Delta provides an online check-in service within 24 hours of your departure. The online platform also makes allowance for redeeming your Sky Miles and accepts all major credit and debit card payments.
When travelling within the United States the recommended check-in time is two hours and you must be checked in at least half and hour minutes before departure. You will need to be at the gate 15 minutes before your flight leaves. For international flights check-in time is 3 hours before departure, and you need to allow at least 60 minutes before your flight leaves and be ready to board at least 45 minutes before departure time.