There is not going to be a direct flight from Vancouver to Cairns so flight time will heavily depend on stopovers. Any flight will be roughly 20 + hours.
Here is an example:
All Nippon Airways
Flight 1895
1:00 pm Depart from Vancouver, BC (YVR)
3:25 pm Arrives at Tokyo, (NRT)
10 hours 25 minutes - 4674 miles - Meal - Boeing 767-300/300ER (Jet)
4 hours 45 minutes layover in Tokyo
Qantas Airways
Flight 1688
10 pm Depart from Tokyo, (NRT)
4:50 am Arrives at Cairns, QL (CNS)
7 hours 40 minutes - 3638 miles - Refreshments - Boeing 767-300/300ER (Jet)
Qantas/QantasLink service takes 1hr 45min plus stopover time in Townsville as there is no direct flight. (Mackay > Townsville > Cairns)
Between 6 and 7 hours.
3 years on the wright brothers plane
The distance from Cairns, Australia to Hong Kong is 5534 kilometers. On average, a flight takes 7 hours, 20 minutes, not including layovers.
A typical flight between Australia and Hong Kong would have a flying time of about 7 hours, 14 minutes.
The flight distance from Brisbane, Australia to Hong Kong International Airport is about 4,310 miles.
From Perth to Hong Kong the flight distance is 3,727.
The flight should take you 9 hours.
3 and a half to four hours
A flight from Glasgow to Hong Kong would take about 12 hours.
The flight distance from Hamburg, Germany to Hong Kong is about 5,55o miles.
Los Angeles, California to Sydney, Australia
hong kong is not on fire
The flight distance from Hong Kong to Singapore is 1,596 miles / 2,569 km.
Hong Kong is in China,which is in Asia.