If you want a cheap flight from Cardiff to Osaka, you've got six airlines to choose from. You can use the search box to filter your preferences, but we've found that the cheapest day to fly is 15 / Dec / 2023.
You can use the filters on your search to see more flights and find cheaper rates – Osaka has more than one airport. So if you don't need to fly into Osaka Kansai International Airport, it's worth checking your other options. The 9659 km flight usually takes about 19 hrs 50 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.