QF 658 then QF 735 at Sydney
Perth → Sydney → Adelaide
Timetable, Sydney time
06:55QF 658 from Perth at the gate
10:15QF 735 to Adelaide leaves the gate
3 h 20 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
QF 658 and QF 735 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.