The best month to fly between Hong Kong and Shanghai is May and the most expensive month to fly is January. (Average prices, based on 225 datapoints.)
The best day to arrive at Hong Kong is Friday and it would be best to avoid Saturday, as prices are on average 137.13% higher than on Friday. (Average prices, based on 253 datapoints.)
The cheapest airline flying from Hong Kong to Shanghai is Hong Kong Airlines. They are 57% cheaper than Cathay Pacific. (Average prices, based on 236 datapoints.)