Wouldn't we need flights connecting each adjacent pair of the three southern hemispherical continents to cite flight times as proof of RE? All that has been proven is the the distance between Australia and Chile is consistent with the RE model. Has anyone adequately debunked flight time discrepancies between South Africa and Australia, or South Africa and South America?
Welcome to the Flat Earth Society forums, Terra!
You can use a flight finder like
travelocity or any of many others to find
nonstop flights (
not direct flights) between large cities. That will show what's available and give a nominal flight time. Plug the airline and flight number into a site like
flightaware, and it will give the planned distance for the flight. Note that the planned distance probably will not be exactly the same as great-circle distance, but is usually pretty close on long flights unless there is a reason to avoid a large region or take a longer route to catch more favorable winds aloft; it should never be shorter. The planned distances may change somewhat from day to day due to changing conditions. An alternative may be to find the flight on the airline's timetable and look for the distance they provide; that may be the actual great-circle distance from origin to destination.
Qantas Airlines, Sydney, Australia (SYD)/Johannesburg, South Africa (JNB)
QF63 SYD - JNB 14h 20m - Distance Planned:10,735 km
QF64 JNB - SYD 11h 50m - Distance Planned:11,033 km
South African Airways, Johannesburg, South Africa (JNB)/Sao Paulo, Brazil (GRU)
SA222 - JNB - GRU - 10h 20m - Distance Planned: 7,445 km
SA223 - GRU - JNB - 08h 25m - Distance Planned: 7,445 km
It looks like the eastbound flights are significantly faster than the westbound flights. This is probably due to strong westerly winds at the altitudes flown in those latitudes.
I couldn't find a nonstop between Africa and Santiago, Chile (SCL), which is an endpoint for most of the Australia to South America nonstops. Sao Paulo (GRU) was the best I could do in a quick search. Perhaps you can do better.