Airport departs from Singapore Changi Airport at 21:05 and arrives at Denpasar Bali Ngurah Rai International Airport at 23:45.
The flighttime is about 2h 40m. The distance travelled ("as the bird flies"): 1294 Km. So the average speed is roughly 485 Km.
The best day to arrive at Singapore is Sunday and it would be best to avoid Thursday, as prices are on average 86.25% higher than on Sunday. (Average prices, based on 20729266 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 201 datapoints.)
We have a lot more statistics for flights QZ 509 and between Singapore and Denpasar Bali.