Based on the fare rules, you may have to pay a service fee and/or a difference in fare. For travel within the 50 United States, Canada, Puerto Rico and the U.S. Virgin Islands, the fee is $200 for Delta-marketed flights.

For travel outside the United States, Canada, Puerto Rico, and the U.S. Virgin Islands, the change fee for Delta-marketed flights is typically $250, but can vary based on location and type of fare. Changes are usually permitted only to the return portion of an international itinerary.