Please be aware that Seoul has multiple airports and that these results are for all airports serving the city.
The best month to arrive at Seoul is November and the most expensive month to fly is August. (Average prices, based on 22047 datapoints.)
The best day to arrive at Seoul is Thursday and it would be best to avoid Saturday, as prices are on average 17.45% higher than on Thursday. (Average prices, based on 11697 datapoints.)
The cheapest airline flying to Seoul is Jeju Air. They are 74% cheaper than Korean Air. (Average prices, based on 22151 datapoints.)
At Seoul the most flights depart around 22:00. (Hourly flights, based on 23271 datapoints.)
From Seoul it is on average the cheapest to fly to Busan and to Manila. (Average prices, based on 2901 datapoints.)
From Seoul most of the flights depart to Kuala Lumpur, second best connected from Seoul is Tokyo. (Daily flights, based on 580 datapoints.)