Do Alaska airlines miles expire? Mileage Plan miles do not expire as long as the qualified account is active at least once per 24 months. Qualifying account activity includes earning or redeeming points on Alaska Airlines or one of its partners, such as using the Alaska Airlines credit card, flying with Alaska Airlines, or making a purchase from one of its partners. This feature provides Mileage Plan participants with flexibility and peace of mind by allowing them to continue collecting miles without fear of expiration. Furthermore, the Mileage Plan program offers a range of options to earn and redeem miles, including flights, car rentals, hotel stays, and more, making it an effective reward program for frequent travelers.