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 March and the most expensive month to fly is June. (Average prices, based on 437 datapoints.)
The best day to arrive at Shanghai is Monday and it would be best to avoid Saturday, as prices are on average 86.25% higher than on Monday. (Average prices, based on 456 datapoints.)
The best time to fly is at around 19. (Average prices, based on 588 datapoints.)