UA 5803 then BR 658 at O'Hare
Lexington → Chicago → Toronto Pearson
Timetable, Chicago time
14:41UA 5803 from Lexington at the gate
11:30BR 658 to Toronto Pearson leaves the gate
20 h 49 apart on the timetable, overnight
BR 658 leaves 20 h 49 after UA 5803 arrives on the timetable: more than half a day, so not a connection we count.