There are
2,119 mi
from Markham, IL to Petaluma, CA
That's the driving distance. It would take 1 day 12 hours to go from Markham, Illinois to Petaluma, California.
The flight distance (direct flight from Markham, IL to Petaluma, CA) is 1,853.52 mi.
2,119 mi = 3,410.85 kms