Sonic Drive-In welcomes the official start of summer 2013 with half-price shakes on June 20! Come in anytime this Thursday and get any shake at 50% off the regular price. Choose from any of Sonic’s 25 flavors and get it for 50% off, all day long. No coupon is required to get this deal. It’s the Sonic Summer of Shakes!
Offer available only on Thursday, June 20, 2013 at participating restaurants. Most Sonic Drive-In locations will be open regular hours on Independence Day (Thursday, July 4) and open regular hours on Labor Day (Monday, September 2.)