AA 434 then UA 571 at O'Hare
San Francisco → Chicago → Las Vegas
Timetable, Chicago time
06:59AA 434 from San Francisco at the gate
10:30UA 571 to Las Vegas leaves the gate
3 h 31 apart on the timetable
The last days
AA 434 and UA 571 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.