Flight Incheon International Airport departs from Seoul Incheon International Airport at 09:00 and arrives at Singapore Changi Airport at 14:20.
The flighttime is about 6h 20m. The distance travelled ("as the bird flies"): 2923 Km. So the average speed is roughly 462 Km.
There is an 1 hour time difference between Seoul and Singapore
The best day to arrive at Seoul is Friday and it would be best to avoid Tuesday, as prices are on average 112.78% higher than on Friday. (Average prices, based on 272947 datapoints.)
We have a lot more statistics for flights OZ 6781 and between Seoul and Singapore.