Used 2021 Audi S4 Price in the US
A used 2021 Audi S4 in the US typically lists for $30,596–$38,790, with a median asking price of $35,956 across 30 active US dealer listings (as of 2026-10-15). The cheapest one listed right now is $23,300, a 2021 Quattro Premium Plus in Littleton, CO — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.
Browse by model year
typical price per yearCheapest 10 listed right now
ranked by price-
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$24,9502021 Audi S4 Quattro Prestige106,277 mi · Franktown, CO · Sterling Auto SalesView listing →
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$24,9982021 Audi S4 Quattro Premium Plus83,697 mi · San Antonio, TX · CavenderBuickGMC UsedView listing → -
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$28,2862021 Audi S4 Quattro Premium Plus87,888 mi · West Bridgewater, MA · S&D Auto Sales (West Bridgewater)View listing → -
$29,9892021 Audi S4 Quattro Prestige68,927 mi · Doylestown, PA · Fred Beans Chrysler Dodge Jeep RamView listing → -
$32,4162021 Audi S4 Quattro Premium Plus56,945 mi · Libertyville, IL · McGrath Acura of LibertyvilleView listing → -
$32,9842021 Audi S4 Quattro Premium54,127 mi · Eden Prairie, MN · iDeal Auto ImportsView listing →
These are the bottom of the market, not the going rate — every one is priced below 95% of active listings. A typical used 2021 Audi S4 asks $30,596–$38,790. Cars this far under: expect high mileage, a base trim or a branded title — check the vehicle history.
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10 pinnedFAQ
How much does a used 2021 Audi S4 cost?
A used 2021 Audi S4 in the US typically lists for $30,596 to $38,790, with a median asking price of $35,956 across 30 active US dealer listings. Nine in ten are priced between $24,532 and $41,338 (as of 2026-10-15, source: UnderMarket Cars).
Is $36,000 a good price for a used 2021 Audi S4?
That sits at about the market median ($35,956) for a used 2021 Audi S4. Under $30,596 puts you in the cheapest quarter of active US listings and under $24,532 in the cheapest 5%; above $41,338 is the priciest 5% (as of 2026-10-15).
What is the cheapest used 2021 Audi S4 for sale right now?
$23,300 — a 2021 Audi S4 Quattro Premium Plus in Littleton, CO, $12,656 under the median (as of 2026-10-15).
Are these MSRP or real asking prices?
Real asking prices from active US dealer listings, deduplicated by VIN — not manufacturer MSRP. They already reflect dealer discounts, and they exclude tax, title, registration and dealer fees.
How often are prices updated?
The listing data behind UnderMarket Cars is rebuilt from live US dealer inventory every few hours, and this used 2021 Audi S4 page is regenerated from it when it is requested. The figures on this page are from 2026-10-15.
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Prices updated 2026-10-15. Data covers active dealer listings across the USA.