UA 4516 then UA 3695 at Newark
Washington National → New York → Boston
Timetable, New York time
11:41UA 4516 from Washington National at the gate
17:29UA 3695 to Boston leaves the gate
5 h 48 apart on the timetable
The last days
UA 4516 and UA 3695 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.