Klm Middle Name:- Whatever the reason, KLM airlines understands that plans must be altered from time to time. You may do so if your KLM flight date is suitable for change and your ticket meets the KLM flight date change policy or standards. Call KLM customer service at +1-877-805-0998 for more information on KLM flight changes. If you want to change your KLM flight date online, we'll show you how to change your departure time, destination, and travel date.