2018 Audi S4 prices

There are 15 used 2018 Audi S4 cars for sale from UK dealers on AskCar, as of 6 November 2026. Typical asking price £20,000 (the median: half cost less, half cost more). The cheapest is £14,995. The middle half are priced between £17,600 and £21,000. Median mileage: about 65,000 miles.

Dealers lowered the asking price on 1 of the 15 2018 Audi S4 cars in the 14 days to 6 November 2026.

AskCar lists 95 used Audi S4 across the UK, from 84 dealerships.

As of 6 November 2026, AskCar lists 598,752 cars and vans from 12,905 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2018 Audi S4 cars for sale now

This page picks out up to 10 cars in each of these groups: best value, cheapest, lowest mileage and recently reduced. 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 14 cars listed here meet these rules.

The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 93 priced Audi S4 adverts on AskCar as of 6 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2018 Audi S4.

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 1 car whose advertised mileage is lower than the mileage recorded at its last MOT test.

Best value 2018 Audi S4: priced furthest below the AskCar estimate

Their asking prices run from £14,995 to £23,995.

Cheapest 2018 Audi S4: the lowest asking prices

These 10 are priced £14,995 to £20,900. They have covered 45,000 to 90,000 miles.

Lowest-mileage 2018 Audi S4

These 10 have covered 15,778 to 69,673 miles. Their asking prices run from £17,990 to £23,995.

Recently reduced 2018 Audi S4: the biggest price reductions in the 14 days to 6 November 2026

The dealer lowered the asking price on this car in the 14 days to 6 November 2026.

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