There are
765 mi
from Olathe, KS to Romulus, MI
That's the driving distance. It would take 14 hours 18 mins to go from Olathe, Kansas to Romulus, Michigan.
The flight distance (direct flight from Olathe, KS to Romulus, MI) is 641.91 mi.
765 mi = 1,231.66 kms