Flight Incheon International Airport departs from Seoul Incheon International Airport at 11:20 and arrives at Singapore Changi Airport at 16:50.
The flighttime is about 6h 30m. The distance travelled ("as the bird flies"): 2923 Km. So the average speed is roughly 450 Km.
There is an 1 hour time difference between Seoul and Singapore
The best day to arrive at Seoul is Wednesday and it would be best to avoid Sunday, as prices are on average 111.13% higher than on Wednesday. (Average prices, based on 903707 datapoints.)
We have a lot more statistics for flights SQ 611 and between Seoul and Singapore.
