Question : What price range should you expect when booking from Porto (OPO) to Shenzhen (SZX)?
Answer : Ranging from $3,045 to $4,046, prices for OPO to SZX change less than most routes from Portugal. Prices tend to be lower the further out you book.
Question : How long do most people stay in Shenzhen?
Answer : Of course you're not most people, but if you were, you'd stay roughly 10 days.
Question : Is price more important than specific travel days for you?
Answer : The cheapest day to fly in March is Thursday. Flexibility is paramount when booking travel plans in order to keep travel costs down.