Sonic welcomes back its popular Sonic Nights promotion where anyone can get half-price shakes every night after 8 p.m. at participating locations through September 2, 2019. To sweeten the deal this year, Sonic is adding ..
Sonic is running a special promotion on March 8, 2018 where you can get half-price shakes, floats and Ice Cream Slushes. The deal will be available all-day at participating locations on Thursday, March 8. No ..