邊間航空公司去ｌｏｎｄｏｎ比較便宜ｇａ？

Really hard to say... fuel surcharges increase from time to time...
Well, try non-stop flight(or more direct) out from Hong Kong in order to save the extra fuel surcharges. Did try to save money on Hong Kong to Canada for stopover flights. However, the difference could be HKD 3000 to 4000 more than one stopover flight...
To: London non-stop:
Cathay Paciifc, British Airways, Virgin Atlantic, Air New Zealand, Qantas Airways

2008-08-20 01:58:28 補充：
If you go to London, Ontario. Well, Air Canada or Cathay Pacific connect with local budget carriers

http://www.hongkongairport.com/chi/flight/airline-information/enquiry.html
http://www.mangocity.com.hk/include/images/top_left.jpg
http://www.package.hk/package.php?id=8227&page=1