Flight Phnom Penh International Airport departs from Phnom Penh Phnom Penh International Airport at 14:55 and arrives at Taipei Taoyuan International Airport at 19:25.
The flighttime is about 3h 30m. The distance travelled ("as the bird flies"): 1904 Km. So the average speed is roughly 544 Km.
There is an 1 hour time difference between Phnom Penh and Taipei