Delta offers several ways to check in. Online check-in begins 24 hours before departure and allows passengers to select seats, add bags, and obtain boarding passes. The Delta app makes check-in easy, providing digital boarding passes and real-time flight updates. At the airport, kiosks and staffed counters are available for travelers needing extra assistance. For international flights, earlier check-in is encouraged due to document verification. To learn about the best check-in option for your itinerary or if you encounter issues while checking in, contact Delta support directly at 877-297-0699.