For a revenue ticket you should be charged about 3500 yen in economy and 4500 in business class for a one way ticket from Hong Kong to Tokyo. So slightly less or slightly more than 300 NOK. But there are differences between revenue and award tickets.
On my last redemption on NH I paid DKK 3416 in cash for a TPAC return ticket. Though that was in late 2015 so tricky compare.
Last edited by CPH-Flyer; Sep 13, 2017 at 4:34 pm