Is it possible to change the British Airways flight date?

Yes, you can change the flight date per the airline's requirements. Indeed, under the British Airways flight change policy, you can change the date of the flight within 24 hours of making the reservation, and no change fee will be levied on you.

How do I change the flight date of British Airways?

The best way to change the flight date for British Airways would be through the official website. The steps for the same are:

Skim over the landing page of British Airways.
Browse to find the Manage icon at the top end.
Under the My Bookings icon, enter the credentials as asked.
The booking page would get retrieved as per the requirement.
Find the flight for which the change needs to be made.
Click on the change my flight link is given.
Choose the alternative flight option, make payment, and submit.
The team will share a confirmation email.

What charges do I have to pay for flight change on British Airways?

The average charge for changing a flight with British Airways depends entirely on the fare class chosen, the destination selected, and the total distance travelled. So, an average change fee of 30 USD to 80 USD can be charged, and it can vary depending on the scenario under which you have requested the flight change.