There are
1,802 mi
from San Leandro, CA to Watertown, SD
That's the driving distance. It would take 1 day 7 hours to go from San Leandro, California to Watertown, South Dakota.
The flight distance (direct flight from San Leandro, CA to Watertown, SD) is 1,384 mi.
1,802 mi = 2,900.51 kms