Steps to change your Iberia flight online:
You need to go to the official web portal of the airline and log in with your account details.
You must log in with the regular account you used to make the reservation.
Then, you have to go to the “Manage My Booking” option.
Let me show you my ticket. Open it.
After that, you will see many choices at the top of the screen.
You will see a “Change Flight” option. Click on it.
Then quickly enter the new date and replacement details for your airline and click the Submit button when done. You will then need to select your seat from the seat map and click on submit.
After that, you will be asked to pay the difference between your old and new flight dates.
After making the payment, your travel itinerary will be displayed on the screen.
Bring your files or print outs.
You can view new tickets by further managing your reservation options.
Now, after reading the steps, you should be clear on how Iberia changes your flight date.