If you want a cheap flight from Isle Of Man to Sapporo, you've got two airlines to choose from.
You can use the filters on your search to see more flights and find cheaper rates – Sapporo has more than one airport. So if you don't need to fly into New Sapporo International Airport, it's worth checking your other options. The 8786 km flight usually takes about 30 hrs.
There are about six flights to or via Sapporo every week, so you have plenty of options.
If you're planning on going to Sapporo during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.