DL 4237 then WN 2258 at Salt Lake City
St George → Salt Lake City → Las Vegas
Timetable, Salt Lake City time
08:35DL 4237 from St George at the gate
21:25WN 2258 to Las Vegas leaves the gate
12 h 50 apart on the timetable
WN 2258 leaves 12 h 50 after DL 4237 arrives on the timetable: more than half a day, so not a connection we count.