Sonic Drive-In – Multiple Locations POSTED BYLaura Upcoming Events: SONIC Drive-In Happy Hour - 50% Off Drinks & Slushes Daily @ 2:00 pm-4:00 pm (starting April 27, 2018) | Discounted Sonic Drive-In Offers Ongoing Deals (starting December 31, 1969) | Discounted Sonic Drive-In – Multiple Locations CO Visit Website