AS 3121 then UA 2344 at Denver
San Diego → Denver → Austin
Timetable, Denver time
23:59AS 3121 from San Diego at the gate
07:55UA 2344 to Austin leaves the gate
7 h 56 apart on the timetable, overnight
The last days
AS 3121 and UA 2344 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.