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 November and the most expensive month to fly is April. (Average prices, based on 2546 datapoints.)
The best day to arrive at Seoul is Wednesday and it would be best to avoid Sunday, as prices are on average 36.11% higher than on Wednesday. (Average prices, based on 543 datapoints.)
The cheapest airline flying to Seoul is Jin Air. They are 38% cheaper than Shandong Airlines. (Average prices, based on 2713 datapoints.)
At Seoul the most flights depart around 23:00. (Hourly flights, based on 3046 datapoints.)
From Seoul it is on average the cheapest to fly to Shanghai and to Osaka. (Average prices, based on 1281 datapoints.)
From Seoul most of the flights depart to Kuala Lumpur, second best connected from Seoul is Tokyo. (Daily flights, based on 185 datapoints.)