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There is 1 airport in Koh Samui. Koh Samui Airport (USM) is Koh Samui’s primary airport with at least domestic flights and international flights departing from its runways every week. As of today, airlines operate out of Koh Samui Airport (USM). Koh Samui Airport (USM) is 6.6 miles from Koh Samui and offers nonstop flights to cities.