2021 Mercedes-Benz GLB prices

This 2021 Mercedes-Benz GLB is no longer listed. Here are similar cars for sale now.

There are 84 used 2021 Mercedes-Benz GLB cars for sale from UK dealers on AskCar, as of 7 November 2026. Typical asking price £21,500 (the median: half cost less, half cost more). The cheapest is £15,795. The middle half are priced between £19,900 and £23,000. Median mileage: about 47,000 miles.

Dealers lowered the asking price on more than a third of 2021 Mercedes-Benz GLB cars: 36 of the 84 in the 14 days to 7 November 2026.

2021 Mercedes-Benz GLB prices by engine and mileage

A 2021 Mercedes-Benz GLB 2.0 diesel car typically costs £23,000, against £21,000 for the 1.3 petrol, as of 7 November 2026.

EngineAll mileagesUnder 20,000 miles20,000 to 40,000 miles40,000 to 60,000 miles60,000 miles or more
1.3 petrol£21,000Too few for sale£22,000Too few for saleToo few for sale
2.0 diesel£23,000Too few for saleToo few for saleToo few for saleToo few for sale

Only 1 of the 2021 Mercedes-Benz GLB cars for sale have the 1.9 diesel engine, too few to give a typical asking price.

2021 Mercedes-Benz GLB prices by trim

TrimTypical asking price, 2021 cars
AMG Line Premium£22,000
AMG Line£20,000
AMG Line Premium PlusToo few for sale

Only 14 of the 2021 Mercedes-Benz GLB cars for sale are AMG Line Premium Plus, too few to give a typical asking price.

Typical asking prices are of 2021 Mercedes-Benz GLB cars for sale on 7 November 2026, and are given only where at least 20 cars with a price are for sale.

2021 Mercedes-Benz GLB against other years

A 2020 Mercedes-Benz GLB car has a typical asking price of £21,000 and a 2022 one £22,500, as of 7 November 2026.

AskCar lists 873 used Mercedes-Benz GLB across the UK, from 394 dealerships.

As of 7 November 2026, AskCar lists 601,018 cars and vans from 12,892 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2021 Mercedes-Benz GLB cars for sale now, page 1 of 2

This page picks out up to 10 cars in each of these groups: best value, cheapest, lowest mileage, recently reduced and newly advertised. A car in more than one group is listed in full once. The groups pick only from cars with photos and an AskCar estimate, priced at £500 or more and no more than 25% under that estimate. 77 of the 83 cars listed here meet these rules. Page 2 lists every other 2021 Mercedes-Benz GLB car, cheapest first, including the 6 the groups do not pick from.

The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 841 priced Mercedes-Benz GLB adverts on AskCar as of 7 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2021 Mercedes-Benz GLB.

Each car: year, make, model, engine and trim, power, gearbox, fuel, body, doors, colour; mileage; price and its changes; how the price compares with the AskCar estimate; emissions standard and ULEZ compliance where it holds; MOT; dealer and town; AskCar page. Each car's AskCar page has its full price history and cheaper cars like it.

This list leaves out 1 car whose advertised mileage is lower than the mileage recorded at its last MOT test.

Best value 2021 Mercedes-Benz GLB: priced furthest below the AskCar estimate

These 10 are priced 5% to 12% under their AskCar estimate. Their asking prices run from £18,990 to £24,250.

Cheapest 2021 Mercedes-Benz GLB: the lowest asking prices

These 10 are priced £15,795 to £18,495. They have covered 62,621 to 101,000 miles.

Lowest-mileage 2021 Mercedes-Benz GLB

These 10 have covered 13,861 to 29,550 miles. Their asking prices run from £20,990 to £33,495.

Recently reduced 2021 Mercedes-Benz GLB: the biggest price reductions in the 14 days to 7 November 2026

The dealer lowered the asking price on each of these 10 in the 14 days to 7 November 2026. Their reductions since AskCar first saw them run from £1,750 to £8,520.

Newly advertised 2021 Mercedes-Benz GLB: first seen by AskCar in the 7 days to 7 November 2026

These 6 are the most recently advertised. Cars first seen on the same day are listed cheapest first.

Mercedes-Benz GLB by gearbox, fuel and body

Mercedes-Benz GLB prices by year

Mercedes-Benz GLB by trim

2021 Mercedes-Benz GLB by trim

Mercedes-Benz GLB by price

Mercedes-Benz GLB near you

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