Is it cheaper to buy air-ticket from Singapore than in Kunming?

Hi!
would like to know if it is cheaper to buy air-tickets [Kunming to Guangzhou] from Singapore than
in Kunming?
p.s. I am flying to Kunming from singapore and buying the air-ticket from s'pore.[Eastern Airlines]
IF IT IS CHEAPER TO BUY IN KUNMING,BUY FROM THE SHENZEN AIRLINES OFFICE IN KUNMING OR FROM ANY TRAVEL AGENT?
Thank you in advance and have a nice day!