Flight Shenzhen Bao'an International Airport departs from Shenzhen Shenzhen Bao'an International Airport at 11:05 and arrives at Seoul Incheon International Airport at 15:40.
The flighttime is about 3h 35m. The distance travelled ("as the bird flies"): 1621 Km. So the average speed is roughly 452 Km.
There is an 1 hour time difference between Shenzhen and Seoul