There are
708 mi
from Fullerton, CA to Klamath Falls, OR
That's the driving distance. It would take 13 hours 5 mins to go from Fullerton, California to Klamath Falls, Oregon.
The flight distance (direct flight from Fullerton, CA to Klamath Falls, OR) is 614.03 mi.
708 mi = 1,140.20 kms