Shake Shack offers free chicken sandwich every Sunday

Shake Shack is offering a weekly promotion where customers can receive a free Chicken Shack Sandwich or Chicken Shack Lettuce Wrap every Sunday. The offer is valid through December 27, 2026.

To redeem the deal, customers must make a minimum purchase of $10 in food or beverages at participating locations. The cost of the sandwich or wrap itself does not count toward the $10 minimum requirement. The promotion is available for orders placed at in-restaurant kiosks, via the Shake Shack app, or through the company website using the promo code CHICKENSUNDAY.

Specific restrictions apply: the discount excludes paid add-ons such as bacon or avocado, and there is a limit of one free item per order. While the offer is available at participating locations nationwide, some specific sites, such as the Denver International Airport location, may not participate.