UA 3874 then OS 46 at O'Hare
Chicago Rockford → Chicago → Vienna
Timetable, Chicago time
01:21UA 3874 from Chicago Rockford at the gate
16:20OS 46 to Vienna leaves the gate
14 h 59 apart on the timetable
OS 46 leaves 14 h 59 after UA 3874 arrives on the timetable: more than half a day, so not a connection we count.