WN 2178 then UA 3923 at Phoenix
Burbank → Phoenix → Denver
Timetable, Phoenix time
17:45WN 2178 from Burbank at the gate
22:10UA 3923 to Denver leaves the gate
4 h 25 apart on the timetable
The last days
WN 2178 and UA 3923 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.