Yes, almost all major airlines in 2026 allow you to purchase frequent flyer miles directly through their websites, often managed by third-party platforms like Points.com. While this is a convenient way to "top up" your balance for a specific award flight, it is generally considered a poor financial value unless there is a significant buy miles promotion (often offering 50% to 100% bonuses). For example, United MileagePlus and American AAdvantage frequently sell miles for roughly 2.5 to 3.5 cents each, while the actual redemption value is often closer to 1.2 to 1.5 cents. Purchasing miles is most effective when you are a few thousand short of a high-value Business or First Class ticket, or if you are trying to extend the expiration date of your existing balance. Additionally, you can "purchase" miles indirectly through credit card sign-up bonuses or by transferring points from flexible programs like Amex Membership Rewards or Chase Ultimate Rewards, which is typically a much more cost-effective strategy than buying them outright.