Through November 30, 2012 you can book tickets on Cathay Pacific for flights to Singapore for $1,100 HKD before taxes / fees.
This is a great fare for Cathay Pacific and I recently flew them from SIN to HKG, no complaints, plenty of empty seats, good food and service. You can definitely get to Singapore cheaper by flying the discount airlines such as Tiger Airways or Jetstar, but checked bags will cost you money, seating will be tight, flight will probably be full, no entertainment, and no food. Not to mention CX is usually on-time more often than the LCCs.
Here’s a link to the promotion. Total comes to about $1,972 after all fees / fuel surcharges, etc.
On the plus side, you can cancel these tickets for 600 HKD before departure.