The best month to fly between Hong Kong and Shanghai is September and the most expensive month to fly is July. (Average prices, based on 1569 datapoints.)
The best day to arrive at Hong Kong is Sunday and it would be best to avoid Saturday, as prices are on average 93.47% higher than on Sunday. (Average prices, based on 1452 datapoints.)
The cheapest airline flying from Hong Kong to Shanghai is Spring Airlines. They are 65% cheaper than Cathay Pacific. (Average prices, based on 1581 datapoints.)