If you have made a reservation at the Delta Airlines and now you are not able to continue the journey with airlines at the scheduled flight of the airlines thus you need to make an alternate flight by changing the previously scheduled airlines.
(Process for a refundable, non-refundable and award ticket is same)
For travelling within the USA, Canada, Puerto Rico and Virgin Island the change fee is $200 and for flying outside the USA, Canada, Puerto Rico and Virgin Island the change fee starts with $200 depending on the length of flight, location and type of fare.
For most of the tickets, a passenger can change the flight’s date and, time and even the destinations up to 24 hours of the flight departure.
If you are trying to change the ticket less than 24 hours of the flight then you will go to the Same-day confirmed and Same-day standby first part will give you a confirmed seat whereas the later part will make you wait if you are trying to Change Reservation Date on Delta Airlines.If you are still facing any issue then you can establish contact with the customer support of the airlines.