Zuji is one of Hong Kong’s few online travel agencies that actually work well, it’s affiliated with US based Travelocity so you know it’s legitimate.
Prices for flights are hit and miss to me, sometimes they’re as cheap as other sites, sometimes they’re not. The best thing about Zuji is that they let you select specific legs, and show results for Asia based carriers. Many other online travel agencies primarily focus on European or American carriers. Also, on Zuji you can see a list of destinations and the latest fare sales, e.g. UA flight to SIN for $920+ taxes currently running until July 12.
If you don’t hold a Mastercard, click here: Non-Mastercard holders
You can get $150 HKD hotel voucher when booking a flight to Japan, Korea, or Singapore, or $100 HKD voucher for booking flights elsewhere.