If you want a cheap flight from Dundee to Osaka, you've got one airlines to choose from.
Make sure you use the search options above to search for flights to other airports in Osaka, not just Osaka Kansai International Airport. The more options you look at, the better your chance of finding a cheap deal. Just so you know, the flight typically takes 25 hrs 15 mins.
If you're planning on going to Osaka during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.