The median 2017 Audi S3 in the Canadian market sits at $22,744. That's your anchor. If you're being quoted well above it without a clear reason, you're paying a premium someone else isn't.
Most of these land between $19,120 and $25,371. Cars near the bottom of that band usually carry higher mileage or need something; cars near the top tend to be cleaner or better optioned. A car at $28,000 or a car at $16,000 both deserve a hard look before you commit, because they've stepped outside what the rest of the market is doing.
What the mileage tells you
Median odometer reading is 136,370 km. So a typical S3 at this age has real distance on it, and that's already baked into the median price. If a listing shows meaningfully lower km, expect to pay toward the upper end of that $19,120–$25,371 range. Higher km, push back toward the floor.
We flagged 3 deals on this model year in the last 90 days. Not a flood, but enough to say value listings do surface if you're watching. Set the median as your line in the sand and let the odometer explain any gap from there.
Numbers reflect live listings across Canada over the last 90 days, filtered for outliers. Data as of . Prices in CAD.