UA 587 then K4 591 at O'Hare
Santa Ana → Chicago → Anchorage
Timetable, Chicago time
13:09UA 587 from Santa Ana at the gate
17:00K4 591 to Anchorage leaves the gate
3 h 51 apart on the timetable
The last days
UA 587 and K4 591 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.