2021 Audi A6 Saloon S Line prices

There are 20 used 2021 Audi A6 Saloon S Line cars for sale from UK dealers on AskCar, as of 10 November 2026. Typical asking price £18,700 (the median: half cost less, half cost more). The cheapest is £12,989. The middle half are priced between £16,900 and £20,000. Median mileage: about 66,000 miles.

Dealers lowered the asking price on more than one in ten of 2021 Audi A6 Saloon S Line cars: 4 of the 20 in the 14 days to 10 November 2026.

2021 Audi A6 Saloon S Line prices by engine and mileage

EngineAll mileagesUnder 20,000 miles20,000 to 40,000 miles40,000 to 60,000 miles60,000 miles or more
2.0 diesel£18,700Too few for saleToo few for saleToo few for saleToo few for sale

Typical asking prices are of 2021 Audi A6 Saloon S Line cars for sale on 10 November 2026, and are given only where at least 20 cars with a price are for sale.

2021 Audi A6 Saloon S Line against other years

A 2020 Audi A6 Saloon S Line car has a typical asking price of £18,000, as of 10 November 2026.

AskCar lists 902 used Audi A6 Saloon across the UK, from 658 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 A6 Saloon 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. 19 of the 20 cars listed here meet these rules. Page 2 lists every other 2021 Audi A6 Saloon S Line car, cheapest first, including the one 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 876 priced Audi A6 Saloon adverts on AskCar as of 10 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2021 Audi A6 Saloon 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.

Best value 2021 Audi A6 Saloon S Line: priced furthest below the AskCar estimate

These 10 are priced 2% to 10% under their AskCar estimate. Their asking prices run from £15,770 to £22,995.

Cheapest 2021 Audi A6 Saloon S Line: the lowest asking prices

These 10 are priced £12,989 to £18,498. They have covered 61,487 to 144,000 miles.

Lowest-mileage 2021 Audi A6 Saloon S Line

These 10 have covered 16,206 to 69,561 miles. Their asking prices run from £17,795 to £22,995.

Recently reduced 2021 Audi A6 Saloon S Line: the biggest price reductions in the 14 days to 10 November 2026

The dealer lowered the asking price on each of these 4 in the 14 days to 10 November 2026. Their reductions since AskCar first saw them run from £530 to £1,700.

Newly advertised 2021 Audi A6 Saloon S Line: first seen by AskCar in the 7 days to 10 November 2026

This car is the most recently advertised.

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