Flight Changi Airport departs from Singapore Changi Airport at 00:10 and arrives at Seoul Gimpo International Airport at 07:45.
The flighttime is about 6h 35m. The distance travelled ("as the bird flies"): 2961 Km. So the average speed is roughly 450 Km.
There is an 1 hour time difference between Singapore and Seoul
The best day to arrive at Singapore is Tuesday and it would be best to avoid Sunday, as prices are on average 152.04% higher than on Tuesday. (Average prices, based on 400122 datapoints.)
We have a lot more statistics for flights SQ 608 and between Singapore and Seoul.