Ontario is 11% more expensive than Santa Maria.
When comparing Ontario, CA and Santa Maria, CA, the overall cost of living indices are 152 and 137 respectively (national median = 100). Rent is $74/month cheaper in Santa Maria, saving renters about $888/year.
Median household income is $1,811/year higher in Santa Maria. Home values also differ significantly — the median in Ontario is $568,000 compared to $478,200 in Santa Maria.
Both cities share the same state tax structure since they are in California.
Ontario vs Santa Maria — common questions
Other cost of living comparisons for Ontario and Santa Maria