Olive Garden Coupon Flash Sale! July 23, 2013 by Cady Leave a Comment Yay! Olive Garden is having another lunch coupon flash sale todayl! Just head over here to grab your coupon! Here are the ones up for grabs: 10-11 a.m.: 20% off 11 a.m.-1 p.m.: 15% off This coupon is good for your entire table, and it’s valid until Friday!