Please be aware that Beijing has multiple airports and that these results are for all airports serving the city.
The best month to fly between Beijing and Guangzhou is August and the most expensive month to fly is March. (Average prices, based on 213 datapoints.)
The best day to arrive at Beijing is Monday and it would be best to avoid Friday, as prices are on average 92.23% higher than on Monday. (Average prices, based on 213 datapoints.)
The cheapest airline flying from Beijing to Guangzhou is Hainan Airlines. They are 44% cheaper than Shenzhen Airlines. (Average prices, based on 235 datapoints.)
The best time to fly is at around 20. (Average prices, based on 479 datapoints.)