Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 11:30 and arrives at Paris Paris Charles de Gaulle Airport at 18:45.
The flighttime is about 12h 15m. The distance travelled ("as the bird flies"): 10699 Km. So the average speed is roughly 873 Km.
There is an 5 hour time difference between Bangkok and Paris