Flight Taoyuan International Airport departs from Taipei Taoyuan International Airport at 07:20 and arrives at Phnom Penh Phnom Penh International Airport at 09:50.
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 Taipei and Phnom Penh