Used 2018 Audi S6 Price in the US
A used 2018 Audi S6 in the US typically lists for $28,625–$32,367, with a median asking price of $30,241 across 12 active US dealer listings (as of 2026-08-30). The cheapest one listed right now is $21,100, a 2018 Quattro Premium Plus in Overland Park, KS — below 95% of the market, so expect an older model year, a base trim or high mileage.
Browse by model year
cheapest per year- All years
- 2025 · from $53,991
- 2024 · from $54,789
- 2023 · from $48,994
- 2022 · from $34,995
- 2021 · from $29,995
- 2020 · from $30,500
- 2018 · from $19,995
- 2017 · from $14,995
- 2016 · from $14,999
- 2015 · from $16,157
- 2014 · from $13,999
- 2013 · from $10,415
- 2010 · from $12,999
- 2009 · from $23,900
- 2008 · from $10,999
- 2007 · from $8,556
- 2002 · from $14,995
Cheapest 10 listed right now
ranked by price-
$21,1002018 Audi S6 Quattro Premium Plus120,243 mi · Overland Park, KS · Overland Park ImportsView listing →
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$23,4212018 Audi S6 Quattro Premium Plus118,845 mi · Quakertown, PA · Trend Auto TraderView listing → -
$26,0002018 Audi S6 Quattro Premium Plus108,185 mi · Kearneysville, WV · Apex Auto Group PreownedView listing → -
$29,5002018 Audi S6 Quattro Prestige84,138 mi · Buffalo Grove, IL · Lux Cars ChicagoView listing → -
$29,5902018 Audi S6 Quattro Premium Plus75,839 mi · Laramie, WY · Laramie GM Auto CenterView listing →
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$29,9002018 Audi S6 Quattro Premium Plus70,276 mi · Oxford, CT · Buonauto EnterprisesView listing → -
$30,5822018 Audi S6 Quattro Prestige67,109 mi · Clearwater, FL · Lexus of ClearwaterView listing → -
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$31,9932018 Audi S6 Quattro Premium Plus71,484 mi · Portland, OR · Summit Motor CompanyView 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 S6 asks $28,625–$32,367. 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 S6 cost?
A used 2018 Audi S6 in the US typically lists for $28,625 to $32,367, with a median asking price of $30,241 across 12 active US dealer listings. Nine in ten are priced between $22,377 and $35,162 (as of 2026-08-30, source: UnderMarket Cars).
Is $30,000 a good price for a used 2018 Audi S6?
That sits at about the market median ($30,241) for a used 2018 Audi S6. Under $28,625 puts you in the cheapest quarter of active US listings and under $22,377 in the cheapest 5%; above $35,162 is the priciest 5% (as of 2026-08-30).
What is the cheapest used 2018 Audi S6 for sale right now?
$21,100 — a 2018 Audi S6 Quattro Premium Plus in Overland Park, KS, $9,141 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 S6 price page at least twice a day. The data date shown on this page is 2026-08-30.
Explore more
Prices updated 2026-08-30. Data covers active dealer listings across the USA.