Used 2020 Mercedes-Benz GLS for Sale near Illinois

How much does the 2020 Mercedes-Benz GLS cost?

Prices have softened 15.07% compared to this time last year, making it a favorable time to shop this model year.

There are 764 listings available, which suggests a healthy amount of inventory to compare.

If you find a listing below $32,904.95, that's toward the low end of the year-round range and worth acting on quickly.

Is the 2020 Mercedes-Benz GLS a good car?

Yes — the 5/5 user rating points to strong owner satisfaction. The 2020 GLS stands out as the roomiest vehicle in the Mercedes-Benz lineup, with three rows of seating for six or seven people and up to 94 cubic feet of cargo space. It also blends the comfort and space of the S-Class luxury sedan with some off-road capability, so you get a large luxury SUV that fits both family duty and premium commuting. With 32.9% of listings marked as good or great deals, you have a decent chance of finding a compelling offer if you shop carefully.

Is the 2020 Mercedes-Benz GLS reliable?

Owners rate it 5/5, a strong signal of long-term satisfaction. The 2020 GLS also brings a redesigned second-generation layout, a stretched wheelbase, and a more refined cabin with strong standard technology and convenience features. Mercedes equipped it with items like blind spot assist, 360-degree cameras, adaptive headlamps, auto high beams, parking assist, Car-to-X communication, and Exit Warning Assist, which supports confidence in everyday use. For used buyers, the main long-term ownership risk is making sure the vehicle has been maintained well enough to preserve that high-end comfort and technology.

What should I look for when buying a used 2020 Mercedes-Benz GLS?

Accident-free inventory is solid at 75.7% — always verify the vehicle history report. You should prioritize a pre-purchase inspection that checks the cabin electronics, seating functions, and any signs of wear in a large three-row SUV. Focus on overall condition, because this model’s appeal depends heavily on comfort, technology, and flexibility working as intended.

Is now a good time to buy a used 2020 Mercedes-Benz GLS?

This looks like a moderate, selective buyer’s market, so you can shop with some leverage if you stay disciplined.

• Deal availability: 32.9% of listings are priced as good or great deals.
• Inventory: There are 764 listings available.
• Price trend: Prices have softened 15.07% compared with last year.
• Clean inventory: 75.7% of listings are accident-free.

If you find a listing below $32,904.95, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2020 Mercedes-Benz GLS's resale value?

The current average of $32,859 sits slightly below last year's $38,688. That kind of price movement suggests the market has already absorbed some depreciation, which can help future resale if you buy at the right number. If you pay close to the low end of the range, you give yourself a better chance of limiting your loss when it comes time to sell. Vehicles with strong owner satisfaction ratings, like this model year's 5/5, tend to retain buyer demand, which supports resale value over time.

Should I buy a 2020 Mercedes-Benz GLS or consider a different year?

If you're weighing the 2020 against nearby model years, here's how to think about it:

Choose the 2020 if:

• 32.9% of listings are priced as good or great deals.
• Accident-free inventory is solid at 75.7% — always verify the vehicle history report.
• Price trend: Prices have softened 15.07% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.

Consider the 2021 if:

• At $48,263, the 2021 costs more than the current year's $32,859 average.
• It leans even more heavily into luxury-first comfort and refinement.

The bottom line: If you want the better value, the 2020 is the stronger starting point because it combines a lower average price with solid deal availability and strong owner satisfaction. If you’re price-sensitive, the 2020 is the smarter path; if you’re willing to spend more for a newer luxury-first experience, the 2021 is the alternative to compare.

These recommendations are based on CarGurus' proprietary market data from September 4, 2026, CarGurus experts' opinions, and generative AI.