2021 BMW 3 Series prices

There are 690 used 2021 BMW 3 Series cars for sale from UK dealers on AskCar, as of 8 November 2026. Typical asking price £20,500 (the median: half cost less, half cost more). The cheapest is £10,000. The middle half are priced between £17,800 and £24,000. Median mileage: about 55,000 miles.

Dealers lowered the asking price on more than a third of 2021 BMW 3 Series cars: 275 of the 690 in the 14 days to 8 November 2026.

2021 BMW 3 Series prices by engine and mileage

A 2021 BMW 3 Series 3.0 diesel car typically costs £28,500, against £19,800 for the 2.0 plug-in hybrid, as of 8 November 2026.

A 2021 BMW 3 Series 2.0 plug-in hybrid car with 20,000 to 40,000 miles typically costs £22,000, against £16,900 with 60,000 miles or more.

EngineAll mileagesUnder 20,000 miles20,000 to 40,000 miles40,000 to 60,000 miles60,000 miles or more
2.0 plug-in hybrid£19,800Too few for sale£22,000£20,500£16,900
3.0 diesel£28,500Too few for sale£32,000£29,000£25,000

2021 BMW 3 Series prices by trim

TrimTypical asking price, 2021 cars
M Sport£20,000
M Sport PRO Edition£20,500
SE PRO£14,800
Sport£17,400
Sport PROToo few for sale
SEToo few for sale
M Sport PROToo few for sale

Only 9 of the 2021 BMW 3 Series cars for sale are Sport PRO, too few to give a typical asking price.

Only 7 of the 2021 BMW 3 Series cars for sale are SE, too few to give a typical asking price.

Only 4 of the 2021 BMW 3 Series cars for sale are M Sport PRO, too few to give a typical asking price.

Typical asking prices are of 2021 BMW 3 Series cars for sale on 8 November 2026, and are given only where at least 20 cars with a price are for sale.

2021 BMW 3 Series against other years

A 2020 BMW 3 Series car has a typical asking price of £19,000 and a 2022 one £22,000, as of 8 November 2026.

AskCar lists 7,130 used BMW 3 Series across the UK, from 2,708 dealerships.

As of 8 November 2026, AskCar lists 595,629 cars and vans from 12,891 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2021 BMW 3 Series cars for sale now, page 1 of 14

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. 647 of the 664 cars listed here meet these rules. Pages 2 to 14 list every other 2021 BMW 3 Series car, cheapest first, including the 17 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 6,822 priced BMW 3 Series adverts on AskCar as of 8 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2021 BMW 3 Series.

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 26 cars whose advertised mileage is lower than the mileage recorded at their last MOT test.

Best value 2021 BMW 3 Series: priced furthest below the AskCar estimate

These 10 are priced 12% to 23% under their AskCar estimate. Their asking prices run from £11,995 to £23,850.

Cheapest 2021 BMW 3 Series: the lowest asking prices

These 10 are priced £10,000 to £11,995. They have covered 82,791 to 137,812 miles.

Lowest-mileage 2021 BMW 3 Series

These 10 have covered 3,973 to 15,556 miles. Their asking prices run from £23,000 to £45,000.

Recently reduced 2021 BMW 3 Series: the biggest price reductions in the 14 days to 8 November 2026

The dealer lowered the asking price on each of these 10 in the 14 days to 8 November 2026. Their reductions since AskCar first saw them run from £3,000 to £4,900.

Newly advertised 2021 BMW 3 Series: first seen by AskCar in the 7 days to 8 November 2026

These 10 are the most recently advertised. Cars first seen on the same day are listed cheapest first.

BMW 3 Series by gearbox, fuel and body

BMW 3 Series prices by year

BMW 3 Series by trim

2021 BMW 3 Series by price

2021 BMW 3 Series by trim

BMW 3 Series by price

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