DL 9963 then DL 2377 at Salt Lake City
Los Angeles → Salt Lake City → Chicago O'Hare
Timetable, Salt Lake City time
09:03DL 9963 from Los Angeles at the gate
13:55DL 2377 to Chicago O'Hare leaves the gate
4 h 52 apart on the timetable
The last days
DL 9963 and DL 2377 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.