To avoid this problem, you should check out carefully Grubhub promo code before that promo code could be expired, some promo codes are tied to a minimum purchase, a first-time purchase, or tied to geography, and other reasons.

Usually, Coupon Stacking is not allowed at Grubhub. However, the store will surely give out notice if available.

Yes. Coupons for each Discount Event of Grubhub will be collected here while being updated day by day. Sometimes, there will be deals not updated promptly but it's rare, we expect sympathy from you. 

The sitewide discount from Grubhub is applied on certain purchases. For Year-End Deals, the store may have its own requirement to offer you a sitewide discount.