Used 2018 Audi S5 Price in the US
A used 2018 Audi S5 in the US typically lists for $21,566–$27,990, with a median asking price of $24,495 across 241 active US dealer listings (as of 2026-10-19). The cheapest one listed right now is $14,636, a 2018 Quattro Premium Plus in Concord, CA — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.
- Typical range
- $21,566 – $27,990
- Median
- $24,495
- Cheapest 5%
- under $16,900
- Cheapest listed now
- $14,636
Browse by model year
typical price per yearCheapest 10 listed right now
ranked by price-
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$14,9992018 Audi S5 Quattro Premium Plus119,900 mi · Worcester, MA · Vix Auto SalesView listing → -
$15,0872018 Audi S5 Quattro Premium Plus112,608 mi · Butler, NJ · The Car House of ButlerView listing →
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$15,2302018 Audi S5 Quattro Prestige Technik115,574 mi · Hollywood, FL · Amaan MotorsView listing →
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$15,8802018 Audi S5 Quattro Premium Plus115,069 mi · Jacksonville, FL · Dream MotorsView listing → -
$15,9882018 Audi S5 Quattro Premium Plus117,241 mi · North Salt Lake, UT · CarZillaView listing → -
$15,9982018 Audi S5 Quattro Premium Plus127,000 mi · Buford, GA · Atlanta Luxury MotorsView listing → -
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$16,4952018 Audi S5 Quattro Prestige Technik116,420 mi · Miami, FL · Auto Club Of MiamiView listing → -
$16,6982018 Audi S5 Quattro Premium Plus133,900 mi · Snellville, GA · Philip 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 S5 asks $21,566–$27,990. 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 S5 cost?
A used 2018 Audi S5 in the US typically lists for $21,566 to $27,990, with a median asking price of $24,495 across 241 active US dealer listings. Nine in ten are priced between $16,900 and $31,998 (as of 2026-10-19, source: UnderMarket Cars).
Is $24,000 a good price for a used 2018 Audi S5?
That sits at about the market median ($24,495) for a used 2018 Audi S5. Under $21,566 puts you in the cheapest quarter of active US listings and under $16,900 in the cheapest 5%; above $31,998 is the priciest 5% (as of 2026-10-19).
What is the cheapest used 2018 Audi S5 for sale right now?
$14,636 — a 2018 Audi S5 Quattro Premium Plus in Concord, CA, $9,859 under the median (as of 2026-10-19).
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 S5 page is regenerated from it when it is requested. The figures on this page are from 2026-10-19.
Explore more
Prices updated 2026-10-19. Data covers active dealer listings across the USA.