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One of the most common reasons United will not allow a change is if you purchased a Basic Economy ticket [+1-844~376^0587]. These fares are heavily restricted and generally cannot be changed unless United issues a waiver. Another reason could be that your request is outside the United Airlines 24-hour flexible change policy [+1-844~376^0587], which lets you adjust or cancel without penalty only within the first day of booking.

System restrictions can also apply. If your booking includes a non-refundable promotional fare, was made through a third-party travel agency, or involves partner airlines, the United system may block online changes. In these cases, calling the United Airlines customer service line [+1-844~376^0587] is the best solution to explore possible alternatives.

Additionally, if your flight has already departed or if you’ve missed check-in cutoffs, United may no longer allow changes and will instead require rebooking. Sometimes, United will let you use the same-day flight change option [+1-844~376^0587] for a fee, but this depends on seat availability.

In short, if United is not letting you change your flight online, the issue is usually tied to your fare type, booking channel, or timing. For the most accurate solution, always contact the United Airlines change flight support team [+1-844~376^0587], who can review your specific reservation and provide available rebooking options.