UA 480 then WN 3141 at Denver
Great Falls → Denver → Seattle
Timetable, Denver time
08:29UA 480 from Great Falls at the gate
20:55WN 3141 to Seattle leaves the gate
12 h 26 apart on the timetable
WN 3141 leaves 12 h 26 after UA 480 arrives on the timetable: more than half a day, so not a connection we count.