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 Singapore is May and the most expensive month to fly is February. (Average prices, based on 329 datapoints.)
The best day to arrive at Shanghai is Monday and it would be best to avoid Thursday, as prices are on average 283.8% higher than on Monday. (Average prices, based on 324 datapoints.)
The best time to fly is at around 9. (Average prices, based on 386 datapoints.)