There are
767 mi
from Oceanside, CA to Klamath Falls, OR
That's the driving distance. It would take 14 hours 14 mins to go from Oceanside, California to Klamath Falls, Oregon.
The flight distance (direct flight from Oceanside, CA to Klamath Falls, OR) is 668.40 mi.
767 mi = 1,233.85 kms