There are
2,141 mi
from Markham, IL to Pacifica, CA
That's the driving distance. It would take 1 day 12 hours to go from Markham, Illinois to Pacifica, California.
The flight distance (direct flight from Markham, IL to Pacifica, CA) is 1,859.64 mi.
2,141 mi = 3,445.74 kms