Live US dealer listings Median-priced benchmark Updated 2026-10-17
Market price · Used 2018 Audi S3 28 listings tracked

Used 2018 Audi S3 Price in the US

A used 2018 Audi S3 in the US typically lists for $20,005–$26,046, with a median asking price of $23,493 across 28 active US dealer listings (as of 2026-10-17). The cheapest one listed right now is $14,998, a 2018 Quattro Prestige Technik in Lynnwood, WA — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.

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Cheapest 10 listed right now

ranked by price
  1. 2018 Audi S3
    $14,998
    2018 Audi S3 Quattro Prestige Technik
    124,895 mi · Lynnwood, WA · Sports Cars International
    View listing →
  2. $15,990
    2018 Audi S3 Quattro Premium Plus
    122,991 mi · Oxford, CT · Buonauto Enterprises
    View listing →
  3. 2018 Audi S3
    $16,013
    2018 Audi S3 Quattro Premium Plus
    110,016 mi · Somerville, NJ · Yosh Motors 22
    View listing →
  4. 2018 Audi S3
    $16,550
    2018 Audi S3 Quattro Premium Plus
    114,648 mi · Verona, WI · Private Seller Exchange
    View listing →
  5. 2018 Audi S3
    $17,000
    2018 Audi S3 Quattro Premium Plus
    116,974 mi · Phoenix, AZ · Baba's Motorsports
    View listing →
  6. $18,245
    2018 Audi S3 Quattro Premium Plus
    120,187 mi · Canal Fulton, OH · R21 Motorsports
    View listing →
  7. 2018 Audi S3
    $18,901
    2018 Audi S3 Quattro Premium Plus
    111,403 mi · Hudsonville, MI · Todd Wenzel Superstore
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  8. $20,373
    2018 Audi S3 Quattro Premium Plus
    77,489 mi · Willowbrook, IL · High Line Auto Sales
    View listing →
  9. 2018 Audi S3
    $20,990
    2018 Audi S3 Quattro Premium Plus
    94,969 mi · Klamath Falls, OR · Klamath Falls Subaru
    View listing →
  10. $20,995
    2018 Audi S3 Quattro Premium Plus
    109,002 mi · Salt Lake City, UT · Choice Auto Group
    View 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 $20,005–$26,046. Cars this far under: expect high mileage, a base trim or a branded title — check the vehicle history.

FAQ

How much does a used 2018 Audi S3 cost?

A used 2018 Audi S3 in the US typically lists for $20,005 to $26,046, with a median asking price of $23,493 across 28 active US dealer listings. Nine in ten are priced between $15,998 and $29,525 (as of 2026-10-17, source: UnderMarket Cars).

Is $23,000 a good price for a used 2018 Audi S3?

That sits at about the market median ($23,493) for a used 2018 Audi S3. Under $20,005 puts you in the cheapest quarter of active US listings and under $15,998 in the cheapest 5%; above $29,525 is the priciest 5% (as of 2026-10-17).

What is the cheapest used 2018 Audi S3 for sale right now?

$14,998 — a 2018 Audi S3 Quattro Prestige Technik in Lynnwood, WA, $8,495 under the median (as of 2026-10-17).

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 2018 Audi S3 page is regenerated from it when it is requested. The figures on this page are from 2026-10-17.

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Prices updated 2026-10-17. Data covers active dealer listings across the USA.