Phoenix is 65% more expensive than St. Louis.
When comparing Phoenix, AZ and St. Louis, MO, the overall cost of living indices are 109 and 66 respectively (national median = 100). Rent is $480/month cheaper in St. Louis, saving renters about $5,760/year.
Median household income is $21,762/year higher in Phoenix. Home values also differ significantly — the median in Phoenix is $381,900 compared to $185,100 in St. Louis.
Arizona has a lower income tax rate, making Phoenix slightly more tax-friendly.
Phoenix vs St. Louis — common questions
Other cost of living comparisons for Phoenix and St. Louis