Flight Kansai International Airport departs from Osaka Kansai International Airport at 18:00 and arrives at Chengdu Chengdu Shuangliu International Airport at 22:05.
The flighttime is about 6h 05m. The distance travelled ("as the bird flies"): 3485 Km. So the average speed is roughly 573 Km.
There is an 2 hour time difference between Osaka and Chengdu