Please be aware that Seoul has multiple airports and that these results are for all airports serving the city.
The best month to fly between Seoul and Hong Kong is March and the most expensive month to fly is April. (Average prices, based on 495 datapoints.)
The best day to arrive at Seoul is Wednesday and it would be best to avoid Monday, as prices are on average 42.42% higher than on Wednesday. (Average prices, based on 509 datapoints.)
The cheapest airline flying from Seoul to Hong Kong is Hong Kong Express. They are 59% cheaper than Cathay Pacific. (Average prices, based on 508 datapoints.)
The best time to fly is at around 16. (Average prices, based on 854 datapoints.)