Please be aware that Seoul has multiple airports and that these results are only for Incheon International Airport.
The best month to arrive at Seoul is June and the most expensive month to fly is January. (Average prices, based on 217 datapoints.)
The best day to arrive at Seoul is Friday and it would be best to avoid Sunday, as prices are on average 13.62% higher than on Friday. (Average prices, based on 2564 datapoints.)
The cheapest airline flying to Seoul is Philippines AirAsia. They are 30% cheaper than Shandong Airlines. (Average prices, based on 485 datapoints.)
At Seoul the most flights depart around 23:00. (Hourly flights, based on 951 datapoints.)
From Seoul it is on average the cheapest to fly to Shanghai and to Manila. (Average prices, based on 1929 datapoints.)
From Seoul most of the flights depart to Tokyo, second best connected from Seoul is Jeju City. (Daily flights, based on 240 datapoints.)