cost to change a delta flight
1 As of publication, Delta charges $150 to change domestic flights and $250 for international flights. 2  Delta allows you to cancel any flight without penalty within 24 hours of purchase.lick on the flight option that you would like to book. The Delta system will automatically calculate the new cost of the flight, adding the change fees and any increase in fare. If the fare for your new flight is less than what you originally paid, the difference will apply to the change fees.