2021 Audi A3 S Line prices

There are 210 used 2021 Audi A3 S Line cars for sale from UK dealers on AskCar, as of 11 November 2026. Typical asking price £17,000 (the median: half cost less, half cost more). The cheapest is £11,400. The middle half are priced between £15,500 and £18,200. Median mileage: about 42,000 miles.

Dealers lowered the asking price on more than a third of 2021 Audi A3 S Line cars: 97 of the 210 in the 14 days to 11 November 2026.

2021 Audi A3 S Line prices by engine and mileage

A 2021 Audi A3 S Line 1.5 petrol car typically costs £17,300, against £16,200 for the 1.4 plug-in hybrid, as of 11 November 2026.

A 2021 Audi A3 S Line 1.5 petrol car with 20,000 to 40,000 miles typically costs £18,200, against £14,800 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
1.5 petrol£17,300Too few for sale£18,200£17,000£14,800
1.4 plug-in hybrid£16,200Too few for saleToo few for saleToo few for saleToo few for sale
1.0 petrol£16,500Too few for saleToo few for saleToo few for saleToo few for sale

Only 15 of the 2021 Audi A3 S Line cars for sale have the 2.0 diesel engine, too few to give a typical asking price.

Typical asking prices are of 2021 Audi A3 S Line cars for sale on 11 November 2026, and are given only where at least 20 cars with a price are for sale.

2021 Audi A3 S Line against other years

A 2020 Audi A3 S Line car has a typical asking price of £16,000 and a 2022 one £17,800, as of 11 November 2026.

AskCar lists 6,843 used Audi A3 across the UK, from 2,305 dealerships.

As of 11 November 2026, AskCar lists 593,449 cars and vans from 12,847 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2021 Audi A3 S Line cars for sale now, page 2 of 5

This page lists 2021 Audi A3 S Line cars not picked out on page 1, cheapest first.

The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 6,702 priced Audi A3 adverts on AskCar as of 11 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2021 Audi A3 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 6 cars whose advertised mileage is lower than the mileage recorded at their last MOT test.

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