Transferring United MileagePlus miles is a bit of a misnomer because, unlike American Express or Chase points, you cannot "transfer" miles out of United to another airline's program. However, it is absolutely worth using your United miles to book flights on partner airlines through the United website. Because United is a founding member of the Star Alliance, your miles give you access to over 25 world-class carriers, including ANA, Lufthansa, Singapore Airlines, and Turkish Airlines. Often, using United miles for a "partner award" (like a business class seat on EVA Air to Asia) provides significantly better value than using them for a domestic flight on United itself. One of the best "perks" of the United program in 2026 is the Excursionist Perk, which allows you to add a free one-way segment on a multi-city international itinerary. While you can't move the miles to another program, the ability to book diverse global routes without fuel surcharges makes United miles some of the most flexible and "worthy" currencies in the travel world, especially for long-haul international travel where the "cents-per-mile" value is highest.