QF 587 then QF 554 at Sydney
Gold Coast → Sydney → Brisbane
Timetable, Sydney time
15:40QF 587 from Gold Coast at the gate
19:50QF 554 to Brisbane leaves the gate
4 h 10 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 587 and QF 554 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.