AA 3115 then UA 3913 at San Francisco
Chicago O'Hare → San Francisco → Washington
Timetable, San Francisco time
11:29AA 3115 from Chicago O'Hare at the gatealso QF 4922
16:00UA 3913 to Washington leaves the gate
4 h 31 apart on the timetable
The last days
AA 3115 and UA 3913 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.