These specimens are small, just over 4 cm (1.5 inches) long, and if its legs and feet were not excessively shortened in relation to the body, the bird was about the size of a large blackbird in life.

Metatarsal II (the innermost preserved bone of the tarsometatarsus) has a very broad and pulley-shaped trochlea (toe joint).

A small phylogenetic analysis performed during its initial description in 1993 found several most parsimonious trees with conflicting results.

Some placed it as a closer relative of avisaurids than Lectavis bretincola (an unusually long-legged enantiornithean discovered in the same deposit) was.

However, other most parsimonious trees offered the opposite result, with Lectavis being a closer relative of avisaurids than Yungavolucris.

If Yungavolucris had both unusually short and wide legs, it might have been the size of the small species of Martinavis or maybe the slightly larger Elbretornis.