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 Thursday and it would be best to avoid Saturday, as prices are on average 39.08% higher than on Thursday. (Average prices, based on 3164577 datapoints.)
We have a lot more statistics for flights BI 422 and between Singapore and Bandar Seri Begawan.