Some flat-Earthers claim there is no non-stop long-haul flights between two locations in the southern hemisphere. Flights need to make a stop in a location in the northern hemisphere because the distance will be too far and such flight will traverse the northern hemisphere, or more accurately, the center of the Earth according to their model.
It is easy to prove their assumption is wrong. We can find the following flights between two locations in the southern hemisphere. All of them are long-haul (between different continents) and non-stop flights.
- Sydney, Australia – Johannesburg, South Africa
- Sydney, Australia – Santiago, Chile
- Perth, Australia – Johannesburg, South Africa
- Auckland, New Zealand – Santiago, Chile
- Auckland, New Zealand – Buenos Aires, Argentina
- Melbourne, Australia – Santiago, Chile
- Sydney, Australia – Buenos Aires, Argentina (route no longer operational)
- Johannesburg, South Africa – São Paulo, Brazil
You can easily verify this fact using any travel booking websites. Or you can search Google using a search keyword like “flight from Sydney to Santiago”.