Flight Changi Airport departs from Singapore Changi Airport at 08:55 and arrives at Xiamen Gaoqi International Airport at 13:15.
The flighttime is about 4h 20m. The distance travelled ("as the bird flies"): 1797 Km. So the average speed is roughly 415 Km.
The best day to arrive at Singapore is Wednesday and it would be best to avoid Monday, as prices are on average 115.79% higher than on Wednesday. (Average prices, based on 127144 datapoints.)
We have a lot more statistics for flights MF 886 and between Singapore and Xiamen.