There are
995 mi
from Gresham, OR to La Palma, CA
That's the driving distance. It would take 18 hours 54 mins to go from Gresham, Oregon to La Palma, California.
The flight distance (direct flight from Gresham, OR to La Palma, CA) is 837.90 mi.
995 mi = 1,601.65 kms