K4 579 then UA 2857 at O'Hare
Fairbanks → Chicago → Denver
Timetable, Chicago time
16:23K4 579 from Fairbanks at the gate
10:55UA 2857 to Denver leaves the gate
18 h 32 apart on the timetable, overnight
UA 2857 leaves 18 h 32 after K4 579 arrives on the timetable: more than half a day, so not a connection we count.