Yes, United Airlines MileagePlus miles are highly versatile and can be used for international travel to over 1,000 destinations worldwide. This is made possible through United's membership in the Star Alliance, the world's largest airline network. You can redeem your miles not only for flights on United-operated aircraft to major hubs like Tokyo, London, and Paris but also on partner carriers such as Lufthansa, ANA, Singapore Airlines, and Turkish Airlines. United uses a "dynamic pricing" model for its own flights, meaning the mileage cost fluctuates with demand, but partner awards often follow a more predictable "saver" chart. Beyond just the ticket cost, miles can be used for international cabin upgrades, such as moving from Economy to United Polaris® business class. One unique benefit for international travelers is the "Excursionist Perk," which allows you to add a free one-way segment within a single region (like traveling within Europe) when booking a multi-city international award trip. This makes United miles one of the most powerful tools for complex, multi-country itineraries.