American Idol publishes winners and runners-up on its website, AmericanIdol.com, as of 2015. Current information for recent episodes is typically displayed on the website's homepage, while a chronicle of previous seasons is also available.
To find previous winners, click on the "Past Seasons" link on the left-hand side of the homepage. This pulls up icons for each of the seasons so far. Each icon features a picture of the season winner.
The website also publishes current bios on all of its contestants. To access these, click on the "Contestants" link from the homepage. Other options on the website include the option to vote for the performers during each show or watch clips from previously aired shows.