In general, when looking for the cheapest flight to Shenzhen, try to choose a flight departing in February for the best deal.
From most locations, booking your flights to Shenzhen around 48 days prior to your departure date finds the best deals.
On average, the cheapest flights to Shenzhen are found when departing on a Tuesday. Try to avoid departing on a Friday, as this is usually the most expensive day.
Generally, when visiting Shenzhen, afternoon flights represent the best value. midday flights are likely to have higher prices.