There are
313 mi
from Farmington Hills, MI to Grayslake, IL
That's the driving distance. It would take 6 hours 1 min to go from Farmington Hills, Michigan to Grayslake, Illinois.
The flight distance (direct flight from Farmington Hills, MI to Grayslake, IL) is 236 mi.
313 mi = 503.05 kms