The best month to fly between Hong Kong and Seoul is July and the most expensive month to fly is January. (Average prices, based on 242 datapoints.)
The best day to arrive at Hong Kong is Thursday and it would be best to avoid Saturday, as prices are on average 63.82% higher than on Thursday. (Average prices, based on 285 datapoints.)
The cheapest airline flying from Hong Kong to Seoul is Hong Kong Express. They are 60% cheaper than Cathay Pacific. (Average prices, based on 251 datapoints.)