K4 579 then UA 1803 at O'Hare
Fairbanks → Chicago → Las Vegas
Timetable, Chicago time
16:23K4 579 from Fairbanks at the gate
10:30UA 1803 to Las Vegas leaves the gate
18 h 07 apart on the timetable, overnight
UA 1803 leaves 18 h 07 after K4 579 arrives on the timetable: more than half a day, so not a connection we count.