Dendrobium fleckeri is an epiphytic or lithophytic herb that has cylindrical pseudobulbs long and wide. The pseudobulbs are yellowish green with two or three dark green, egg-shaped leaves long and wide on the end. The flowering stem emerges from the end of the pseudobulb and is long with up to four resupinate, usually apricot-coloured , sometimes yellowish green flowers long and wide. The dorsal sepal is long, wide and the lateral sepals are a similar length but wider. The petals are long and about wide. The labellum is white with a purplish tinge, about long and wide with three lobes. The side lobes are relatively large, upright and pointed and the middle lobe has three keels and dense hairs on its edges. Flowering occurs between August and January.
