There are
2,100 mi
from Markham, IL to Oakley, CA
That's the driving distance. It would take 1 day 12 hours to go from Markham, Illinois to Oakley, California.
The flight distance (direct flight from Markham, IL to Oakley, CA) is 1,810.99 mi.
2,100 mi = 3,378.84 kms