United Airlines is offering MileagePlus cardholders the opportunity to earn bonus miles through a credit card promotion. The promotion is valid for purchases made between October 1 and December 31, 2024. Cardholders can select from three spending tiers to earn either miles or PQPs, with registration required by December 15, 2024. Upgraded Points adds that this deal ends in a week, so act fast to take advantage of this mileage boost opportunity. This exclusive offer provides a great way for MileagePlus cardholders to enhance their rewards and maximize their travel benefits.