VA 570 then QF 431 at Sydney
Perth → Sydney → Melbourne
Timetable, Sydney time
06:10VA 570 from Perth at the gate
10:45QF 431 to Melbourne leaves the gate
4 h 35 apart on the timetable
Sydney’s board shows about 68% of departures at their timetable time, so delays of a few minutes don’t show here.
The last days
VA 570 and QF 431 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.