2021 Audi A3 prices under £20,000

There are 364 used 2021 Audi A3 cars for sale under £20,000 from UK dealers on AskCar, as of 7 November 2026. Typical asking price £16,300 (the median: half cost less, half cost more). The cheapest is £9,200. The middle half are priced between £14,700 and £18,000. Median mileage: about 44,000 miles.

Dealers lowered the asking price on more than a third of 2021 Audi A3 cars under £20,000: 156 of the 364 in the 14 days to 7 November 2026.

AskCar lists 6,887 used Audi A3 across the UK, from 2,316 dealerships.

As of 7 November 2026, AskCar lists 601,018 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 Audi A3 cars for sale now under £20,000, page 6 of 8

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 6,691 priced Audi A3 adverts on AskCar as of 7 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.

·

Audi A3 by gearbox, fuel and body

Audi A3 under £20,000 by gearbox, fuel and body

Audi A3 prices by year

2021 Audi A3 by price

2021 Audi A3 by trim

Audi A3 by price

Audi A3 near you

More Audi

Same budget

Everything