Delta Same Day Flight Change To request a same-day flight change, you can do so within 24 hours prior to the departure time of your original flight. However, the changes are limited to flights departing on the same day of the ticketed departure. It's important to note that changes are subject to availability, and fees may apply depending on the fare type and ticket rules. Delta Same Day Flight Change Lines allows for same-day flight changes. Same-day flight changes refer to making a flight change within 24 hours of the originally scheduled departure time and flying within the United States, Puerto Rico, or the U.S. Virgin Islands. https://www.skycoair.com/blog/delta-same-day-flight-change-policy/