UA 337 then WN 8538 at Denver
Phoenix Sky Harbor → Denver → Des Moines
Timetable, Denver time
08:10UA 337 from Phoenix Sky Harbor at the gate
12:06WN 8538 to Des Moines leaves the gate
3 h 56 apart on the timetable
The last days
UA 337 and WN 8538 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.