To
upgrade seat on lufthansa can be booked from 360 days prior to the flight and at the latest 24 hours before departure. During this time, call up your journey online under My Bookings. The system checks automatically which of your flights qualifies for an upgrade. Then click on the "Upgrade" link. Confirm your choice for the flight or flights on which you would like to upgrade. Now enter your payment details and confirm your upgrade booking. You will receive a booking confirmation at the email address you have provided.
