Flight King Fahd International Airport departs from Ad Dammam King Fahd International Airport at 04:15 and arrives at Dubai International Airport at 06:40.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 624 Km. So the average speed is roughly 440 Km.
There is an 1 hour time difference between Ad Dammam and Dubai