上機前，應預多少時間到機場做Check-in?

For all long-haul flights, check-in desk will open 3hours before the schedule departure of flight... For short-haul flights, check-in will begin 2hours before departure... (except Cathay Pacific/China Airlines/Singapore Airlines etc will have check-in open all day long...)
So for Qantas, their check-in will open 3hours before departure of the flight... And airlines gate will close approximately 45minutes before departure of flight... But I would suggest you to leave plently of time for check-in so please arrive at the airport around 1hours 30minutes before departure...
Of course, arriving early at when the check-in start means that you will get a better choice of seats and usually a shorter queue as well... But of course, you can also call the airlines local office for reserving a seat of your choice... But as many people would not arrive until last minute, there would usually be loads of people queuing for check-in as it gets towards 1hours 30minutes before the flight depart...

最好在起飛前兩小時到達check in
因要寄放行李須要時間的
如不是已畫好機位的話
早d到..坐的位置會好一點(如窗口位)
過完HK關後要行去搭 無人駕駛的列車去登機閘口
有很多閘口&會在不同層數
所以要睇清楚

因此預早2個鐘頭到達Counter Check In係最理想

最好係起飛前2小時到機場, 時間鬆動d, 唔駛急, 又可週圍行下, 食下野咁.

如果你好趕, 都起碼要45分鐘.
因為check-in可能排長龍, 你唔知.
可能登機閘口比較遠, 又要再搭車, 攪到你趕頭趕命.

最好係30-45分鐘之前到機場