Please be aware that Osaka and Seoul has multiple airports and that these results are for all airports serving the city.
The best month to fly between Osaka and Seoul is July and the most expensive month to fly is February. (Average prices, based on 553 datapoints.)
The best day to arrive at Osaka is Tuesday and it would be best to avoid Monday, as prices are on average 237.27% higher than on Tuesday. (Average prices, based on 566 datapoints.)
The cheapest airline flying from Osaka to Seoul is Jin Air. They are 57% cheaper than Korean Air. (Average prices, based on 577 datapoints.)
The best time to fly is at around 12. (Average prices, based on 836 datapoints.)