There are
1,410 mi
from Simi Valley, CA to Stillwater, OK
That's the driving distance. It would take 1 day 1 hour to go from Simi Valley, California to Stillwater, Oklahoma.
The flight distance (direct flight from Simi Valley, CA to Stillwater, OK) is 1,230.59 mi.
1,410 mi = 1.61 kms