Please be aware that Shanghai has multiple airports and that these results are only for Hongqiao International airport.
The best day to arrive at Shanghai is Tuesday and it would be best to avoid Sunday, as prices are on average 145.28% higher than on Tuesday. (Average prices, based on 340 datapoints.)
At Shanghai the most flights depart around 21:00. (Hourly flights, based on 218 datapoints.)
From Shanghai it is on average the cheapest to fly to Xiamen and to Guangzhou. (Average prices, based on 233 datapoints.)
From Shanghai most of the flights depart to Guangzhou, second best connected from Shanghai is Singapore. (Daily flights, based on 66 datapoints.)