Flight Changi Airport departs from Singapore Changi Airport at 15:50 and arrives at Dhaka Shahjalal International Airport at 18:00.
The flighttime is about 4h 10m. The distance travelled ("as the bird flies"): 1514 Km. So the average speed is roughly 363 Km.
There is an 2 hour time difference between Singapore and Dhaka
The best day to arrive at Singapore is Wednesday and it would be best to avoid Friday, as prices are on average 74.1% higher than on Wednesday. (Average prices, based on 624631 datapoints.)
We have a lot more statistics for flights BG 585 and between Singapore and Dhaka.