SR 931 begins at an interchange with US 31 south of Kokomo, passing through farmland and residential properties.

After crossing SR 26, the road passes through a commercial section of Kokomo.

SR 931 runs through Lakeville then traverses a rural area briefly before reaching the southern edge of the South Bend urban area at its northern end.

[4][5][6] In 2014 the segment of US 31 freeway from US 30 near Plymouth to US 20 (St. Joseph Valley Parkway) in South Bend opened, and the segment of what had been US 31 in St. Joseph County outside of South Bend became SR 931.

[7][8] This segment had been expected to be removed from the state highway system in mid-2018.