There are
651 mi
from Gresham, OR to San Leandro, CA
That's the driving distance. It would take 12 hours 38 mins to go from Gresham, Oregon to San Leandro, California.
The flight distance (direct flight from Gresham, OR to San Leandro, CA) is 537.40 mi.
651 mi = 1,048.45 kms