Flight Changi Airport departs from Singapore Changi Airport at 13:25 and arrives at Bangkok Suvarnabhumi Airport at 15:15.
The flighttime is about 2h 50m. The distance travelled ("as the bird flies"): 462 Km. So the average speed is roughly 163 Km.
There is an 1 hour time difference between Singapore and Bangkok
The best day to arrive at Singapore is Monday and it would be best to avoid Thursday, as prices are on average 50.45% higher than on Monday. (Average prices, based on 10270499 datapoints.)
We have a lot more statistics for flights JL 712 and between Singapore and Bangkok.