United Airlines boarding groups are a structured sequence used to organize the flow of passengers onto the aircraft to minimize gate congestion and speed up departures. In 2026, United uses six primary groups. Pre-boarding is reserved for unaccompanied minors, customers with disabilities, active-duty military, and United Global Services members. Group 1 includes Premier Platinum and Gold members, as well as Star Alliance Gold. Group 2 is for Premier Silver members, those with certain United credit cards (like the Quest or Explorer), and those who purchased "Premier Access." Groups 3 through 5 are based on seat location; United recently reintroduced the "WILMA" (Window-Middle-Aisle) method, where Group 3 consists of window seats, Group 4 is middle seats, and Group 5 is aisle seats. This method is statistically proven to be the fastest way to board. Finally, Group 6 (if applicable) is typically reserved for Basic Economy passengers on certain aircraft. Understanding your group is essential, as United agents are generally strict about enforcing the order to ensure that overhead bin space is distributed fairly according to ticket class and loyalty status.