2021 Audi A3 prices under £20,000

There are 351 used 2021 Audi A3 cars for sale under £20,000 from UK dealers on AskCar, as of 10 November 2026. Typical asking price £16,200 (the median: half cost less, half cost more). The cheapest is £8,900. The middle half are priced between £14,500 and £17,900. Median mileage: about 45,000 miles.

Dealers lowered the asking price on more than a third of 2021 Audi A3 cars under £20,000: 169 of the 351 in the 14 days to 10 November 2026.

AskCar lists 6,789 used Audi A3 across the UK, from 2,285 dealerships.

As of 10 November 2026, AskCar lists 591,054 cars and vans from 12,888 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2021 Audi A3 cars for sale now under £20,000, page 3 of 7

This page lists 2021 Audi A3 cars not picked out on page 1, cheapest first.

The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 6,629 priced Audi A3 adverts on AskCar as of 10 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2021 Audi A3.

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

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