Dinnerly Coupon: $15 Off First Box! Posted by Hello Subscription on May 15, 2018. Subscription Box Coupons & Deals / Dinnerly Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification Dinnerly is now offering $15 off your first box when you use coupon code 15OFFMAY at checkout! Ends 6/9. Dinnerly is (one of) the most affordable dinner kits, so this is a fantastic deal!