Market price · Used 2018 Mercedes-Benz SL-Class 40 listings tracked

Used 2018 Mercedes-Benz SL-Class Price in the US

A used 2018 Mercedes-Benz SL-Class in the US typically lists for $39,758–$52,749, with a median asking price of $43,784 across 40 active US dealer listings (as of 2026-10-17). The cheapest one listed right now is $26,995, a 2018 SL550 in Streamwood, IL — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.

Used 2018 Mercedes-Benz SL-Class · asking prices40 listings

median $43.8k ◀ cheapest $27k

$30k$80k

Typical range: $39,758 – $52,749
Median: $43,784
Cheapest 5%: under $31,890
Cheapest listed now: $26,995

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typical price per year

More years (17)

Cheapest 10 listed right now

ranked by price

$26,995

2018 Mercedes-Benz SL-Class SL550

110,394 mi · Streamwood, IL · Conway Imports
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$29,900

2018 Mercedes-Benz SL-Class SL450

76,920 mi · Asbury Park, NJ · legendcarcompany
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$31,995

2018 Mercedes-Benz SL-Class SL550

95,000 mi · Santa Cruz, CA · Private Seller Exchange
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$32,595

2018 Mercedes-Benz SL-Class SL550

103,122 mi · Rancho Cordova, CA · High Class Auto Sales
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$32,999

2018 Mercedes-Benz SL-Class SL450

72,634 mi · Miami, FL · Florida Fine Cars Miami
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$34,555

2018 Mercedes-Benz SL-Class SL450

72,944 mi · Boca Raton, FL · JIDD Wholesale
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$34,995

2018 Mercedes-Benz SL-Class SL450

72,690 mi · Fuquay-Varina, NC · Karma of Fuquay
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$35,146

2018 Mercedes-Benz SL-Class SL450

71,407 mi · Baton Rouge, LA · Mercedes-Benz of Baton Rouge
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$35,257

2018 Mercedes-Benz SL-Class SL450

58,246 mi · Fishers, IN · Auto Giant USA - Fishers
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$39,637

2018 Mercedes-Benz SL-Class SL550

17,924 mi · Atlanta, GA · America's Xtreme Auto Georgia
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 Mercedes-Benz SL-Class asks $39,758–$52,749. 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 Mercedes-Benz SL-Class cost?

A used 2018 Mercedes-Benz SL-Class in the US typically lists for $39,758 to $52,749, with a median asking price of $43,784 across 40 active US dealer listings. Nine in ten are priced between $31,890 and $78,961 (as of 2026-10-17, source: UnderMarket Cars).

Is $44,000 a good price for a used 2018 Mercedes-Benz SL-Class?

That sits at about the market median ($43,784) for a used 2018 Mercedes-Benz SL-Class. Under $39,758 puts you in the cheapest quarter of active US listings and under $31,890 in the cheapest 5%; above $78,961 is the priciest 5% (as of 2026-10-17).

What is the cheapest used 2018 Mercedes-Benz SL-Class for sale right now?

$26,995 — a 2018 Mercedes-Benz SL-Class SL550 in Streamwood, IL, $16,789 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 Mercedes-Benz SL-Class 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.