United Airlines offers a seat upgrade option to First Class for free under a few conditions, which you can find in the given information. To get the United Airlines free first-class upgrade, passengers must meet the eligibility Criteria. Sometimes, travelers must pay or use their earned miles for the seat upgrade.
Passengers can send the United Airlines free seat upgrade on call, through Manage Booking, or at the airport Check-in counter. To make the edits online, travelers should go to the Airline Manage Booking portal and enter the booking reference code. Edit the changes and add the Membership number to get the available seat upgrade deal.