You can speak to British Airways customer service directly to make any changes to the booking. Extra charges might be applicable when you change the booking over the phone. The above process you can follow for booking you made directly from a website or authorized sources. For third-party booking, you can make the changes by calling the travel agent directly.
Source : https://www.travomart.co.uk/blog/how-do-i-change-my-british-airways-flight-date
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