Summary

• With 137 currently listed for sale near Philadelphia, PA and an average price of $23,275.00, 62.8% of 2021 Mercedes-Benz GLBs for sale on CarGurus are rated as good or great deals.

• Favorably reviewed: Owners rated the 2021 Mercedes-Benz GLB 5 / 5 stars.

• 100.0% of 2021 GLB models on CarGurus are accident free.

• The 2021 Mercedes-Benz GLB offers a flexible interior layout with an optional third row, accommodating up to seven passengers.

Why it stands out

The 2021 Mercedes-Benz GLB distinguishes itself in the luxury SUV market with its versatile design and spacious interior. It features an optional third row of seating, allowing it to comfortably transport up to seven passengers, which is a rarity in its class. The GLB is powered by a turbocharged 2.0-liter inline four-cylinder engine, delivering 221 horsepower and paired with an eight-speed dual-clutch automatic transmission. This setup provides a smooth driving experience, with an impressive fuel economy of up to 30 mpg on the highway. The GLB's interior is a highlight, showcasing high-quality materials and advanced technology, including the latest MBUX infotainment system with voice control. While it excels in many areas, potential buyers should be aware of the cramped third row and some reports of uncomfortable seating. Overall, the 2021 GLB is an appealing choice for families seeking a premium SUV without the hefty price tag typically associated with luxury brands.

Other model years to consider

• 2020 Mercedes-Benz GLB

  • Average price: $17,625.00
  • Good/great deal percentage: 58.8%
  • User rating: 4.14 / 5
  • Total listings: 80

• 2022 Mercedes-Benz GLB

  • Average price: $27,381.00
  • Good/great deal percentage: 64.6%
  • User rating: 4 / 5
  • Total listings: 158

This analysis is based on CarGurus' proprietary market data from July 7, 2026, CarGurus experts' opinions, and generative AI.