Flight Changi Airport departs from Singapore Changi Airport at 16:50 and arrives at Clark Clark International Airport at 20:35.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 1921 Km. So the average speed is roughly 512 Km.
The best day to arrive at Singapore is Saturday and it would be best to avoid Wednesday, as prices are on average 107.78% higher than on Saturday. (Average prices, based on 296557 datapoints.)
We have a lot more statistics for flights 5J 538 and between Singapore and Clark.