UA 308 then CA 3174 at O'Hare
Philadelphia → Chicago → Guangzhou
Timetable, Chicago time
18:34UA 308 from Philadelphia at the gate
13:40CA 3174 to Guangzhou leaves the gate
19 h 06 apart on the timetable, overnight
CA 3174 leaves 19 h 06 after UA 308 arrives on the timetable: more than half a day, so not a connection we count.