Flight Incheon International Airport departs from Seoul Incheon International Airport at 22:30 and arrives at Shanghai Pudong International Airport at 23:45.
The flighttime is about 2h 15m. The distance travelled ("as the bird flies"): 649 Km. So the average speed is roughly 288 Km.
There is an 1 hour time difference between Seoul and Shanghai
The best day to arrive at Seoul is Monday and it would be best to avoid Friday, as prices are on average 258.81% higher than on Monday. (Average prices, based on 3045550 datapoints.)
We have a lot more statistics for flights ZE 871 and between Seoul and Shanghai.