There are
2,045 mi
from Macomb, IL to Half Moon Bay, CA
That's the driving distance. It would take 1 day 11 hours to go from Macomb, Illinois to Half Moon Bay, California.
The flight distance (direct flight from Macomb, IL to Half Moon Bay, CA) is 1,709.37 mi.
2,045 mi = 3,291.68 kms