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Yes. Bangkok Airways flies nonstop from Na Thon (USM) to Chiang Mai (CNX). The flight takes about 1h 49m and covers 641 miles (1,032 km).
Bangkok Airways operates nonstop flights from Na Thon to Chiang Mai.
The nonstop flight from Na Thon to Chiang Mai takes ~1h 49m (approximately 1032 km).