In economy class on flights in the US, Delta normally charges $30 for the first checked bag, as long as it's not oversize or overweight. To qualify for a free checked bag from your Delta credit card, your bag must weigh under 50 pounds and not exceed 62 inches when you total length + width + height.  If you have a second bag to check, you'll be charged a fee of $40 (assuming it's not oversize/overweight).  Other Delta baggage fees vary by route and class of service. You can find out the fees for your specific ticket by entering your flight details on Delta's baggage website.