There are
2,116 mi
from Markham, IL to Pittsburg, CA
That's the driving distance. It would take 1 day 12 hours to go from Markham, Illinois to Pittsburg, California.
The flight distance (direct flight from Markham, IL to Pittsburg, CA) is 1,819.24 mi.
2,116 mi = 3,405.65 kms