2017 Audi S3 prices under £20,000

There are 107 used 2017 Audi S3 cars for sale under £20,000 from UK dealers on AskCar, as of 7 November 2026. Typical asking price £17,000 (the median: half cost less, half cost more). The cheapest is £10,995. The middle half are priced between £15,700 and £18,500. Median mileage: about 73,000 miles.

Dealers lowered the asking price on more than a quarter of 2017 Audi S3 cars under £20,000: 30 of the 107 in the 14 days to 7 November 2026.

AskCar lists 1,043 used Audi S3 across the UK, from 641 dealerships.

As of 7 November 2026, AskCar lists 601,018 cars and vans from 12,892 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2017 Audi S3 cars for sale now under £20,000, page 1 of 3

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. 100 of the 102 cars listed here meet these rules. Pages 2 to 3 list every other 2017 Audi S3 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 1,017 priced Audi S3 adverts on AskCar as of 7 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2017 Audi S3.

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

Best value 2017 Audi S3: priced furthest below the AskCar estimate

These 10 are priced 8% to 15% under their AskCar estimate. Their asking prices run from £11,950 to £19,995.

Cheapest 2017 Audi S3: the lowest asking prices

These 10 are priced £10,995 to £13,995. They have covered 81,171 to 137,212 miles.

Lowest-mileage 2017 Audi S3

These 10 have covered 19,883 to 50,331 miles. Their asking prices run from £16,995 to £19,995.

Recently reduced 2017 Audi S3: the biggest price reductions in the 14 days to 7 November 2026

The dealer lowered the asking price on each of these 10 in the 14 days to 7 November 2026. Their reductions since AskCar first saw them run from £1,000 to £2,910.

Newly advertised 2017 Audi S3: first seen by AskCar in the 7 days to 7 November 2026

These 7 are the most recently advertised. Cars first seen on the same day are listed cheapest first.

Audi S3 by gearbox, fuel and body

Audi S3 under £20,000 by gearbox, fuel and body

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