The best month to fly between Singapore and Hong Kong is May and the most expensive month to fly is August. (Average prices, based on 668 datapoints.)
The best day to arrive at Singapore is Wednesday and it would be best to avoid Friday, as prices are on average 41.75% higher than on Wednesday. (Average prices, based on 4194608 datapoints.)
The best time to fly is at around 8. (Average prices, based on 1472 datapoints.)