Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 20:50 and arrives at Vientiane Wattay International Airport at 21:50.
The flighttime is about 1h 00m. The distance travelled ("as the bird flies"): 223 Km. So the average speed is roughly 223 Km.
The best day to arrive at Bangkok is Tuesday and it would be best to avoid Sunday, as prices are on average 19.03% higher than on Tuesday. (Average prices, based on 260614 datapoints.)
We have a lot more statistics for flights GA 446 and between Bangkok and Vientiane.