Used 2018 Audi S3 Price in the US
A used 2018 Audi S3 in the US typically lists for $19,500–$27,688, with a median asking price of $22,483 across 14 active US dealer listings (as of 2026-08-30). The cheapest one listed right now is $14,237, a 2018 Quattro Premium Plus in Somerville, NJ — below 95% of the market, so expect an older model year, a base trim or high mileage.
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cheapest per yearCheapest 10 listed right now
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$14,2372018 Audi S3 Quattro Premium Plus110,016 mi · Somerville, NJ · Yosh Motors of SomervilleView listing → -
$15,4992018 Audi S3 Quattro Premium Plus114,263 mi · Chantilly, VA · Autoheaven incView listing → -
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$19,0002018 Audi S3 Quattro Premium Plus81,170 mi · Stone Mountain, GA · United Luxury MotorsView listing →
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$20,9992018 Audi S3 Quattro Premium Plus70,440 mi · Cinnaminson, NJ · Majestic Automotive GroupView listing →
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$22,9772018 Audi S3 Quattro Premium Plus94,968 mi · Milwaukie, OR · Gladstone MitsubishiView listing → -
$23,4992018 Audi S3 Quattro Premium Plus86,000 mi · Auburn, ME · Rennen Performance LLCView listing → -
$27,5002018 Audi S3 Quattro Prestige Technik85,846 mi · Frankfort, IL · Frankfort Auto HausView listing →
These are the bottom of the market, not the going rate — every one is priced below 95% of active listings. A typical used 2018 Audi S3 asks $19,500–$27,688. Cars this far under usually carry an older model year, a base trim or high mileage.
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10 pinnedFAQ
How much does a used 2018 Audi S3 cost?
A used 2018 Audi S3 in the US typically lists for $19,500 to $27,688, with a median asking price of $22,483 across 14 active US dealer listings. Nine in ten are priced between $15,057 and $29,698 (as of 2026-08-30, source: UnderMarket Cars).
Is $22,000 a good price for a used 2018 Audi S3?
That sits at about the market median ($22,483) for a used 2018 Audi S3. Under $19,500 puts you in the cheapest quarter of active US listings and under $15,057 in the cheapest 5%; above $29,698 is the priciest 5% (as of 2026-08-30).
What is the cheapest used 2018 Audi S3 for sale right now?
$14,237 — a 2018 Audi S3 Quattro Premium Plus in Somerville, NJ, $8,246 under the median (as of 2026-08-30).
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?
UnderMarket Cars refreshes US dealer listings continuously and re-generates this used 2018 Audi S3 price page at least twice a day. The data date shown on this page is 2026-08-30.
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Prices updated 2026-08-30. Data covers active dealer listings across the USA.