There are
2,107 mi
from Decatur, IL to Redwood City, CA
That's the driving distance. It would take 1 day 12 hours to go from Decatur, Illinois to Redwood City, California.
The flight distance (direct flight from Decatur, IL to Redwood City, CA) is 1,792.53 mi.
2,107 mi = 3.22 kms