The best month to fly between Hong Kong and Singapore is February and the most expensive month to fly is July. (Average prices, based on 2565 datapoints.)
The best day to arrive at Hong Kong is Friday and it would be best to avoid Sunday, as prices are on average 67.2% higher than on Friday. (Average prices, based on 2072062 datapoints.)
The best time to fly is at around 0. (Average prices, based on 4540 datapoints.)