UA 2138 then AC 740 at O'Hare
St Louis → Chicago → Toronto Pearson
Timetable, Chicago time
14:35UA 2138 from St Louis at the gate
19:35AC 740 to Toronto Pearson leaves the gate
5 h apart on the timetable
The last days
UA 2138 and AC 740 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.