Whether travel miles are transferable depends on if you mean transferring between people or between airlines. Most major airlines (like American, Delta, and United) allow you to transfer miles to another person’s account, but they charge a hefty fee—often around 1 cent per mile plus a processing fee—which usually makes it a poor financial decision. It is almost always better to just book a flight for someone else using your own miles. Regarding transferring between airlines, this is generally not possible unless the airlines are in a formal alliance (like Oneworld or Star Alliance), and even then, you usually "earn" on one and "redeem" on the other rather than moving the points. However, miles are highly transferable from credit card programs (like Chase Sapphire, Amex Gold, or Capital One) to various airline partners. In 2026, these "transferable points" are the gold standard of travel hacking, as they allow you to move your points to whichever airline offers the best award value for your specific trip.