M-37 starts joined with Business Loop I-94 (BL I-94) as the two highway designations run concurrently at exit 92 on I-94 southwest of Battle Creek. They follow Columbia Avenue and pass around the southern side of the W. K. Kellogg Airport. When the roadway meets M-96, BL I-94/M-37 turns northward, joining M-96 around the eastern end of the airport to Dickman Road. M-37 jogs westerly onto Dickman Road before continuing northward Helmer Road through suburban residential areas in Springfield and across the Kalamazoo River into Level Park-Oak Park. There the highway intersects M-89, passes through more residential areas and exits the Battle Creek metro area.