A flight from London to Sydney indeed does have to stop "en route". It is necessary for the plane to make sure it has enough fuel to complete the full flight.
By 1968 Qantas was flying B707 on this route, flight number qf2 or some such Qf 736 is the flight Adelaide to Sydney
It's not a route, you can only get a connecting flight through Sydney or Melbourne
The flight path From Sydney to Johannesburg is over the the edges of the South Pole. The flight path depends on winds (and weather). It never goes as far as the South Pole, but the flight route from Sydney to Johannesburg often does go almost to the edge of Antarctica where the jet stream is not quite as strong. The sea ice around the edge of Antarctica can occasionally be visible from the plane (especially in July in August when it is thickest). The route from Johannesburg to Sydney stays further North to stay with the jet stream (which is now the same direction and therefore beneficial), and the flying time is much less in this direction.
A flight from Wisconsin to Sydney takes 18 hours.
Sydney is in Australia
The distance between the above two places is 4840 miles. This is an approximate direct distance. Also this distance might change if a different flight route is chosen.
The flight distance from Sydney to Perth is 3301 kilometres
The flight time from Lagos, Nigeria to Sydney, Australia is about 19.5 hours.
The flight time from Sydney, Australia to Illinois (IL) is about 18.5 hours.
Sydney to Darwin flight time is about 4.1 hoursand The flight distance is 3146 km.
From Melbourne's CBD to Sydney's CBD is a distance of 869 km (539 miles) by road, travelling the inland route along the Hume Highway. The Flight distance is 713 kilometres (443 miles).