Generally speaking, the cost for a 19-day group tour in Korla is approximately between 6000 and 15000 yuan. This price usually includes round-trip airfare, hotel accommodation, entrance fees to tourist attractions, etc. However, please note that specific costs can be affected by multiple factors such as the tourist season, hotel standards, transportation methods, and the choice of tourist attractions. Therefore, it is recommended to consult a travel agency or compare prices online in advance to obtain a more accurate quotation.?