✔ 最佳答案
If you want to buy discount ticket, please check the airline website (especially Cathay) around the Easter Holiday. When CX has promotional price, Qantas and Virgin will also have discounted price. Normally flying to Sydney on direct flight will be around 6000 including tax and charges.
For the cheapest air ticket, it should be Vietnam Airline. Usually they can do 3000 without tax, totally will be 5000 something but with a very bad connection time. You will have to wait at Vietnam airport for a long long time... Singapore Airline provides quick transfer in Singapore, but the ticket is not very cheap, around 3 - 500 less than direct flight...
So I would suggest you considering Qantas and Virgin, it's not very expensive, and no need to change flight... Cheapest doesn't mean the best
Things in Sydney is very expensive, especially when A$1.00 = HK$7.10 now... A small coffee can cost you HK$25.00... Considering entertainment , transports, and meals, you need at least A$100.00 a day.. So, bring A$10000 there... should be enough, if not, using credit card please...