There are no open border points between India and China since the war in -62. You have the overland option via Kathmandu , and ( uncertain about flights in the winter ) flying Kathmandu-Chengdu . NB : if you enter China via Tibet ( which will be closed in March at least , same as the preceding three years ) you´ll get a non-extendable max four weeks stay in China, starting when you leave Nepal.
Thank you very much.
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