Flight Changi Airport departs from Singapore Changi Airport at 19:15 and arrives at Penang Penang International Airport at 20:45.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 423 Km. So the average speed is roughly 282 Km.
The best day to arrive at Singapore is Monday and it would be best to avoid Wednesday, as prices are on average 292.08% higher than on Monday. (Average prices, based on 2137954 datapoints.)
We have a lot more statistics for flights JQ 677 and between Singapore and Penang.