Yes! Delta Airlines allows passengers to modify their flight schedule. Under Delta Flight Reschedule Rules & policies, you can modify your flight's date, time, and/or itinerary without incurring any fees. If there is still time for your original flight to depart, the airline will allow you to select a different time slot. When it comes to changing your times tables based on your ticket type and the remaining takeoff time, several conditions must be met. 

Contact Delta Airline Service Center at 00 1 800-221-1212 if you want to alter a flight's date, time, or schedule or modify the name on the ticket. Dial +1-800-865-1848. For quick answers and queries, use the third-party agent support number if your call has been disconnected.