Flight Shenzhen Bao'an International Airport departs from Shenzhen Shenzhen Bao'an International Airport at 07:15 and arrives at Tokyo Narita International Airport at 12:05.
The flighttime is about 3h 50m. The distance travelled ("as the bird flies"): 3069 Km. So the average speed is roughly 801 Km.
There is an 1 hour time difference between Shenzhen and Tokyo