Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 09:55 and arrives at Vientiane Wattay International Airport at 11:10.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 223 Km. So the average speed is roughly 178 Km.
The best day to arrive at Bangkok is Monday and it would be best to avoid Tuesday, as prices are on average 161% higher than on Monday. (Average prices, based on 361566 datapoints.)
We have a lot more statistics for flights QV 442 and between Bangkok and Vientiane.
