UA 323 then WN 1749 at Denver
Philadelphia → Denver → Dallas
Timetable, Denver time
10:05UA 323 from Philadelphia at the gate
05:35WN 1749 to Dallas leaves the gate
19 h 30 apart on the timetable, overnight
WN 1749 leaves 19 h 30 after UA 323 arrives on the timetable: more than half a day, so not a connection we count.