Yes, Turkish Airlines Miles&Smiles miles do expire, but the policy is relatively generous compared to some competitors. Miles are valid for 3 full calendar years from the date they were earned. For example, any miles earned at any point in 2023 will expire on December 31, 2026. Turkish Airlines does not allow you to "reset" the clock simply by having activity in your account (like United or Southwest do); once a mile reaches its three-year limit, it is gone regardless of whether you have recently flown. However, there is a "safety valve" for those who aren't ready to book a trip: you can pay a fee of $20 USD for every 1,000 miles you wish to extend. This extension lasts for an additional three years. Because of this "hard" expiration date, it is highly recommended to use your miles for award tickets, seat upgrades, or even "Miles&Smiles" shopping vouchers before the year-end deadline. Elite and Elite Plus members often have higher priorities for award seats, making it easier for them to "burn" their miles before they vanish.