- Sign in to your MileagePlus account and pull up your existing reservation to request the upgrade online.
- Call United Reservations at 1-800-UNITED-1 (1-800-864-8331) or your designated Premier service line.
- Once you’re within 24 hours of departure, you can make your request at the check-in counter or at the gate with a United representative.
You’ll then be placed on a waitlist that will be cleared as upgrades become available. Learn more