Flight Shenzhen Bao'an International Airport departs from Shenzhen Shenzhen Bao'an International Airport at 08:35 and arrives at Seoul Incheon International Airport at 13:40.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 1621 Km. So the average speed is roughly 397 Km.
There is an 1 hour time difference between Shenzhen and Seoul