UA 3909 then OZ 6313 at San Francisco
Chicago O'Hare → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
22:20UA 3909 from Chicago O'Hare at the gate
16:45OZ 6313 to Dallas-Fort Worth leaves the gate
18 h 25 apart on the timetable, overnight
OZ 6313 leaves 18 h 25 after UA 3909 arrives on the timetable: more than half a day, so not a connection we count.