UA 1591 then AS 630 at San Francisco
San Antonio → San Francisco → Seattle
Timetable, San Francisco time
11:02UA 1591 from San Antonio at the gate
15:08AS 630 to Seattle leaves the gatealso QR 2157, FJ 5822, AA 9399
4 h 06 apart on the timetable
The last days
UA 1591 and AS 630 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.