At what price range should I buy a Japanese flight ticket?

pu1. Except for Sapporo, 200,000 won is appropriate

2017-12-11

OK

pu2. It's usually 200,000 won, and if it's cheaper than that, it's cheaper

2017-12-11

OK

pu3. If it's Fukuoka, it's possible to get around 100,000 won

2017-12-11

OK