UA 646 then K4 810 at O'Hare
Portland (Maine) → Chicago → Anchorage
Timetable, Chicago time
10:47UA 646 from Portland (Maine) at the gate
04:00K4 810 to Anchorage leaves the gate
17 h 13 apart on the timetable, overnight
K4 810 leaves 17 h 13 after UA 646 arrives on the timetable: more than half a day, so not a connection we count.