Securing an upgrade on United Airlines in 2026 is a multi-tiered process that prioritizes loyalty status and instrument-based requests. The most common method is through Premier Status (Silver, Gold, Platinum, and 1K); these members are automatically added to the "Complementary Inventory" list for domestic and select regional flights, with the window for clearance opening between 24 and 96 hours before departure. If you do not have status, you can use MileagePlus Miles plus a "Co-pay" (usually $75–$500) to request an upgrade to United First or Polaris. For those with higher status, PlusPoints are the primary currency for international upgrades. Another "pro tip" for 2026 is the "Buy-up" offer; United often displays discounted cash upgrade prices in their app during the 24-hour check-in window. These can sometimes be as low as $99 for a short-haul flight, which is often cheaper than the original fare difference. Finally, "Expert Mode" on the United website allows you to see the specific "fare buckets" (like PZ or JN) that indicate whether upgrade space is actually available for immediate confirmation, helping you choose flights where your chances are statistically highest.