Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 18:45 and arrives at Manila Ninoy Aquino International Airport at 23:15.
The flighttime is about 3h 30m. The distance travelled ("as the bird flies"): 2253 Km. So the average speed is roughly 644 Km.
There is an 1 hour time difference between Bangkok and Manila