It’s best to confirm with your airline, hotel or credit card whether their rewards expire. Some rewards programs, like Delta SkyMiles, don’t expire, so you don’t have to worry about losing your points. However, other programs have an expiration date, meaning you stand to lose your hard-earned points if you don’t use them within an allotted time. For instance, Citi ThankYou points earned through the Citi Premier card expire after two years.