UA 641 then UA 3428 at Dulles
Atlanta (ATL) → Washington → Buffalo
Timetable, Washington time
07:18UA 641 from Atlanta (ATL) at the gate
12:40UA 3428 to Buffalo leaves the gate
5 h 22 apart on the timetable
The last days
UA 641 and UA 3428 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.