Thorn Tree travel forum

1

it depends but I would think on that particular route China Southern probably has competitive prices. different airlines give different discounts at various times, its not like one airline always has the cheapest fares at any given time. you need to ask an agent or check elong.net

and if you can, choose Air China or Hainan Airlines rather than China Southern if you can.

2

Flying Shenzhen -- Beijing would be cheaper than Macau -- Beijing as the former is domestic (cheaper) and the latter international (more expensive).
For Shenzhen -- Beijing, there's 1 flight daily by Hainan Airlines. This would be my top pick if at all possible. There're also numerous flights daily by Air China and China Southern as well as Shenzhen Airlines. Stay well away from Shenzhen Airlines please.
Cheers!