UA 540 then CV 251 at O'Hare
San Diego → Chicago → Dallas-Fort Worth
Timetable, Chicago time
04:34UA 540 from San Diego at the gate
22:10CV 251 to Dallas-Fort Worth leaves the gate
17 h 36 apart on the timetable
CV 251 leaves 17 h 36 after UA 540 arrives on the timetable: more than half a day, so not a connection we count.