UA 2148 then CA 3174 at O'Hare
Washington National → Chicago → Guangzhou
Timetable, Chicago time
19:30UA 2148 from Washington National at the gate
13:40CA 3174 to Guangzhou leaves the gate
18 h 10 apart on the timetable, overnight
CA 3174 leaves 18 h 10 after UA 2148 arrives on the timetable: more than half a day, so not a connection we count.