UA 352 then WN 988 at Denver
Montrose → Denver → Buffalo
Timetable, Denver time
14:50UA 352 from Montrose at the gate
11:50WN 988 to Buffalo leaves the gate
21 h apart on the timetable, overnight
WN 988 leaves 21 h after UA 352 arrives on the timetable: more than half a day, so not a connection we count.