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 237 datapoints.)
The best day to arrive at Shanghai is Thursday and it would be best to avoid Wednesday, as prices are on average 25.25% higher than on Thursday. (Average prices, based on 231 datapoints.)
The cheapest airline flying from Shanghai to Hong Kong is Spring Airlines. They are 32% cheaper than Cathay Pacific. (Average prices, based on 263 datapoints.)
The best time to fly is at around 21. (Average prices, based on 463 datapoints.)