Used 2018 Audi S4 Price in the US
A used 2018 Audi S4 in the US typically lists for $20,022–$25,990, with a median asking price of $22,490 across 96 active US dealer listings (as of 2026-10-17). The cheapest one listed right now is $13,995, a 2018 Quattro Premium Plus in Lynnwood, WA — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.
- Typical range
- $20,022 – $25,990
- Median
- $22,490
- Cheapest 5%
- under $16,919
- Cheapest listed now
- $13,995
Browse by model year
typical price per yearCheapest 10 listed right now
ranked by price-
-
$14,9742018 Audi S4 Quattro Premium Plus129,269 mi · Alexandria, VA · CarPlug of AlexandriaView listing → -
$16,0552018 Audi S4 Quattro Premium Plus129,953 mi · Stafford, VA · Pan-American MotorsView listing → -
$16,1982018 Audi S4 Quattro Premium Plus121,785 mi · Suwanee, GA · Auto Deals of Georgia LLCView listing → -
$16,6742018 Audi S4 Quattro Premium Plus140,729 mi · Las Vegas, NV · MINI of Las VegasView listing → -
-
$17,0002018 Audi S4 Quattro Premium Plus132,301 mi · Kansas City, KS · KCK Auto SalesView listing →
-
-
$17,9482018 Audi S4 Quattro Premium Plus100,299 mi · Highland Park, IL · Genesis of Highland ParkView listing → -
$17,9992018 Audi S4 Quattro Premium Plus102,521 mi · Jefferson, GA · Atlanta United MotorsView 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 S4 asks $20,022–$25,990. Cars this far under: expect high mileage, a base trim or a branded title — check the vehicle history.
Deals on the map
10 pinnedFAQ
How much does a used 2018 Audi S4 cost?
A used 2018 Audi S4 in the US typically lists for $20,022 to $25,990, with a median asking price of $22,490 across 96 active US dealer listings. Nine in ten are priced between $16,919 and $31,163 (as of 2026-10-17, source: UnderMarket Cars).
Is $22,000 a good price for a used 2018 Audi S4?
That sits at about the market median ($22,490) for a used 2018 Audi S4. Under $20,022 puts you in the cheapest quarter of active US listings and under $16,919 in the cheapest 5%; above $31,163 is the priciest 5% (as of 2026-10-17).
What is the cheapest used 2018 Audi S4 for sale right now?
$13,995 — a 2018 Audi S4 Quattro Premium Plus 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 S4 page is regenerated from it when it is requested. The figures on this page are from 2026-10-17.
Explore more
Prices updated 2026-10-17. Data covers active dealer listings across the USA.