AC 3340 then UA 8153 at San Francisco
Portland (Oregon) → San Francisco → Washington
Timetable, San Francisco time
12:58AC 3340 from Portland (Oregon) at the gate
22:53UA 8153 to Washington leaves the gate
9 h 55 apart on the timetable
The last days
AC 3340 and UA 8153 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.