To check in for a Delta flight, you have several options: online via the Delta website, mobile app, airport self-service kiosks, curbside check-in, or at the airport check-in counter. Online check-in opens 24 hours before your scheduled departure and closes 30 minutes prior for domestic flights and 60 minutes prior for international flights. To check in online, visit the Delta website or open the Fly Delta app, enter your booking reference and last name, select your flight, choose or confirm your seat, and provide any necessary travel information. After completing online check-in, you can download or print your boarding pass. If you have checked baggage, you must drop it off at the airport before the check-in desk closes. At the airport, self-service kiosks are available where you can enter your booking details, print your boarding pass, and baggage tags. Attach the tags to your luggage and drop it off at the bag drop area. If you prefer assistance or have special needs, you can check in at the airport counter. Arrive at the airport at least 2 hours before departure for domestic flights and 3 hours before for international flights to allow enough time for check-in, security screening, and boarding. For international flights, Delta recommends arriving at least 4 hours before departure when traveling from an international (non-U.S.) airport. Ensure you have all necessary travel documents, including your passport, visa (if applicable), and any required health documentation. Following these guidelines helps ensure a smooth check-in process and timely boarding.