How to change your KLM flight?
Are you having trouble changing your KLM flight? Don't worry! KLM offers multiple ways to change your flight, you can complete the KLM Flight Change process by using the Manage Trip option on their official website and mobile app.
Steps to change KLM flight through the official website:
Browse to the KLM official website and go to the 'My Trip' section
Now login to your account using the KLM credentials or the booking details
Provide the booking code and surname, and click on 'search.'
Select the itinerary you want to change, and click on 'Edit Reservation.'
Select the new date for your trip, and make other required modifications
You can save the changes and pay for the change fee and fare difference
Follow the ongoing commands, and when the changes are done, you will get a confirmation email soon.
Passengers can also contact KLM customer service to easily change their flight.

Read more:- https://www.airflyreservations.com/blog/klm-flight-change-policy