AS 3166 then AS 678 at Seattle
Portland (Oregon) → Seattle → Las Vegas
Timetable, Seattle time
13:19AS 3166 from Portland (Oregon) at the gate
17:59AS 678 to Las Vegas leaves the gate
4 h 40 apart on the timetable
Seattle’s board gives a departure time for only about 56% of its flights, so many days show no gate time.
The last days
AS 3166 and AS 678 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.