There are
1,056 mi
from Gresham, OR to San Jacinto, CA
That's the driving distance. It would take 20 hours 8 mins to go from Gresham, Oregon to San Jacinto, California.
The flight distance (direct flight from Gresham, OR to San Jacinto, CA) is 859.71 mi.
1,056 mi = 1.61 kms