3U 8205 then 3U 1077 at Guangzhou
Kunming → Guangzhou → Xi'an
Timetable, Guangzhou time
19:503U 8205 from Kunming at the gate
19:153U 1077 to Xi'an leaves the gatealso CZ 3231
23 h 25 apart on the timetable, overnight
3U 1077 leaves 23 h 25 after 3U 8205 arrives on the timetable: more than half a day, so not a connection we count.