There are
1,033 mi
from Yakima, WA to Simi Valley, CA
That's the driving distance. It would take 19 hours 59 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.
1,033 mi = 1.61 kms