UA 4604 then AC 7028 at Newark
Richmond → New York → Washington
Timetable, New York time
08:40UA 4604 from Richmond at the gate
13:49AC 7028 to Washington leaves the gate
5 h 09 apart on the timetable
The last days
UA 4604 and AC 7028 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.