Used 2021 Mercedes-Benz GLS for Sale near Milwaukee, WI

## Summary - With 915 currently listed for sale on CarGurus and an **average price of $53,258.00**, 33.9% of 2021 Mercedes-Benz GLS models for sale on CarGurus are rated as good or great deals. - **Favorably reviewed:** Owners rated the 2021 Mercedes-Benz GLS 4.93 / 5 stars and CarGurus experts gave it an 8.33 / 10. - **82.6% of 2021 GLS models on CarGurus are accident free**. - The 2021 Mercedes-Benz GLS-Class brings a new level of luxury to full-size SUVs, offering spacious three-row seating with exceptional comfort and a blend of impressive performance features. ## Why it stands out The 2021 Mercedes-Benz GLS excels as a luxurious full-size SUV, setting itself apart with its substantial interior space and top-tier amenities. Notably, it features a sophisticated design with a sleek profile that veils its ample size. The GLS-Class is distinguished by its quiet and spacious cabin, which boasts a massive digital screen that enhances its tech-centric approach. Key improvements include multiple powertrain options ranging from a fuel-efficient inline-six in the GLS 450 to a high-performance V8 in the GLS 580 and AMG GLS 63. However, it's important to note that while the GLS provides an array of luxurious features and top-notch technology, the third-row seating can feel cramped for adult passengers, and its fuel economy might not appeal to all buyers. Overall, the 2021 GLS offers a robust set of features tailored for those seeking comfort, technology, and performance in a luxury SUV. ## Other model years to consider - **[2024 Mercedes-Benz GLS](https://www.cargurus.com/Cars/l-Used-2024-Mercedes-Benz-GLS-c32834)** - Average price: $79,446.00 - Good/great deal percentage: 33.8% - User rating: 5 / 5 - Total listings: 1,267 - **[2020 Mercedes-Benz GLS](https://www.cargurus.com/Cars/l-Used-2020-Mercedes-Benz-GLS-c29210)** - Average price: $35,556.00 - Good/great deal percentage: 34.8% - User rating: 4.83 / 5 - Total listings: 765 - **[2022 Mercedes-Benz GLS](https://www.cargurus.com/Cars/l-Used-2022-Mercedes-Benz-GLS-c31986)** - Average price: $50,650.00 - Good/great deal percentage: 33.4% - User rating: 5 / 5 - Total listings: 979 This analysis is based on CarGurus' proprietary market data from February 10, 2026, CarGurus experts' opinions, and generative AI.