Summary

• With 1,009 currently listed for sale and an average price of $23,826.00, 33.4% 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.

• 85.4% of 2021 GLB models on CarGurus are accident free.

• The 2021 Mercedes-Benz GLB offers a flexible interior layout with an optional third row, allowing for a passenger capacity of up to seven.

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, which is a rarity in this segment, accommodating up to seven passengers. This flexibility makes it an appealing choice for families or those needing extra space. 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. Its performance is complemented by a comfortable ride and a well-appointed interior that showcases Mercedes-Benz's commitment to quality and technology. The GLB also boasts a range of advanced safety features, ensuring peace of mind for drivers and passengers alike. While the third row may feel cramped for adults, the overall package of the GLB makes it a strong contender for buyers looking to enter the luxury SUV market without overspending.

Other model years to consider

• 2022 Mercedes-Benz GLB

  • Average price: $27,763.00
  • Good/great deal percentage: 33.7%
  • User rating: 4 / 5
  • Total listings: 1,304

• 2020 Mercedes-Benz GLB

  • Average price: $21,448.00
  • Good/great deal percentage: 29.3%
  • User rating: 4.14 / 5
  • Total listings: 518

This analysis is based on CarGurus' proprietary market data from July 20, 2026, CarGurus experts' opinions, and generative AI.