The phone number for the KLM service center in the United States is 866-434-0320. The company website also provides a electronic contact form for those who wish to email them, but the email address is not listed.
KLM.com's contact section includes contact information for various countries and is organized by type of inquiry. For example, those who wish to contact the airline about special assistance should click on the link labeled Special Assistance, and then scroll down to the middle of the page, and select the relevant country and city. The website then directs the user to the best telephone number for the region.