Learn how to change United Flights through the website? You'll change your United Airlines flight according to its slowest rate, date, or destination, by phone or online. Simply go to the official website, after selecting what you want to change regarding your reservation, you will be looking for new flights. Here, you will get information about the variation in fare and if you need to pay the modification fee. Register with your joint account · Manage your reservation · Choose whether you are on the move or not. Make your choice and get a confirmation. United Airlines' flight modification policy prohibits changes to basic economy tickets, although they are made at round-the-clock intervals.