February 13, 2018 No Comments FREE Combo at White Castle Download the White Castle app and register to get a FREE Combo including 4 American Cheese Sliders, 1 Small French Fry, and 1 Small Soda. Offer available through 4/13/2018. Locator. FREE Combo at White Castle – EXPIRED Facebook Twitter Add Comment Notify me of follow-up comments by email. Notify me of new posts by email.