There's promotion for double Asiamiles to Helsinki on Finair from HK in all classes till Nov 30th
https://www.asiamiles.com/am/en/earn...0007d21c39RCRD
HKG-HEL return in Y is 9700miles or so, which mean u get about 19k Asiamiles plus 9.7k club miles.
Fares heavily dependent on dates and sales, cheapest I priced up at about 7k HKD inclusive of tax when they had their sales but when i just checked, it was about 9k minimum.
but you get a nice Aurora-trip if you are lucky.