Fossils have been found from the Kamennyi Yar Formation in Borsky District, Samara Oblast.

The type species Qantas samarensis was named in 2012 and placed in the family Benthosuchidae, as it was viewed as a close relative of Benthosuchus.

The subfamily Qantasinae was established to include Qantas, and possibly the genus Tirraturhinus.

[1] Qantas in a cladogram after Novikov (2018) with only Early Triassic Eastern Europe taxa included:[2]

Luzocephalus Samarabatrachus Parotosuchus Poryolosuchus Selenocara Wetlugasaurus Vladlenosaurus Quantas Syrtosuchus Benthosuchus Vyborosaurus Yarengia Prothoosuchus Thoosuchus Trematotegmen Angusaurus Inflectosaurus Trematosaurus