UA 1234 then WN 581 at Denver
Spokane → Denver → Nashville
Timetable, Denver time
08:19UA 1234 from Spokane at the gate
07:55WN 581 to Nashville leaves the gate
23 h 36 apart on the timetable, overnight
WN 581 leaves 23 h 36 after UA 1234 arrives on the timetable: more than half a day, so not a connection we count.