2018 Audi S4 prices in Illinois
The median asking price for a 2018 Audi S4 in Illinois is $25,975 based on 5 active listings.
As of July 25, 2026, the median asking price for a 2018 Audi S4 in Illinois is $25,975, based on 5 active dealer listings tracked by VinAssessment.
◷ Updated July 25, 2026 ▤ 5 active dealer listings, refreshed daily Methodology →
Typical: $23,969–$28,293 — the middle half of 5 asking prices
Why the wide range? Price depends mostly on configuration and mileage — see below. This spread covers the middle 96% of asking prices: we exclude the cheapest and priciest 2% (payment-priced ads, typos, salvage) so outliers don't distort it.
What moves the price on a 2018 Audi S4
The $23,969–$28,293 typical range isn't randomness — one factor explains most of it:
Asking prices run about $31,959 at 30K–45K miles and fall to $19,857 over 105K miles — roughly $1,600 for every 10,000 miles.
Find your mileage and trim in the configurator below.
Configure the exact car
Modelled from 5 real asking prices, adjusted for mileage and location. Not a formal appraisal.
2018 Audi S4: a fair price for your mileage
A 2018 Audi S4 sheds roughly $1,600 for every 10,000 miles. Find your mileage below.
| Mileage ⓘ | Based on ⓘ | Fair price ⓘ | Typical range ⓘ |
|---|---|---|---|
| 30K–45K miles | 5 listings | $31,959 | $31K–$32K |
| 45K–60K miles | 8 listings | $29,218 | $28K–$30K |
| 60K–75K miles | 15 listings | $26,799 | $26K–$28K |
| 75K–90K miles | 9 listings | $25,349 | $24K–$26K |
| 90K–105K miles | 17 listings | $22,145 | $20K–$23K |
| Over 105K miles | 22 listings | $19,857 | $18K–$21K |
Same trim and condition assumed — mileage is the biggest lever after configuration. National data; Illinois prices track it closely.
Trim-level pricing isn't reliable enough for this model yet — mileage and configuration explain most of the spread above.
Price history
Median asking price by month — national · shaded band is the typical range (25th–75th percentile)
The median listing price for a 2018 Audi S4 is $24,542 (July 2026) — down 9.1% from $26,998 in August 2025.
Monthly price table
| Month | Median price | Typical range | Vehicles listed |
|---|---|---|---|
| July 2026 | $24,542 | $21K–$28K | 92 |
| June 2026 | $24,795 | $22K–$28K | 95 |
| May 2026 | $24,576 | $22K–$28K | 107 |
| April 2026 | $24,995 | $22K–$28K | 91 |
| March 2026 | $24,098 | $22K–$28K | 114 |
| February 2026 | $24,640 | $21K–$27K | 124 |
| January 2026 | $24,792 | $21K–$27K | 100 |
| December 2025 | $24,693 | $21K–$27K | 78 |
| November 2025 | $24,698 | $22K–$27K | 54 |
| October 2025 | $24,995 | $23K–$27K | 60 |
| September 2025 | $26,699 | $24K–$30K | 56 |
| August 2025 | $26,998 | $25K–$29K | 56 |
2018 Audi S4 inventory across the U.S.
Keep exploring S4 prices
2018 Audi S4 · $25,845 typical · 5 listingsOther Audi S4 years
Live 2018 Audi S4 listings, priced by VIN
Every VIN links to a full market report: decode, active listings and the local price band. Shop 2017–2019 Audi S4 listings on VehiSales →.
More 2018 Audi prices
Frequently asked questions
Why do 2018 Audi S4 prices range from $19,393 to $31,699 in Illinois?
The spread comes down to configuration and mileage: higher-mileage, base-configuration examples sit near the low end, while low-mileage and premium configurations reach the top. Half of all listings fall between $23,969 and $28,293 — see the mileage and trim breakdowns above for where a specific vehicle lands.
How much should mileage change the price of a 2018 Audi S4?
Expect roughly $1,600 less for every 10,000 miles on the odometer. A 60K-mile example should cost about $4,800 less than a 30K-mile one of the same trim — check the fair-price-by-mileage table above for your band.
Do Audi S4 prices in Illinois differ from the rest of the country?
Yes. The average in Illinois is $25,845, which is $1,793 above the national average of $24,052. Local supply, demand and transport costs all play a part.
How many 2018 Audi S4 are for sale in Illinois right now?
5 in total, nearly all pre-owned. Counts refresh daily from live dealer inventory.
How we calculate these prices
We track 5 active listings for this vehicle across dealer sites nationwide, updated every day. Average and median are computed from real asking prices on live listings. We exclude the top and bottom 2% of prices to remove data errors, salvage titles, and monthly-payment figures posted as if they were sale prices. Prices reflect dealer asking prices — not final sale prices — and exclude taxes, fees, and incentives. Trim and mileage move the price more than any other factor; see the breakdowns above.
Want the original factory equipment and MSRP behind a specific car? Look up the original Monroney sticker for a 2018 Audi →
Shopping for this car?
Check individual VINs before you buy — decode the exact trim and mileage, see every active listing, and how each price compares to the local market.