2021 Audi A5 S Line prices

There are 76 used 2021 Audi A5 S Line cars for sale from UK dealers on AskCar, as of 4 November 2026. Typical asking price £19,500 (the median: half cost less, half cost more). The cheapest is £13,995. The middle half are priced between £18,500 and £21,000. Median mileage: about 51,000 miles.

Dealers lowered the asking price on more than a third of 2021 Audi A5 S Line cars: 27 of the 76 in the 14 days to 4 November 2026.

2021 Audi A5 S Line prices by engine and mileage

A 2021 Audi A5 S Line 2.0 diesel car with 20,000 to 40,000 miles typically costs £21,500, against £18,400 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
2.0 diesel£19,500Too few for sale£21,500£19,500£18,400

Typical asking prices are of 2021 Audi A5 S Line cars for sale on 4 November 2026, and are given only where at least 20 cars with a price are for sale.

2021 Audi A5 S Line against other years

A 2020 Audi A5 S Line car has a typical asking price of £17,300 and a 2022 one £22,000, as of 4 November 2026.

AskCar lists 1,911 used Audi A5 across the UK, from 1,079 dealerships.

As of 4 November 2026, AskCar lists 592,552 cars and vans from 12,964 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2021 Audi A5 S Line cars for sale now, page 1 of 2

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. 72 of the 74 cars listed here meet these rules. Page 2 lists every other 2021 Audi A5 S Line 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 1,865 priced Audi A5 adverts on AskCar as of 4 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2021 Audi A5 S Line.

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

Best value 2021 Audi A5 S Line: priced furthest below the AskCar estimate

These 10 are priced 7% to 15% under their AskCar estimate. Their asking prices run from £16,990 to £22,299.

Cheapest 2021 Audi A5 S Line: the lowest asking prices

These 10 are priced £13,995 to £16,995. They have covered 57,249 to 111,500 miles.

Lowest-mileage 2021 Audi A5 S Line

These 10 have covered 17,325 to 28,160 miles. Their asking prices run from £19,995 to £25,595.

Recently reduced 2021 Audi A5 S Line: the biggest price reductions in the 14 days to 4 November 2026

The dealer lowered the asking price on each of these 10 in the 14 days to 4 November 2026. Their reductions since AskCar first saw them run from £1,600 to £4,000.

Newly advertised 2021 Audi A5 S Line: first seen by AskCar in the 7 days to 4 November 2026

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

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