If the new flight is priced higher, the customer may change for no change fee but must pay the fare difference. Is there a fee to change my flight on United?After the 24-hour period, United Airlines Change Fees will be $200 to change the date and time of their flights. If your itinerary includes travel within the United States and Canada, there will be no United change flight fee.How much does it cost to change a flight?In some cases, you can make changes to your itinerary with no fee. Every major U.S. airline (except Southwest Airlines) typically charges penalty fees to change or cancel an economy fare flight. The fees can vary from as low as $25 on a domestic flight to more than $400 on an international flight.