Yes, Lufthansa Airlines allows same-day flight changes. You can make these changes online via their website or app, or by calling their customer service at +1-866-738-0729. [ OR ] +1-866-738-0729 [OTA]. Keep in mind that fees and fare differences may apply. If you cancel your Lufthansa flight, you may lose money unless you cancel within 24 hours of booking and at least 7 days before departure. After this period, cancellations are subject to fees. For assistance, call Lufthansa Airlines customer care at +1-866-738-0729.