K4 557 then UA 646 at O'Hare
Anchorage → Chicago → Denver
Timetable, Chicago time
14:14K4 557 from Anchorage at the gate
13:30UA 646 to Denver leaves the gate
23 h 16 apart on the timetable, overnight
UA 646 leaves 23 h 16 after K4 557 arrives on the timetable: more than half a day, so not a connection we count.