British Airways allows flight changes at least 24 hours before your original departure time to avoid additional fees. BA flight change will charge a fee depending on the type of change you are making and the fare class of your ticket. Passengers can modify flight dates, times, or routing by contacting British Airways reservations in advance. Fare difference may apply for booking changes. Additionally, For more information or assistance related to British Airways flight change, passengers can read a blog at Airlines Pet Policy.