Flight Changi Airport departs from Singapore Changi Airport at 12:10 and arrives at Bandar Seri Begawan Brunei International Airport at 14:20.
The flighttime is about 2h 10m. The distance travelled ("as the bird flies"): 1223 Km. So the average speed is roughly 564 Km.
The best day to arrive at Singapore is Tuesday and it would be best to avoid Thursday, as prices are on average 109.84% higher than on Tuesday. (Average prices, based on 2992457 datapoints.)
We have a lot more statistics for flights BI 422 and between Singapore and Bandar Seri Begawan.