TP 4399 then CX 7858 at San Francisco
Boston → San Francisco → Seattle
Timetable, San Francisco time
00:25TP 4399 from Boston at the gate
08:33CX 7858 to Seattle leaves the gate
8 h 08 apart on the timetable
The last days
TP 4399 and CX 7858 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.