Flight Bandaranaike International Airport departs from Colombo Bandaranaike International Airport at 15:40 and arrives at Muscat International Airport at 18:30.
The flighttime is about 4h 20m. The distance travelled ("as the bird flies"): 2466 Km. So the average speed is roughly 569 Km.
There is an 1.5 hour time difference between Colombo and Muscat