To add a checked bag to your Delta flight, follow these steps: Visit the official Delta Airlines website. Log into your Delta Airlines account or create one if you don't have one already. Start a new reservation for your upcoming flight. Enter the required passenger information. Select your flight itinerary. During the booking process, you'll have the option to add checked baggage. Choose the appropriate number of bags. Review your booking details, including your checked baggage selection, and confirm your reservation. Make the necessary payment for your flight and any additional fees, including the cost of your checked bags. After payment is processed, you'll receive a confirmation email with your flight details, including checked baggage information. Prior to your flight, be sure to print your boarding pass, which will include your checked baggage details.