Live US dealer listings Median-priced benchmark Updated 2026-10-17
Market price · Used 2018 Mercedes-Benz GLS-Class 275 listings tracked

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

A used 2018 Mercedes-Benz GLS-Class in the US typically lists for $17,350–$23,995, with a median asking price of $19,991 across 275 active US dealer listings (as of 2026-10-17). The cheapest one listed right now is $8,760, a 2018 GLS450-4M in Kissimmee, FL — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.

Used 2018 Mercedes-Benz GLS-Class · asking prices275 listings
$12k$34k
Typical range
$17,350 – $23,995
Median
$19,991
Cheapest 5%
under $13,998
Cheapest listed now
$8,760

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More years (2)

Cheapest 10 listed right now

ranked by price
  1. 2018 Mercedes-Benz GLS-Class
    $8,760
    2018 Mercedes-Benz GLS-Class GLS450-4M
    73,953 mi · Kissimmee, FL · Sunshine Auto Mall
    View listing →
  2. $11,898
    2018 Mercedes-Benz GLS-Class GLS450-4M
    136,176 mi · Miramar, FL · A Auto
    View listing →
  3. $12,000
    2018 Mercedes-Benz GLS-Class GLS450-4M
    127,820 mi · Phoenix, AZ · Baba's Motorsports
    View listing →
  4. $12,000
    2018 Mercedes-Benz GLS-Class GLS450-4M
    155,584 mi · Hudson, FL · Rosa's Auto House
    View listing →
  5. $12,421
    2018 Mercedes-Benz GLS-Class GLS450-4M
    130,185 mi · Chantilly, VA · Auto Deal Makers
    View listing →
  6. $12,500
    2018 Mercedes-Benz GLS-Class GLS450-4M
    112,054 mi · Houston, TX · Lexo Enterprises
    View listing →
  7. $12,999
    2018 Mercedes-Benz GLS-Class GLS450-4M
    120,060 mi · Roy, WA · BandCMotorsports
    View listing →
  8. 2018 Mercedes-Benz GLS-Class
    $13,299
    2018 Mercedes-Benz GLS-Class GLS450-4M
    115,392 mi · Irvington, NJ · General Auto Group
    View listing →
  9. $13,500
    2018 Mercedes-Benz GLS-Class GLS450-4M
    109,250 mi · Van Nuys, CA · Brothers Motors
    View listing →
  10. $13,700
    2018 Mercedes-Benz GLS-Class GLS450-4M
    216,388 mi · Patterson, CA · Jesse's Used Cars
    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 GLS-Class asks $17,350–$23,995. 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 GLS-Class cost?

A used 2018 Mercedes-Benz GLS-Class in the US typically lists for $17,350 to $23,995, with a median asking price of $19,991 across 275 active US dealer listings. Nine in ten are priced between $13,998 and $32,994 (as of 2026-10-17, source: UnderMarket Cars).

Is $20,000 a good price for a used 2018 Mercedes-Benz GLS-Class?

That sits at about the market median ($19,991) for a used 2018 Mercedes-Benz GLS-Class. Under $17,350 puts you in the cheapest quarter of active US listings and under $13,998 in the cheapest 5%; above $32,994 is the priciest 5% (as of 2026-10-17).

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

$8,760 — a 2018 Mercedes-Benz GLS-Class GLS450-4M in Kissimmee, FL, $11,231 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 GLS-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.