TK 6019 then UA 2462 at Toronto Pearson
Chicago O'Hare → Toronto → San Francisco
Timetable, Toronto time
21:09TK 6019 from Chicago O'Hare at the gate
17:10UA 2462 to San Francisco leaves the gate
20 h 01 apart on the timetable, overnight
UA 2462 leaves 20 h 01 after TK 6019 arrives on the timetable: more than half a day, so not a connection we count.