UA 1889 then WN 1749 at Denver
Sacramento → Denver → Dallas
Timetable, Denver time
08:24UA 1889 from Sacramento at the gate
05:35WN 1749 to Dallas leaves the gate
21 h 11 apart on the timetable, overnight
WN 1749 leaves 21 h 11 after UA 1889 arrives on the timetable: more than half a day, so not a connection we count.