Sonic Half Price Shakes After 8 2025. Sonic offers 50% off shakes after 8 pm via app/website in 2024. Why pay sonic for a full price shake when u can go get milk and a half gallon of ice cream for the same price.

This promotion includes a wide selection of flavors, like. Some of sonic’s popular shakes include a coconut cream pie shake, a banana cream pie shake, a peanut butter fudge.