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 Guangzhou is June and the most expensive month to fly is August. (Average prices, based on 1528 datapoints.)
The best day to arrive at Shanghai is Monday and it would be best to avoid Sunday, as prices are on average 53.06% higher than on Monday. (Average prices, based on 1585 datapoints.)
The cheapest airline flying from Shanghai to Guangzhou is Spring Airlines. They are 36% cheaper than Hainan Airlines. (Average prices, based on 1560 datapoints.)