You can change your flight date on KLM by going to the "Manage your booking" section of the KLM website. Once there, you can select the flight that you want to change, and then choose the "KLM Change flight" option.
You will then be prompted to enter your booking reference number and last name to verify your booking. After verifying your booking, you will be able to view the available flight options and select the new date that you would like to travel on.
You can also contact KLM customer service and ask them to change the flight date for you. You will be able to talk to them over the phone, Email or Live Chat. They will assist you with the flight change and answer any question you might have.
Please note that changing a flight can sometimes result in additional charges, depending on the fare rules of your original booking and the new flight that you select. And also you should also check the cancellation and refund policy before making any changes.
Read also:- Jetblue Change Flight