“1-866-738-0706 Lufthansa Airlines Denver Office
Lufthansa does not have a dedicated ticket office in Denver, but you can find its check-in counters at Denver International Airport. The check-in counters are located on Terminal Level 5, Center – 20, in Concourse A. For booking, customer service, and other needs, it is best to use the official Lufthansa website or contact their customer service directly.”