There are
679 mi
from Simi Valley, CA to Klamath Falls, OR
That's the driving distance. It would take 12 hours 33 mins to go from Simi Valley, California to Klamath Falls, Oregon.
The flight distance (direct flight from Simi Valley, CA to Klamath Falls, OR) is 573.18 mi.
679 mi = 1,091.97 kms