UA 550 then WN 3141 at Denver
Calgary → Denver → Seattle
Timetable, Denver time
08:37UA 550 from Calgary at the gate
20:55WN 3141 to Seattle leaves the gate
12 h 18 apart on the timetable
WN 3141 leaves 12 h 18 after UA 550 arrives on the timetable: more than half a day, so not a connection we count.