Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 17:45 and arrives at Singapore Changi Airport at 21:00.
The flighttime is about 2h 15m. The distance travelled ("as the bird flies"): 462 Km. So the average speed is roughly 205 Km.
There is an 1 hour time difference between Bangkok and Singapore
The best day to arrive at Bangkok is Wednesday and it would be best to avoid Sunday, as prices are on average 106.5% higher than on Wednesday. (Average prices, based on 9266196 datapoints.)
We have a lot more statistics for flights TR 611 and between Bangkok and Singapore.