Investigators believe speed was a factor in the crash which likely happened sometime before 6 a.m.
The car — which landed upside down in a bean field — wasn’t discovered until shortly before 5 p.m.
The Cass County Sheriff’s Department reports the vehicle went through a stop sign, struck an embankment and flew over a fence into the field.
The vehicle wasn’t visible from the highway, but workers with a lawn care service noticed track marks off the road and then spotted the car in the field.
Both people inside the car were killed; 22-year-old Jeremiah Ferguson of Omaha and 21-year-old Kelsey Leclaire of Council Bluffs, Iowa.