2018 BMW 4 Series prices under £20,000

There are 185 used 2018 BMW 4 Series cars for sale under £20,000 from UK dealers on AskCar, as of 9 November 2026. Typical asking price £15,000 (the median: half cost less, half cost more). The cheapest is £7,800. The middle half are priced between £13,500 and £17,000. Median mileage: about 65,000 miles.

Dealers lowered the asking price on more than a third of 2018 BMW 4 Series cars under £20,000: 63 of the 185 in the 14 days to 9 November 2026.

AskCar lists 1,862 used BMW 4 Series across the UK, from 1,077 dealerships.

As of 9 November 2026, AskCar lists 584,619 cars and vans from 12,676 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2018 BMW 4 Series cars for sale now under £20,000, 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. All 181 cars listed here meet these rules. Pages 2 to 4 list every other 2018 BMW 4 Series car, cheapest first.

The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 1,805 priced BMW 4 Series adverts on AskCar as of 9 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2018 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 4 cars whose advertised mileage is lower than the mileage recorded at their last MOT test.

Best value 2018 BMW 4 Series: priced furthest below the AskCar estimate

These 10 are priced 11% to 22% under their AskCar estimate. Their asking prices run from £10,495 to £18,650.

Cheapest 2018 BMW 4 Series: the lowest asking prices

These 10 are priced £7,800 to £10,990. They have covered 75,432 to 121,000 miles.

Lowest-mileage 2018 BMW 4 Series

These 10 have covered 19,000 to 29,500 miles. Their asking prices run from £14,600 to £18,999.

Recently reduced 2018 BMW 4 Series: the biggest price reductions in the 14 days to 9 November 2026

The dealer lowered the asking price on each of these 10 in the 14 days to 9 November 2026. Their reductions since AskCar first saw them run from £1,900 to £2,900.

Newly advertised 2018 BMW 4 Series: first seen by AskCar in the 7 days to 9 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 £20,000 by gearbox, fuel and body

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