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 December. (Average prices, based on 3425 datapoints.)
The best day to arrive at Seoul is Monday and it would be best to avoid Saturday, as prices are on average 7.22% higher than on Monday. (Average prices, based on 1611 datapoints.)
The cheapest airline flying to Seoul is Hong Kong Express. They are 42% cheaper than China Southern Airlines. (Average prices, based on 3563 datapoints.)
At Seoul the most flights depart around 08:00. (Hourly flights, based on 3777 datapoints.)
From Seoul it is on average the cheapest to fly to Shanghai and to Manila. (Average prices, based on 2622 datapoints.)
From Seoul most of the flights depart to Kuala Lumpur, second best connected from Seoul is Tokyo. (Daily flights, based on 154 datapoints.)