There are
2,406 mi
from Dayton, OH to Redwood City, CA
That's the driving distance. It would take 1 day 17 hours to go from Dayton, Ohio to Redwood City, California.
The flight distance (direct flight from Dayton, OH to Redwood City, CA) is 2,044.26 mi.
2,406 mi = 3.22 kms