Flight Narita International Airport departs from Tokyo Narita International Airport at 08:50 and arrives at Chengdu Chengdu Shuangliu International Airport at 13:20.
The flighttime is about 6h 30m. The distance travelled ("as the bird flies"): 4060 Km. So the average speed is roughly 625 Km.
There is an 2 hour time difference between Tokyo and Chengdu