Within the Lufthansa Miles & More program, award miles are generally valid for 36 months from the date they were earned. If they are not redeemed, they expire at the end of the subsequent quarter. For example, if you earned miles on February 10, 2026, they would expire on March 31, 2029. However, there are two primary ways to protect your miles from expiring: holding Frequent Flyer Status (Frequent Traveller, Senator, or HON Circle) or possessing a co-branded Miles & More Credit Card. As long as you maintain your status or use your credit card at least once a month for a purchase, your miles will remain valid indefinitely. If you lose your status, the 36-month "countdown" begins again for all miles currently in your account. Lufthansa typically provides a summary of expiring miles in your online account statement and via their monthly newsletter, giving you at least two months' notice before any balance is forfeited, allowing you time to book a flight or use them for a hotel stay.