There are
2,057 mi
from Markham, IL to Poway, CA
That's the driving distance. It would take 1 day 12 hours to go from Markham, Illinois to Poway, California.
The flight distance (direct flight from Markham, IL to Poway, CA) is 1,709.71 mi.
2,057 mi = 3,310.01 kms