Flight Kansai International Airport departs from Osaka Kansai International Airport at 15:05 and arrives at Shenzhen Shenzhen Bao'an International Airport at 18:25.
The flighttime is about 4h 20m. The distance travelled ("as the bird flies"): 2487 Km. So the average speed is roughly 574 Km.
There is an 1 hour time difference between Osaka and Shenzhen