There are
2,198 mi
from Dayton, OH to Simi Valley, CA
That's the driving distance. It would take 1 day 14 hours to go from Dayton, Ohio to Simi Valley, California.
The flight distance (direct flight from Dayton, OH to Simi Valley, CA) is 1,933.15 mi.
2,198 mi = 3,536.75 kms