Flight Kansai International Airport departs from Osaka Kansai International Airport at 14:00 and arrives at Shenzhen Shenzhen Bao'an International Airport at 18:05.
The flighttime is about 5h 05m. The distance travelled ("as the bird flies"): 2487 Km. So the average speed is roughly 489 Km.
There is an 1 hour time difference between Osaka and Shenzhen