There are
1,822 mi
from Redwood City, CA to Watertown, SD
That's the driving distance. It would take 1 day 7 hours to go from Redwood City, California to Watertown, South Dakota.
The flight distance (direct flight from Redwood City, CA to Watertown, SD) is 1,395.90 mi.
1,822 mi = 2,932.81 kms