Is there any good route from Lhasa to Kashgar, Xinjiang? It takes 2 days by plane and costs 2000+, and 4 days by train. How can I find the best route? Please recommend

There is no direct flight from Lhasa to Kashgar, and there are very few flights to Kashgar. You can fly from Lhasa to Chengdu or Xi’an, transfer to Urumqi in Chengdu or Xi’an, and then transfer to Kashgar. There are also very few flights from Lhasa to Ali and transfer to Kashgar.