K4 221 then UA 646 at O'Hare
Anchorage → Chicago → Denver
Timetable, Chicago time
13:41K4 221 from Anchorage at the gate
13:30UA 646 to Denver leaves the gate
23 h 49 apart on the timetable, overnight
UA 646 leaves 23 h 49 after K4 221 arrives on the timetable: more than half a day, so not a connection we count.