Question: are shakes half off at sonic?
Answer: Sonic Drive-In: 50% Off Shakes After 8pm. The sweet offer ended September 2, 2019. We've contacted Sonic Drive-In and have been told that, for now, the deal is on hold for 2020. ... The burger chain's daily half-price Happy Hour on drinks and slushes from 2 p.m. to 4 p.m. does not include shakes.