Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 12:35 and arrives at Phuket Phuket International Airport at 14:00.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 290 Km. So the average speed is roughly 205 Km.
The best day to arrive at Bangkok is Friday and it would be best to avoid Monday, as prices are on average 666.58% higher than on Friday. (Average prices, based on 21444053 datapoints.)
We have a lot more statistics for flights VN 3985 and between Bangkok and Phuket.