Yes, almost all major airline loyalty programs in 2026 allow you to use your miles to book a flight for someone else, including your spouse. You simply log into your account and enter her legal name as the passenger during the checkout process. However, some Asian carriers like Japan Airlines (JAL) or Korean Air require you to pre-register family members in your account before booking. It is important to distinguish between booking a flight with miles (usually free) and transferring miles to another account, which almost always incurs a hefty fee. For 2026 travelers, the most cost-effective method is to keep the miles in your account and book the ticket directly in her name.