BR 646 then UA 2857 at O'Hare
Anchorage → Chicago → Denver
Timetable, Chicago time
17:10BR 646 from Anchorage at the gate
10:55UA 2857 to Denver leaves the gate
17 h 45 apart on the timetable, overnight
UA 2857 leaves 17 h 45 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.