There are
2,026 mi
from Fairfield, CA to Dekalb, IL
That's the driving distance. It would take 1 day 10 hours to go from Fairfield, California to Dekalb, Illinois.
The flight distance (direct flight from Fairfield, CA to Dekalb, IL) is 1,766.65 mi.
2,026 mi = 3.22 kms