CV 12 then UA 646 at O'Hare
Anchorage → Chicago → Denver
Timetable, Chicago time
19:11CV 12 from Anchorage at the gate
13:30UA 646 to Denver leaves the gate
18 h 19 apart on the timetable, overnight
UA 646 leaves 18 h 19 after CV 12 arrives on the timetable: more than half a day, so not a connection we count.