2021 Audi A3 prices

There are 406 used 2021 Audi A3 cars for sale from UK dealers on AskCar, as of 2 November 2026. Typical asking price £16,900 (the median: half cost less, half cost more). The cheapest is £9,400. The middle half are priced between £15,000 and £18,500. Median mileage: about 44,000 miles.

Dealers lowered the asking price on more than a third of 2021 Audi A3 cars: 168 of the 406 in the 14 days to 2 November 2026.

2021 Audi A3 prices by engine and mileage

A 2021 Audi A3 1.5 petrol car typically costs £18,000, against £15,000 for the 1.0 petrol, as of 2 November 2026.

A 2021 Audi A3 1.5 petrol car with 20,000 to 40,000 miles typically costs £18,900, against £15,500 with 60,000 miles or more.

EngineAll mileagesUnder 20,000 miles20,000 to 40,000 miles40,000 to 60,000 miles60,000 miles or more
1.5 petrol£18,000Too few for sale£18,900£17,700£15,500
1.0 petrol£15,000Too few for sale£15,900£14,600Too few for sale
1.4 plug-in hybrid£15,900Too few for sale£17,700£15,900£13,800
2.0 diesel£17,400Too few for saleToo few for saleToo few for saleToo few for sale

2021 Audi A3 prices by trim

TrimTypical asking price, 2021 cars
S Line£17,000
Sport£15,000
Technik£13,800
Edition 1£20,000
S Line CompetitionToo few for sale

Only 7 of the 2021 Audi A3 cars for sale are S Line Competition, too few to give a typical asking price.

Typical asking prices are of 2021 Audi A3 cars for sale on 2 November 2026, and are given only where at least 20 cars with a price are for sale.

2021 Audi A3 against other years

A 2020 Audi A3 car has a typical asking price of £15,000 and a 2022 one £17,500, as of 2 November 2026.

AskCar lists 6,720 used Audi A3 across the UK, from 2,302 dealerships.

As of 2 November 2026, AskCar lists 586,270 cars and vans from 12,920 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, page 1 of 8

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. 374 of the 388 cars listed here meet these rules. Pages 2 to 8 list every other 2021 Audi A3 car, cheapest first, including the 14 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 6,542 priced Audi A3 adverts on AskCar as of 2 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 18 cars whose advertised mileage is lower than the mileage recorded at their last MOT test.

Best value 2021 Audi A3: priced furthest below the AskCar estimate

These 10 are priced 10% to 23% under their AskCar estimate. Their asking prices run from £9,995 to £19,299.

Cheapest 2021 Audi A3: the lowest asking prices

These 10 are priced £9,400 to £11,195. They have covered 84,271 to 135,000 miles.

Lowest-mileage 2021 Audi A3

These 10 have covered 8,950 to 17,350 miles. Their asking prices run from £14,995 to £27,995.

Recently reduced 2021 Audi A3: the biggest price reductions in the 14 days to 2 November 2026

The dealer lowered the asking price on each of these 10 in the 14 days to 2 November 2026. Their reductions since AskCar first saw them run from £2,249 to £5,100.

Newly advertised 2021 Audi A3: first seen by AskCar in the 7 days to 2 November 2026

These 10 are the most recently advertised. Cars first seen on the same day are listed cheapest first.

Audi A3 by gearbox, fuel and body

Audi A3 prices by year

Audi A3 by trim

2021 Audi A3 by price

2021 Audi A3 by trim

Audi A3 by price

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