As I was Playing with Alaska Mileage plan this evening. When I try to serach Singapore to Hong Kong, you can fly JAL with a stop in Tokyo NRT for just 25ks of Alaska Miles + $52 one way. Which is quite awesome, there is no a huge difference to compare this to Avianca Europe to US via Asia.
Works For Guangzhou Also!
Alaska Mileage Plan Singapore Crazy Routings
If you love to fly in comfort with less spends. This is a great chance, also that 25Ks of Alaska Miles can be earned by flying Many Asia gateways to Many Europe Gateways round trip in Business Class on Finnair