Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 08:00 and arrives at Singapore Changi Airport at 11:45.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 1322 Km. So the average speed is roughly 353 Km.
The best day to arrive at Hong Kong is Wednesday and it would be best to avoid Saturday, as prices are on average 141.45% higher than on Wednesday. (Average prices, based on 2015053 datapoints.)
We have a lot more statistics for flights SQ 897 and between Hong Kong and Singapore.
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