There are
1,035 mi
from Yakima, WA to Simi Valley, CA
That's the driving distance. It would take 20 hours 9 mins to go from Yakima, Washington to Simi Valley, California.
The flight distance (direct flight from Yakima, WA to Simi Valley, CA) is 856.86 mi.
1,035 mi = 1,664.88 kms