G7 3375 then UA 662 at O'Hare
St Louis → Chicago → Toronto Pearson
Timetable, Chicago time
08:23G7 3375 from St Louis at the gate
21:21UA 662 to Toronto Pearson leaves the gate
12 h 58 apart on the timetable
UA 662 leaves 12 h 58 after G7 3375 arrives on the timetable: more than half a day, so not a connection we count.