Please be aware that Shanghai has multiple airports and that these results are for all airports serving the city.
The best month to fly between Shanghai and Hong Kong is September and the most expensive month to fly is March. (Average prices, based on 203 datapoints.)
The best day to arrive at Shanghai is Friday and it would be best to avoid Wednesday, as prices are on average 23.73% higher than on Friday. (Average prices, based on 203 datapoints.)
The cheapest airline flying from Shanghai to Hong Kong is Hong Kong Airlines. They are 20% cheaper than Cathay Pacific. (Average prices, based on 217 datapoints.)