Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 15:20 and arrives at Jeddah King Abdulaziz International Airport at 20:30.
The flighttime is about 9h 10m. The distance travelled ("as the bird flies"): 6839 Km. So the average speed is roughly 746 Km.
There is an 4 hour time difference between Bangkok and Jeddah