2021 BMW 4 Series prices under £30,000

There are 172 used 2021 BMW 4 Series cars for sale under £30,000 from UK dealers on AskCar, as of 8 November 2026. Typical asking price £24,500 (the median: half cost less, half cost more). The cheapest is £17,490. The middle half are priced between £23,000 and £26,500. Median mileage: about 46,000 miles.

Dealers lowered the asking price on more than a third of 2021 BMW 4 Series cars under £30,000: 76 of the 172 in the 14 days to 8 November 2026.

AskCar lists 1,873 used BMW 4 Series across the UK, from 1,080 dealerships.

As of 8 November 2026, AskCar lists 595,762 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 BMW 4 Series cars for sale now under £30,000, page 1 of 4

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. 162 of the 164 cars listed here meet these rules. Pages 2 to 4 list every other 2021 BMW 4 Series car, cheapest first, including the 2 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 1,816 priced BMW 4 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 4 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 8 cars whose advertised mileage is lower than the mileage recorded at their last MOT test.

Best value 2021 BMW 4 Series: priced furthest below the AskCar estimate

These 10 are priced 9% to 18% under their AskCar estimate. Their asking prices run from £18,995 to £28,490.

Cheapest 2021 BMW 4 Series: the lowest asking prices

These 10 are priced £17,490 to £19,900. They have covered 49,500 to 97,000 miles.

Lowest-mileage 2021 BMW 4 Series

These 10 have covered 9,654 to 22,399 miles. Their asking prices run from £24,811 to £29,290.

Recently reduced 2021 BMW 4 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 £2,500 to £5,840.

Newly advertised 2021 BMW 4 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 4 Series by gearbox, fuel and body

BMW 4 Series under £30,000 by gearbox, fuel and body

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