2026 Mazda Mazda3 prices under £20,000

There are 88 used 2026 Mazda Mazda3 cars for sale under £20,000 from UK dealers on AskCar, as of 8 November 2026. Typical asking price £18,800 (the median: half cost less, half cost more). The cheapest is £3,295. The middle half are priced between £18,200 and £19,100. Median mileage: about 10,000 miles.

Dealers lowered the asking price on more than half of 2026 Mazda Mazda3 cars under £20,000: 52 of the 88 in the 14 days to 8 November 2026.

AskCar lists 1,248 used Mazda Mazda3 across the UK, from 671 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.

2026 Mazda Mazda3 cars for sale now under £20,000, page 1 of 3

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. 86 of the 88 cars listed here meet these rules. Pages 2 to 3 list every other 2026 Mazda Mazda3 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 1,200 priced Mazda Mazda3 adverts on AskCar as of 8 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2026 Mazda Mazda3.

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.

Best value 2026 Mazda Mazda3: priced furthest below the AskCar estimate

These 10 are priced 7% to 10% under their AskCar estimate. Their asking prices run from £17,599 to £19,995.

Cheapest 2026 Mazda Mazda3: the lowest asking prices

These 10 are priced £17,599 to £17,990. They have covered 10,420 to 13,840 miles.

Lowest-mileage 2026 Mazda Mazda3

These 10 have covered 10 to 6,374 miles. Their asking prices run from £18,999 to £19,995.

Recently reduced 2026 Mazda Mazda3: 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 £2,054 to £2,600.

Newly advertised 2026 Mazda Mazda3: first seen by AskCar in the 7 days to 8 November 2026

These 8 are the most recently advertised. Cars first seen on the same day are listed cheapest first.

Mazda Mazda3 by gearbox, fuel and body

Mazda Mazda3 under £20,000 by gearbox, fuel and body

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