namibia to madagascar flight

is south african airways the only way to do this flight? i think i have to change in johanessburg.

are there any other airlines offering this flight. looking for one way flight only. thanks

You are correct!

Obviously with Air Namibia and Air Madagascar you can do flights to/from Johannesburg, but for the entire route, then with one carrier, SA.

South African airways will be probably the cheapest option and, as you only want a one way ticket, you don't have to stay overnight in Johannesburg (if you'd want a return one, then you'd have to stay overnight in Johannesburg).
As am021169 has said, Air Madagascar has flights from Antananarivo to Johannesburg and Air Namibia has flights from Johannesburg to Windhoek. With these airlines you don't have either to be overnight in Johannesburg but you'll be on trouble if your first flight is delayed or cancelled because then you'll lose your second one and you'll have to buy a new ticket for that leg.
The direct flight of Comair between Windhoek and Johannesburg isn't good for you because you should be overnight in Johannesburg.

Hi Keninu! When are you going? I'm going next week for 10 days.