https://sites.google.com/view/unitedairlineschangeflights Yes, if your aims change and you prefer not to change your itinerary immediately, you may cancel the reservation and then return to it later to make flight changes for up to one year from the date of issue. A change fee may apply. Changes must be made before your original scheduled united flight. When the original ticketed fare class is available on the requested flight within 24 hours of departure, the same-day flight change fee (instead of the change fee mentioned in the fare rules) will apply.