DL 4237 then DL 1662 at Salt Lake City
St George → Salt Lake City → Las Vegas
Timetable, Salt Lake City time
10:11DL 4237 from St George at the gate
23:15DL 1662 to Las Vegas leaves the gate
13 h 04 apart on the timetable
DL 1662 leaves 13 h 04 after DL 4237 arrives on the timetable: more than half a day, so not a connection we count.