Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Edmonton to Guangzhou as you normally would.
Most people fly into Guangzhou Baiyun (CAN) if they book a flight to Guangzhou from Edmonton. On average, Baiyun has 0 inbound flights from Edmonton per day from 2 airlines. Guangzhou Baiyun is conveniently located just 29.8 km from Guangzhou’s city centre.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Edmonton Airport to Guangzhou Baiyun Airport flight would often be abbreviated as a YEG to CAN flight.