The cheapest airline flying to Hangzhou is Shanghai Airlines. They are 89% cheaper than All Nippon Airways. (Average prices, based on 201 datapoints.)
At Hangzhou the most flights depart around 21:00. (Hourly flights, based on 306 datapoints.)
From Hangzhou most of the flights depart to Beijing, second best connected from Hangzhou is Xiamen. (Daily flights, based on 54 datapoints.)