Shake Shack is offering $5 off online / app orders when you use the promo code: SHACK2020 for a limited time.

Shake Shack is also offering buy 1 burger and get a second burger FREE (up to $7.98) for a limited time. To get this deal, order using their mobile app and use the coupon code: THANKYOU at checkout. Deal expires on January 3, 2021.