UA 3682 then DL 2275 at Boston
Newark → Boston → Washington National
Timetable, Boston time
09:43UA 3682 from Newark at the gate
14:28DL 2275 to Washington National leaves the gate
4 h 45 apart on the timetable
The last days
UA 3682 and DL 2275 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.