Onoppunai Station is served by the Soya Main Line, and lies 183.7 km from the starting point of the line at Asahikawa.

[1] The station consists of two opposed side platforms connected by a level crossing.

With the privatization of Japanese National Railways (JNR), the successor of JGR, on 1 April 1987, JR Hokkaido took over control of the station.

In June 2023, this station was selected to be among 42 stations on the JR Hokkaido network to be slated for abolition owing to low ridership.

[4] According to JR Hokkaidō, only one person uses the station daily, on average.