There are
1,804 mi
from Grain Valley, MO to Oakley, CA
That's the driving distance. It would take 1 day 7 hours to go from Grain Valley, Missouri to Oakley, California.
The flight distance (direct flight from Grain Valley, MO to Oakley, CA) is 1,483.60 mi.
1,804 mi = 2,903.14 kms