Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 11:25 and arrives at Vientiane Wattay International Airport at 12:40.
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 month to arrive at Bangkok is September and the most expensive month to fly is January. (Average prices, based on 246 datapoints.)
We have a lot more statistics for flights TG 570 and between Bangkok and Vientiane.