2018 Audi A6 Avant S Line prices

There are 26 used 2018 Audi A6 Avant S Line cars for sale from UK dealers on AskCar, as of 9 November 2026. Typical asking price £15,700 (the median: half cost less, half cost more). The cheapest is £9,950. The middle half are priced between £14,000 and £17,700. Median mileage: about 75,000 miles.

Dealers lowered the asking price on more than a quarter of 2018 Audi A6 Avant S Line cars: 7 of the 26 in the 14 days to 9 November 2026.

2018 Audi A6 Avant S Line against other years

A 2019 Audi A6 Avant S Line car has a typical asking price of £18,000, as of 9 November 2026.

AskCar lists 788 used Audi A6 Avant across the UK, from 588 dealerships.

As of 9 November 2026, AskCar lists 584,619 cars and vans from 12,676 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2018 Audi A6 Avant 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. All 24 cars listed here meet these rules. Page 2 lists every other 2018 Audi A6 Avant S Line car, cheapest first.

The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 767 priced Audi A6 Avant adverts on AskCar as of 9 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2018 Audi A6 Avant 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 2018 Audi A6 Avant S Line: priced furthest below the AskCar estimate

These 10 are priced 5% to 14% under their AskCar estimate. Their asking prices run from £9,950 to £20,700.

Cheapest 2018 Audi A6 Avant S Line: the lowest asking prices

These 10 are priced £9,950 to £14,990. They have covered 47,345 to 135,961 miles.

Lowest-mileage 2018 Audi A6 Avant S Line

These 10 have covered 38,406 to 67,000 miles. Their asking prices run from £14,450 to £23,490.

Recently reduced 2018 Audi A6 Avant S Line: the biggest price reductions in the 14 days to 9 November 2026

The dealer lowered the asking price on each of these 6 in the 14 days to 9 November 2026. Their reductions since AskCar first saw them run from £600 to £4,000.

Newly advertised 2018 Audi A6 Avant S Line: first seen by AskCar in the 7 days to 9 November 2026

These 3 are the most recently advertised. Cars first seen on the same day are listed cheapest first.

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