what is the cheapest airlines to fly from guangzhou to beijing, and how much the train cost

Hi, since the airfare changes often at different periods, it is hard to tell you which is the cheapest airlines. You need to pay attention to the airfare in real time. You can check the China Flight Schedule on this website to check it. You can also take high-speed train between them. It takes about 8-10 hours and the fare is CNY1380 for first class seat and CNY862 for second class seat. Guangzhou is a good option for you to buy those items.