Update: I am seeing flights from YZ (Toronto), cheap as $410!
There’s a great deal running right now on Delta Airlines to Hong Kong from YEG or YUL airports for $390-$450 round trip all-in. Other Canadian locations might work. I can see as of 12:50am that there are several dates still available in May to end of year.
If you are not sure, just book now! Delta allows 24hr cancellation. Just make sure you book thru Delta’s website since I’m not positive if OTA’s same the same policies.