Flight Changi Airport departs from Singapore Changi Airport at 13:45 and arrives at Taipei Taoyuan International Airport at 18:35.
The flighttime is about 4h 50m. The distance travelled ("as the bird flies"): 2134 Km. So the average speed is roughly 442 Km.
The best day to arrive at Singapore is Sunday and it would be best to avoid Thursday, as prices are on average 178.47% higher than on Sunday. (Average prices, based on 1343810 datapoints.)
We have a lot more statistics for flights CI 754 and between Singapore and Taipei.
