QR 2143 then UA 751 at San Francisco
Santa Ana → San Francisco → Las Vegas
Timetable, San Francisco time
12:49QR 2143 from Santa Ana at the gatealso AS 2418, QR 3354, QR 8831, QR 8913, AA 9372
16:50UA 751 to Las Vegas leaves the gate
4 h 01 apart on the timetable
The last days
QR 2143 and UA 751 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.