Thousands of feet high! Curt has been 14,500 feet in Australia and 16,500 feet in the USA. -If in a "thermal" (warm rising air), you can go as high as the clouds! And when soaring the "ridge lift" on a mountain, it will depend on the shape/size of the mountain and the direction/strength of the wind. Our tandem hang gliding flights at Stanwell Tops often take us to altitudes hundreds of feet higher than the launch site of Bald Hill. At Hill 60, of Port Kembla, we often double the altitude of the lookout/launch site.