Datah Dawai Airport (IATA: DTD, ICAO: WALJ) is an airport in Long Lunuk, Long Pahangai, Mahakam Ulu Regency, East Kalimantan, Indonesia. It is the only airport in Mahakam Ulu, providing the only air service in the area. Susi Air has one daily flight from Datah Dawai to Samarinda, for a total of 12 seats daily. The airport was located near Kapuas River, the longest river in Borneo and the longest river in Indonesia. It was surrounded by high trees and green forest.