Yes, Capital One miles are designed for maximum flexibility, allowing you to use them for travel on virtually any airline in two primary ways. First, you can book any flight through the Capital One Travel portal, where your miles act as a form of "cash" at a rate of 1 cent per mile. This method has no blackout dates—if a seat is for sale, you can buy it with miles. Second, for potentially higher value, you can transfer your miles to over 15 airline loyalty programs, including British Airways, Air Canada Aeroplan, and Singapore Airlines KrisFlyer. Most of these transfers are at a 1:1 ratio. This allows you to book flights on partner airlines across all major alliances (oneworld, Star Alliance, and SkyTeam). If you prefer not to use the portal, you can also use the "Purchase Eraser" feature to pay for a flight on any airline website with your card and then "erase" the charge from your statement using miles within 90 days of the purchase.