Sunday just got a whole lot more delicious—and considerably less expensive. Shake Shack is bringing back its Chicken Sundays promotion, meaning you can score a free Chicken Shack sandwich or Chicken Shack Lettuce Wrap every Sunday when you meet the minimum purchase requirement. Because apparently, the best way to get through Sunday is with crispy chicken and a side of savings.
The deal is refreshingly simple: spend at least $10 on qualifying food or beverages, add a Chicken Shack or Chicken Shack Lettuce Wrap to your order, and enter the promo code CHICKENSUNDAY at checkout. The chicken sandwich itself does not count toward the $10 minimum.
What Is the Shake Shack Free Chicken Sandwich Code?
Write this one down—or, more realistically, copy and paste it:
CHICKENSUNDAY
The code is case sensitive, so make sure you enter it in all caps. The promotion is available on Sundays through December 27, 2026, at participating U.S. Shake Shack locations.
There is a catch, because free chicken apparently cannot exist without a few rules. The offer is valid through the Shake Shack app, shakeshack.com, or at an in-Shack kiosk. It is not valid for drive-thru orders or third-party delivery services such as DoorDash. You can get one free Chicken Shack or Lettuce Wrap per qualifying order.
So, if your Sunday plans involve football, errands, avoiding cooking or simply finding an excuse to eat a crispy chicken sandwich, this is one promo worth remembering.
Bottom line: Spend $10, add the chicken, enter CHICKENSUNDAY, and let Shake Shack handle Sunday dinner.
