I suggest you go to Beijing, transfer to the last flight, buy 120 yuan at HNA, and then buy a ticket from 450 yuan, 570 yuan, in ELONG.COM. 330 yuan -900 yuan airport fee is more cost-effective.
Hainan airlines HU7506
Boeing 737-80007:25
09:20 Longjia Airport
capital airport
Hainan airlines HU7 1 1 1
Boeing 737-800 15:30
19:00 Capital Airport
Wujiaba airport