Used 2020 Mercedes-Benz GLB for SaleNationwide

How much does the 2020 Mercedes-Benz GLB cost?

Prices have softened 11.07% compared to this time last year, making it a favorable time to shop this model year.

There are 503 listings available, which suggests you should have a workable selection to compare.

Is the 2020 Mercedes-Benz GLB a good car?

Generally — the 2020 Mercedes-Benz GLB earns a 4.14/5 user rating and an 8.5/10 expert rating. The model scores 10/10 across Form and function, Technology, and Safety.

Owners consistently praise its impressive technology, spacious cabin, and fun-to-drive character. The expert review also highlights its thoughtful details and undeniable practicality, which fit the GLB’s role as a small luxury SUV that prioritizes utility and everyday usefulness.

The trade-offs are that the brakes are lacking and the features many shoppers want can push the price up significantly. That matters because the GLB is aimed at buyers who want a premium badge without giving up usefulness, so you should weigh the strong cabin and tech against the cost of the options you actually want.

With 35.8% of listings marked as good or great deals, there is some room to shop selectively.

Is the 2020 Mercedes-Benz GLB reliable?

Owners rate it 4.14/5, a solid signal of long-term satisfaction.

The owner feedback points to a reliable and dependable feel in everyday use, with praise for its comfortable size, premium features, and versatility. The expert review also describes the GLB as a vehicle that feels special to drive and well suited to quality time behind the wheel, which supports the sense that it is built to be lived with over the long term.

The ownership picture is helped by the standard emergency call service, which is free for as long as you own the GLB.

For used buyers, the main long-term risk is less about outright durability and more about whether the specific car was maintained well and optioned sensibly.

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

Accident-free inventory is solid at 82.3% — always verify the vehicle history report.

You should still check the history report carefully, because a clean listing percentage does not replace documentation. A pre-purchase inspection should focus on the brakes, since the expert review calls them out as a weak point. You should also pay close attention to condition and equipment, because the GLB’s desirability can rise quickly with options.

Key things to evaluate:

• Trim level: The GLB comes in GLB 250 and GLB 250 4Matic form, and the 4Matic version adds all-wheel drive. The base setup is more straightforward, while the better-equipped examples can include the AMG Line design package, larger wheels, ambient lighting, and upgraded audio.
• Powertrain: Both versions use a turbocharged 2.0-liter four-cylinder engine with 221 horsepower and 258 lb-ft of torque, paired with an eight-speed dual-clutch automatic transmission. The 4Matic setup can send power rearward as needed, and an Off-Road driving mode locks in a 50:50 split for maximum traction.
• Safety package: The optional Driver Assistance Package adds adaptive cruise control, lane-centering assistance, evasive steering assistance, automatic emergency stop assistance, and enhanced Pre-Safe functions. Standard safety equipment includes a driver monitoring system, backup camera, forward collision warning with pedestrian detection, automatic emergency braking, and Pre-Safe front collision preparation.
• Infotainment: The standard setup uses MBUX with Android Auto and Apple CarPlay, plus natural voice recognition. The Premium Package upgrades the GLB to twin 10.25-inch displays, and the Multimedia Package adds navigation with augmented video.
• Fuel efficiency: The expert review cites 26 mpg as the EPA estimate and 21.4 mpg on the testing loop.

Which 2020 Mercedes-Benz GLB trim should I buy?

The 2020 Mercedes-Benz GLB is offered in 2 trim levels: GLB 250 and GLB 250 4Matic.

Here's the short version:

• GLB 250: This is the simpler starting point, and it gives you the GLB’s core strengths: the turbocharged 2.0-liter engine, MBUX infotainment, and the roomy, practical cabin. It makes sense if you want the lowest entry price and do not need all-wheel drive.
• GLB 250 4Matic: This is the better-value choice if you want the GLB’s more complete personality, because it adds all-wheel drive and the traction benefits that come with it. If you live where weather or road conditions matter, this is the trim to prioritize.

For safety, the optional Driver Assistance Package is the key add-on to look for on either trim.

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

This is a moderate market for selective buyers, so you can shop with some leverage if you know what you want.

• Deal availability: 35.8% of listings are priced as good or great deals.
• Inventory: There are 503 listings available.
• Price trend: Prices have softened 11.07% compared with last year.
• Clean inventory: 82.3% of listings are accident-free.

If you find a listing below $20,692, that's toward the low end of the year-round range and worth acting on quickly.

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

The current average of $20,694 sits slightly below last year's $23,269.

That decline suggests the GLB has already absorbed a meaningful amount of depreciation, which can help future sellers if they buy at the right price. If you purchase near the current market average or below it, you may have a better chance of limiting your loss when it is time to sell.

The model’s strong owner satisfaction also helps support demand in the used market. Buyers tend to respond well to vehicles that combine premium branding, practicality, and positive ownership feedback.

Vehicles with solid owner satisfaction ratings, like this model year's 4.14/5, tend to retain buyer demand, which supports resale value over time.

Is the 2020 Mercedes-Benz GLB safe?

The 2020 Mercedes-Benz GLB earns a 10/10 safety score from our experts.

Standard safety equipment includes a driver monitoring system, backup camera, forward collision warning with pedestrian detection, automatic emergency braking, and Pre-Safe front collision preparation. The optional Driver Assistance Package adds adaptive cruise control, lane-centering assistance, evasive steering assistance, automatic emergency stop assistance, and enhanced Pre-Safe functions.

You should also note that second-row side-impact airbags and blind-spot monitoring with Exit Warning Assist are available. If you are comparing used examples, the presence or absence of the Driver Assistance Package is one of the most important safety differences to check.

Should I buy a 2020 Mercedes-Benz GLB 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:

• 35.8% of listings are priced as good or great deals.
• Accident-free inventory is solid at 82.3% — always verify the vehicle history report.
• Price trend: Prices have softened 11.07% compared with last year.
• Owners rate it 4.14/5 — a solid satisfaction signal.
• The 2020 GLB stands out for its thoughtful details, impressive technology, and strong practicality.

Consider the 2021 if:

• At $23,305, the 2021 costs more than the current year's $20,694 average.
• It adds an optional third row for seven-passenger seating.

The bottom line: If you want the better value today, the 2020 is the smarter starting point because it has softened in price and still delivers the GLB’s core strengths. If you need extra seating and are willing to pay more, the 2021 is the better path.

These recommendations are based on CarGurus' proprietary market data from September 15, 2026, CarGurus experts' opinions, and generative AI.