Uncategorized Sonic has 79 cent Jr. Deluxe Cheeseburgers today Casey Dolan - January 14, 2016 9 Sonic Drive-In is serving up 79¢ burgers all day Thursday. You can order up to 5 Jr. Deluxe Cheeseburgers for just 79¢ today, 1/14/16 at participating locations – just make sure you mention the deal while ordering. Enjoy!