The US and China are both big places. The answer depends on where in the US you start from,
and where in China you end up.
In spite of the wording in the question that asks for "miles ... in metric system", here is the distance
in both systems, for a few possible itineraries:
-- Dillingham, AK to Hegang . . . . . 2,905 miles (4,675 km)
-- Washington, DC to Beijing . . . . 6,930 miles (11,153 km)
-- Brownsville, TX to Hotan . . . . . . 8,080 miles (13,003 km)
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