Flight Changi Airport departs from Singapore Changi Airport at 08:25 and arrives at Seoul Incheon International Airport at 15:40.
The flighttime is about 6h 15m. The distance travelled ("as the bird flies"): 2923 Km. So the average speed is roughly 468 Km.
There is an 1 hour time difference between Singapore and Seoul
The best day to arrive at Singapore is Sunday and it would be best to avoid Monday, as prices are on average 218.61% higher than on Sunday. (Average prices, based on 756672 datapoints.)
We have a lot more statistics for flights SQ 600 and between Singapore and Seoul.