Flight Brunei International Airport departs from Bandar Seri Begawan Brunei International Airport at 02:05 and arrives at Seoul Incheon International Airport at 08:35.
The flighttime is about 5h 30m. The distance travelled ("as the bird flies"): 2207 Km. So the average speed is roughly 401 Km.
There is an 1 hour time difference between Bandar Seri Begawan and Seoul