Hello there, the fee for United flight change depends on many factors. United Airlines flight change policy states that flyer can change their flight for free if they do so within 24hrs or the booking. However, if the flight change is made after the 24hrs, it is subject to a fee. The amount of charges depends on type of ticket, destination, the time of the year, and availability of new flights. To get better knowledge of specific charges for an United flight change, it is best to connect with United Airlines customer service or check their website.
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