Cinemark movie showtimes are available online on the official Cinemark website, as of 2015. Movies and schedules vary by theater location, which are selectable on the site.
On the main page of the Cinemark website, find the upper navigation bar and press Theaters. Search for a theater by entering the city, state or ZIP code into the Find a Theater box on the Get a Ticket tab and pressing the arrow. The option to search by selecting the View all Cinemark Theaters tab is also available. Scroll to the appropriate theater, and click the name to view a list of movies and showtimes. There is an option to change the date at the top of the list.