The average asking price for a used 2018 Mercedes-Benz GLS is $20,808, with 100,982 miles on average, across 97 cars for sale at U.S. dealers as of Nov 10, 2026.
| State | Average asking | Average miles | For sale | Days listed |
|---|---|---|---|---|
| Texas | $23,331 | 93,063 | 10 | 77 |
| Georgia | $18,168 | 109,147 | 7 | 74 |
| New Jersey | $24,592 | 99,517 | 6 | 74 |
| North Carolina | $17,393 | 124,015 | 6 | 91 |
| California | $20,453 | 100,724 | 6 | 135 |
| Massachusetts | $20,558 | 101,220 | 6 | 89 |
| Virginia | $18,348 | 104,834 | 5 | 74 |
Used 2018 Mercedes-Benz GLSs for sale at U.S. dealers ask $20,808 on average (half ask less than $19,995), across 97 cars. The cars for sale have 100,982 miles on average: one with fewer miles is worth more, and one with more is worth less. To check one car's price against cars of its trim and mileage, enter its VIN in OttoQuest's free Deal Check.
The 89 for sale with a listing date have been listed 98 days on average. A car listed much longer than that, or one whose price has already been cut, usually leaves more room to negotiate.
The 2018 asks $20,808 on average with 100,982 miles; the 2017 asks $17,748 with 109,139 miles, and the 2019 asks $23,573 with 84,457 miles.
Used and certified cars for sale at US dealers, each car counted once. Days listed are the dealer’s own days on market where they publish it. Price moves compare the same cars at both ends of the window.
