UA 2278 then AA 645 at O'Hare
San Francisco → Chicago → Raleigh-Durham
Timetable, Chicago time
05:04UA 2278 from San Francisco at the gate
11:31AA 645 to Raleigh-Durham leaves the gate
6 h 27 apart on the timetable
The last days
UA 2278 and AA 645 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.