WS 6161 then UA 1079 at San Francisco
Mexico City → San Francisco → Seattle
Timetable, San Francisco time
12:38WS 6161 from Mexico City at the gate
21:05UA 1079 to Seattle leaves the gate
8 h 27 apart on the timetable
The last days
WS 6161 and UA 1079 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.