DL 3744 then DL 2875 at Salt Lake City
Spokane → Salt Lake City → Las Vegas
Timetable, Salt Lake City time
12:47DL 3744 from Spokane at the gate
17:45DL 2875 to Las Vegas leaves the gate
4 h 58 apart on the timetable
The last days
DL 3744 and DL 2875 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.