DL 8939 then UA 8202 at San Francisco
Phoenix → San Francisco → Houston
Timetable, San Francisco time
14:57DL 8939 from Phoenix at the gate
18:42UA 8202 to Houston leaves the gate
3 h 45 apart on the timetable
The last days
DL 8939 and UA 8202 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.