At Shenzhen the most flights depart around 06:00. (Hourly flights, based on 358 datapoints.)
From Shenzhen it is on average the cheapest to fly to Hangzhou and to Kuala Lumpur. (Average prices, based on 84 datapoints.)
From Shenzhen most of the flights depart to Shanghai, second best connected from Shenzhen is Beijing. (Daily flights, based on 112 datapoints.)