In 2026, being upgraded to United First on a domestic flight within the United States generally does not grant you access to the United Club lounges. United Airlines maintains a strict policy where domestic first-class tickets (including those obtained via complimentary or paid upgrades) are excluded from lounge benefits unless the flight is part of a "Premium Transcontinental" route (such as New York/Newark to Los Angeles or San Francisco). However, if you are upgraded to United Polaris or United Business on an international flight, lounge access is typically included. Access is also granted if you have a standalone United Club membership, a one-time pass, or Star Alliance Gold status while traveling on an international itinerary. For most travelers who receive a domestic upgrade, the "lounge experience" remains a separate purchase. It is always wise to check the "United Club" section of the United app after your upgrade is confirmed, as it will explicitly state if your specific boarding pass has been "unlocked" for entry based on your route or secondary membership status.