About $1,554 a year for full coverage on a national average — 8% more than the $1,438 average car. Insurers rate the Cadillac STS at an index of 108 where 100 is a typical vehicle, based on how often and how expensively these cars actually generate claims (latest data covers 2009-2011).
The premium isn't spread evenly across the Cadillac STS: Comprehensive — theft, weather, vandalism, animals — carries its highest loss index at 131, while Collision sits at 85. Those 46 points are the real reason behind the price, and they are the part a quote form never shows you. Against what the car is worth the bill looks different again: a 2009 STS sells for a median $5,980, so a year of cover costs 26% of the car's value. Calculated from 9 insurance-loss records and live US listing prices.
Why a STS costs what it does
Insurers don't price a car with one number — they track losses separately for each kind of cover. An index of 100 is the average vehicle, so anything above means this model generates costlier claims of that type:
Read it as «where the money goes». A high Collision figure means these cars are expensive to repair after a crash; a high Comprehensive figure points at theft, weather and vandalism instead. Estimated annual split at $1,554: Liability (BI + PD) $746 · Collision $435 · Comprehensive $186 · Other (UM / PIP) $186.
How it changed by generation
Insurance-loss index of the STS across every generation in the data. Newer isn't automatically cheaper — driver-assist systems cut crash frequency, while sensors and aluminium panels push repair bills up:
Each point averages every recorded variant of that generation. The STS has held a steady loss index across generations.
What a STS costs by state
Where you park matters as much as what you drive. The STS's index applied to each state's average premium — the same car, the same cover, different postcode:
| State | STS est. / yr | vs national |
|---|---|---|
| Florida | +39% vs US | |
| Louisiana | +38% vs US | |
| New York | +32% vs US | |
| District of Columbia | +26% vs US | |
| Georgia | +21% vs US | |
| Texas | +20% vs US | |
| Wisconsin | -31% vs US | |
| Hawaii | -31% vs US | |
| Idaho | -32% vs US | |
| North Dakota | -33% vs US | |
| Vermont | -33% vs US | |
| Maine | -36% vs US |
Six priciest and six cheapest states shown. Figures are the state's average premium scaled by the Cadillac STS's loss index of 108 — your own quote also depends on age, record, deductible and ZIP.
Cadillac STS insurance — frequently asked
How much is insurance for a Cadillac STS?
About $1,554 a year for full coverage at the national average, versus $1,438 for a typical car. That's the model's insurance-loss index of 108 applied to the US average premium.
Why is the STS expensive or cheap to insure?
For the Cadillac STS the costliest area is Comprehensive at an index of 131, covering theft, weather, vandalism, animals — against 85 for its cheapest. Insurers set premiums from claim history like that, not from the sticker price — which is why the Cadillac STS lands at 108, not at what it costs new.
Is that a lot relative to the car's value?
A year of cover is 26% of what a 2009 STS sells for — $1,554 against a median price of $5,980. Cheap cars often show a higher percentage even when the dollar premium is lower, and at 26% the STS sits on the expensive side of that trade.
Where does this data come from?
Insurance-loss indices published for real vehicles, combined with NAIC state average premiums. It's claim history, not a quote engine — so it shows what these cars actually cost insurers rather than what one company would offer you.
Will my own quote match this?
Treat it as a baseline for the car itself. Your figure also moves with age, driving record, deductible, mileage and ZIP code — the same STS can differ by hundreds between two drivers.
How we work this out
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